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<h2 id="graph-algorithms--analytics-in-geode" class="position-relative d-flex align-items-center group">
<span>Graph Algorithms &amp; Analytics in Geode</span>
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</script><p>Graph algorithms unlock powerful analytical capabilities in Geode, enabling you to extract insights from connected data that would be impossible with traditional relational queries. From finding shortest paths and detecting communities to ranking influential nodes and identifying anomalies, graph algorithms are essential tools for modern data science and analytics.</p>
<p>Geode provides optimized implementations of classic and advanced graph algorithms, all accessible through GQL queries. These algorithms leverage Geode’s native graph storage and parallel processing capabilities to deliver high performance even on massive graphs with billions of nodes and relationships.</p>
<p>This comprehensive guide explores essential graph algorithms, their mathematical foundations, complexity analysis, implementation patterns, and optimization strategies for production deployments.</p>
<h3 id="theoretical-foundations" class="position-relative d-flex align-items-center group">
<span>Theoretical Foundations</span>
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<h4 id="graph-complexity-classes" class="position-relative d-flex align-items-center group">
<span>Graph Complexity Classes</span>
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</h4><p>Understanding algorithmic complexity is crucial for choosing the right algorithm for your data size:</p>
<p><strong>Polynomial Time (P)</strong>:</p>
<ul>
<li>Single-source shortest path: O(V + E) with BFS, O((V + E) log V) with Dijkstra</li>
<li>Minimum spanning tree: O(E log V) with Kruskal’s, O(E + V log V) with Prim’s</li>
<li>PageRank (fixed iterations): O(k × E) where k is iteration count</li>
<li>Strongly connected components: O(V + E) with Tarjan’s algorithm</li>
</ul>
<p><strong>NP-Complete (Intractable)</strong>:</p>
<ul>
<li>Hamiltonian path/cycle: O(2^V × V^2)</li>
<li>Graph coloring: O(k^V) where k is number of colors</li>
<li>Traveling salesman problem (TSP): O(V! / 2)</li>
<li>Maximum clique: O(3^(V/3))</li>
</ul>
<p><strong>Approximation Algorithms</strong> (when exact solutions are impractical):</p>
<ul>
<li>Community detection: Modularity optimization O(V × E)</li>
<li>Betweenness centrality sampling: O(k × V × E) where k « V</li>
<li>Graph partitioning: Spectral methods O(V^3)</li>
</ul>
<h4 id="graph-properties-and-invariants" class="position-relative d-flex align-items-center group">
<span>Graph Properties and Invariants</span>
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</h4><p><strong>Degree Distribution</strong>: Characterizes network topology</p>
<ul>
<li>Regular graphs: All nodes have same degree</li>
<li>Scale-free networks: Power-law degree distribution P(k) ~ k^(-γ)</li>
<li>Small-world networks: High clustering, short average path length</li>
</ul>
<p><strong>Clustering Coefficient</strong>: Measures local density</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">C(v) = 2 × |{(u,w) : u,w ∈ N(v) ∧ (u,w) ∈ E}| / (deg(v) × (deg(v) - 1))
</span></span></code></pre></div><p><strong>Graph Diameter</strong>: Maximum shortest path between any two nodes
<strong>Graph Density</strong>: Ratio of actual edges to possible edges = E / (V × (V-1) / 2)</p>
<h3 id="pathfinding-algorithms" class="position-relative d-flex align-items-center group">
<span>Pathfinding Algorithms</span>
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</h3><p><strong>Shortest Path (Dijkstra)</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Find</span><span class="w"> </span><span class="py">shortest</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="py">between</span><span class="w"> </span><span class="py">two</span><span class="w"> </span><span class="py">nodes</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">shortestPath</span><span class="p">(</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="p">(</span><span class="py">start</span><span class="p">:</span><span class="nc">Location</span><span class="w"> </span><span class="p">{</span><span class="py">name</span><span class="p">:</span><span class="w"> </span><span class="err">'</span><span class="nc">New</span><span class="w"> </span><span class="py">York</span><span class="err">'</span><span class="p">})</span><span class="err">-</span><span class="p">[:</span><span class="nc">ROUTE</span><span class="err">*</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">end</span><span class="p">:</span><span class="nc">Location</span><span class="w"> </span><span class="p">{</span><span class="py">name</span><span class="p">:</span><span class="w"> </span><span class="err">'</span><span class="nc">Los</span><span class="w"> </span><span class="py">Angeles</span><span class="err">'</span><span class="p">})</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">path</span><span class="p">,</span><span class="w"> </span><span class="py">length</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">hops</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Weighted</span><span class="w"> </span><span class="py">shortest</span><span class="w"> </span><span class="py">path</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">shortestPath</span><span class="p">(</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="p">(</span><span class="py">start</span><span class="p">:</span><span class="nc">Location</span><span class="w"> </span><span class="p">{</span><span class="py">name</span><span class="p">:</span><span class="w"> </span><span class="err">'</span><span class="nc">New</span><span class="w"> </span><span class="py">York</span><span class="err">'</span><span class="p">})</span><span class="err">-</span><span class="p">[</span><span class="py">r</span><span class="p">:</span><span class="nc">ROUTE</span><span class="err">*</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">end</span><span class="p">:</span><span class="nc">Location</span><span class="w"> </span><span class="p">{</span><span class="py">name</span><span class="p">:</span><span class="w"> </span><span class="err">'</span><span class="nc">Los</span><span class="w"> </span><span class="py">Angeles</span><span class="err">'</span><span class="p">})</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">path</span><span class="p">,</span><span class="w"> </span><span class="py">reduce</span><span class="p">(</span><span class="py">dist</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">0</span><span class="p">,</span><span class="w"> </span><span class="py">rel</span><span class="w"> </span><span class="py">in</span><span class="w"> </span><span class="py">relationships</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="py">dist</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="py">rel</span><span class="err">.</span><span class="py">distance</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">total_distance</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>All Shortest Paths</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Find</span><span class="w"> </span><span class="py">all</span><span class="w"> </span><span class="py">shortest</span><span class="w"> </span><span class="py">paths</span><span class="w"> </span><span class="p">(</span><span class="py">when</span><span class="w"> </span><span class="py">multiple</span><span class="w"> </span><span class="py">exist</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">paths</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">allShortestPaths</span><span class="p">(</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="p">(</span><span class="py">a</span><span class="p">:</span><span class="nc">Person</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nc">123</span><span class="p">})</span><span class="err">-</span><span class="p">[:</span><span class="nc">KNOWS</span><span class="err">*</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">b</span><span class="p">:</span><span class="nc">Person</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nc">456</span><span class="p">})</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">paths</span><span class="p">,</span><span class="w"> </span><span class="py">length</span><span class="p">(</span><span class="py">paths</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">path_length</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>K-Shortest Paths</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Find</span><span class="w"> </span><span class="py">top</span><span class="w"> </span><span class="py">K</span><span class="w"> </span><span class="py">shortest</span><span class="w"> </span><span class="py">paths</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="py">start</span><span class="p">:</span><span class="nc">City</span><span class="w"> </span><span class="p">{</span><span class="py">name</span><span class="p">:</span><span class="w"> </span><span class="err">'</span><span class="nc">Boston</span><span class="err">'</span><span class="p">})</span><span class="err">-</span><span class="p">[:</span><span class="nc">CONNECTED</span><span class="err">*</span><span class="py">1</span><span class="err">.</span><span class="mf">.10</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">end</span><span class="p">:</span><span class="nc">City</span><span class="w"> </span><span class="p">{</span><span class="py">name</span><span class="p">:</span><span class="w"> </span><span class="err">'</span><span class="nc">Seattle</span><span class="err">'</span><span class="p">})</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">path</span><span class="p">,</span><span class="w"> </span><span class="py">reduce</span><span class="p">(</span><span class="py">cost</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">0</span><span class="p">,</span><span class="w"> </span><span class="py">r</span><span class="w"> </span><span class="py">in</span><span class="w"> </span><span class="py">relationships</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="py">cost</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">weight</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">total_cost</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">total_cost</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">LIMIT</span><span class="w"> </span><span class="py">5</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">path</span><span class="p">,</span><span class="w"> </span><span class="py">total_cost</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h3 id="centrality-algorithms" class="position-relative d-flex align-items-center group">
<span>Centrality Algorithms</span>
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</h3><p><strong>Degree Centrality</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Calculate</span><span class="w"> </span><span class="py">in</span><span class="err">-</span><span class="py">degree</span><span class="w"> </span><span class="p">(</span><span class="py">followers</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">OPTIONAL</span><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">)</span><span class="err"><-</span><span class="p">[:</span><span class="nc">FOLLOWS</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">follower</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">follower</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">in_degree</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">in_degree</span><span class="w"> </span><span class="py">DESC</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">LIMIT</span><span class="w"> </span><span class="py">10</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Out</span><span class="err">-</span><span class="py">degree</span><span class="w"> </span><span class="p">(</span><span class="py">following</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">OPTIONAL</span><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">FOLLOWS</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">following</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">following</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">out_degree</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">out_degree</span><span class="w"> </span><span class="py">DESC</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Total</span><span class="w"> </span><span class="py">degree</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">OPTIONAL</span><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">KNOWS</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">connected</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">DISTINCT</span><span class="w"> </span><span class="py">connected</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">degree</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">degree</span><span class="w"> </span><span class="py">DESC</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Betweenness Centrality</strong> (nodes on shortest paths):</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Simplified</span><span class="w"> </span><span class="py">betweenness</span><span class="w"> </span><span class="py">calculation</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Person</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">shortestPath</span><span class="p">((</span><span class="py">a</span><span class="p">:</span><span class="nc">Person</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">KNOWS</span><span class="err">*</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">b</span><span class="p">:</span><span class="nc">Person</span><span class="p">))</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">n</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">nodes</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="py">AND</span><span class="w"> </span><span class="py">a</span><span class="w"> </span><span class="err"><></span><span class="w"> </span><span class="py">n</span><span class="w"> </span><span class="py">AND</span><span class="w"> </span><span class="py">b</span><span class="w"> </span><span class="err"><></span><span class="w"> </span><span class="py">n</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">n</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">paths_through</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w"> </span><span class="py">paths_through</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">paths_through</span><span class="w"> </span><span class="py">DESC</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">LIMIT</span><span class="w"> </span><span class="py">10</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Closeness Centrality</strong> (average distance to others):</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Measure</span><span class="w"> </span><span class="py">how</span><span class="w"> </span><span class="py">close</span><span class="w"> </span><span class="py">a</span><span class="w"> </span><span class="py">node</span><span class="w"> </span><span class="py">is</span><span class="w"> </span><span class="py">to</span><span class="w"> </span><span class="py">all</span><span class="w"> </span><span class="py">others</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">User</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nc">123</span><span class="p">})</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">shortestPath</span><span class="p">((</span><span class="py">u</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">KNOWS</span><span class="err">*</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">other</span><span class="p">:</span><span class="nc">User</span><span class="p">))</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">other</span><span class="w"> </span><span class="err"><></span><span class="w"> </span><span class="py">u</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">u</span><span class="p">,</span><span class="w"> </span><span class="py">avg</span><span class="p">(</span><span class="py">length</span><span class="p">(</span><span class="py">path</span><span class="p">))</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">avg_distance</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w"> </span><span class="py">1</span><span class="mf">.0</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">avg_distance</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">closeness_centrality</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h3 id="pagerank-and-influence" class="position-relative d-flex align-items-center group">
<span>PageRank and Influence</span>
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</h3><p><strong>Basic PageRank Implementation</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Simplified</span><span class="w"> </span><span class="py">PageRank</span><span class="err">-</span><span class="py">style</span><span class="w"> </span><span class="py">scoring</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="err"><-</span><span class="p">[:</span><span class="nc">FOLLOWS</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">follower</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">u</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">follower</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">direct_followers</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">follower</span><span class="p">)</span><span class="err"><-</span><span class="p">[:</span><span class="nc">FOLLOWS</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">indirect</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">direct_followers</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">DISTINCT</span><span class="w"> </span><span class="py">indirect</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">indirect_reach</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">direct_followers</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="py">1</span><span class="mf">.0</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">DISTINCT</span><span class="w"> </span><span class="py">indirect</span><span class="p">)</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="py">0</span><span class="mf">.15</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">influence_score</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">influence_score</span><span class="w"> </span><span class="py">DESC</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Weighted Influence</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Account</span><span class="w"> </span><span class="py">for</span><span class="w"> </span><span class="py">follower</span><span class="w"> </span><span class="py">quality</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="err"><-</span><span class="p">[</span><span class="py">f</span><span class="p">:</span><span class="nc">FOLLOWS</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">follower</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">OPTIONAL</span><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">follower</span><span class="p">)</span><span class="err"><-</span><span class="p">[:</span><span class="nc">FOLLOWS</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">follower_of_follower</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">u</span><span class="p">,</span><span class="w"> </span><span class="py">follower</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">follower_of_follower</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">follower_influence</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">sum</span><span class="p">(</span><span class="py">follower_influence</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">weighted_influence</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">weighted_influence</span><span class="w"> </span><span class="py">DESC</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h3 id="community-detection" class="position-relative d-flex align-items-center group">
<span>Community Detection</span>
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</h3><p><strong>Connected Components</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Find</span><span class="w"> </span><span class="py">connected</span><span class="w"> </span><span class="py">components</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">start</span><span class="p">:</span><span class="nc">User</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nc">123</span><span class="p">})</span><span class="err">-</span><span class="p">[:</span><span class="nc">KNOWS</span><span class="err">*</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">connected</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">collect</span><span class="p">(</span><span class="py">DISTINCT</span><span class="w"> </span><span class="py">connected</span><span class="err">.</span><span class="py">id</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">community_members</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">DISTINCT</span><span class="w"> </span><span class="py">connected</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">community_size</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Triangle Counting</strong> (clustered communities):</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Count</span><span class="w"> </span><span class="py">triangles</span><span class="w"> </span><span class="p">(</span><span class="py">A</span><span class="w"> </span><span class="py">knows</span><span class="w"> </span><span class="py">B</span><span class="p">,</span><span class="w"> </span><span class="py">B</span><span class="w"> </span><span class="py">knows</span><span class="w"> </span><span class="py">C</span><span class="p">,</span><span class="w"> </span><span class="py">C</span><span class="w"> </span><span class="py">knows</span><span class="w"> </span><span class="py">A</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">a</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">KNOWS</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">b</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">KNOWS</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">c</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">KNOWS</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">a</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="err">*</span><span class="p">)</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">3</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">triangle_count</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Local</span><span class="w"> </span><span class="py">clustering</span><span class="w"> </span><span class="py">coefficient</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">User</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nc">123</span><span class="p">})</span><span class="err">-</span><span class="p">[:</span><span class="nc">KNOWS</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">neighbor</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">u</span><span class="p">,</span><span class="w"> </span><span class="py">collect</span><span class="p">(</span><span class="py">DISTINCT</span><span class="w"> </span><span class="py">neighbor</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">neighbors</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">DISTINCT</span><span class="w"> </span><span class="py">neighbor</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">degree</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">UNWIND</span><span class="w"> </span><span class="py">neighbors</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">n1</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">UNWIND</span><span class="w"> </span><span class="py">neighbors</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">n2</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n1</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">r</span><span class="p">:</span><span class="nc">KNOWS</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">n2</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">n1</span><span class="w"> </span><span class="err"><></span><span class="w"> </span><span class="py">n2</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">u</span><span class="p">,</span><span class="w"> </span><span class="py">degree</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">DISTINCT</span><span class="w"> </span><span class="py">r</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">connected_pairs</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">degree</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">connected_pairs</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="py">2</span><span class="mf">.0</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="p">(</span><span class="py">degree</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="p">(</span><span class="py">degree</span><span class="w"> </span><span class="err">-</span><span class="w"> </span><span class="py">1</span><span class="p">))</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">clustering_coefficient</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Label Propagation</strong> (community discovery):</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Simplified</span><span class="w"> </span><span class="py">label</span><span class="w"> </span><span class="py">propagation</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">KNOWS</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">neighbor</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">u</span><span class="p">,</span><span class="w"> </span><span class="py">neighbor</span><span class="err">.</span><span class="py">community_id</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">neighbor_community</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="err">*</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">freq</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">freq</span><span class="w"> </span><span class="py">DESC</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">LIMIT</span><span class="w"> </span><span class="py">1</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">SET</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">community_id</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">neighbor_community</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">community_id</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h3 id="similarity-and-recommendations" class="position-relative d-flex align-items-center group">
<span>Similarity and Recommendations</span>
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</h3><p><strong>Jaccard Similarity</strong> (common connections):</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Find</span><span class="w"> </span><span class="py">similar</span><span class="w"> </span><span class="py">users</span><span class="w"> </span><span class="py">by</span><span class="w"> </span><span class="py">shared</span><span class="w"> </span><span class="py">connections</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u1</span><span class="p">:</span><span class="nc">User</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nc">123</span><span class="p">})</span><span class="err">-</span><span class="p">[:</span><span class="nc">FOLLOWS</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">common</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="err"><-</span><span class="p">[:</span><span class="nc">FOLLOWS</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">u2</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">u1</span><span class="w"> </span><span class="err"><></span><span class="w"> </span><span class="py">u2</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">u1</span><span class="p">,</span><span class="w"> </span><span class="py">u2</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">DISTINCT</span><span class="w"> </span><span class="py">common</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">common_count</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u1</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">FOLLOWS</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">u1_following</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u2</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">FOLLOWS</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">u2_following</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">u1</span><span class="p">,</span><span class="w"> </span><span class="py">u2</span><span class="p">,</span><span class="w"> </span><span class="py">common_count</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">DISTINCT</span><span class="w"> </span><span class="py">u1_following</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">u1_total</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">DISTINCT</span><span class="w"> </span><span class="py">u2_following</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">u2_total</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">u2</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">common_count</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="py">1</span><span class="mf">.0</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="p">(</span><span class="py">u1_total</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="py">u2_total</span><span class="w"> </span><span class="err">-</span><span class="w"> </span><span class="py">common_count</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">jaccard_similarity</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">jaccard_similarity</span><span class="w"> </span><span class="py">DESC</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">LIMIT</span><span class="w"> </span><span class="py">10</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Collaborative Filtering</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Recommend</span><span class="w"> </span><span class="py">products</span><span class="w"> </span><span class="py">based</span><span class="w"> </span><span class="kd">on</span><span class="w"> </span><span class="py">similar</span><span class="w"> </span><span class="py">users</span><span class="err">'</span><span class="w"> </span><span class="py">purchases</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">User</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nc">123</span><span class="p">})</span><span class="err">-</span><span class="p">[:</span><span class="nc">PURCHASED</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">p</span><span class="p">:</span><span class="nc">Product</span><span class="p">)</span><span class="err"><-</span><span class="p">[:</span><span class="nc">PURCHASED</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">similar</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">similar</span><span class="w"> </span><span class="err"><></span><span class="w"> </span><span class="py">u</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">similar</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">DISTINCT</span><span class="w"> </span><span class="py">p</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">common_purchases</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">common_purchases</span><span class="w"> </span><span class="py">DESC</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">LIMIT</span><span class="w"> </span><span class="py">50</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">similar</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">PURCHASED</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">recommendation</span><span class="p">:</span><span class="nc">Product</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">NOT</span><span class="w"> </span><span class="py">EXISTS</span><span class="w"> </span><span class="p">{(</span><span class="py">u</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">PURCHASED</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">recommendation</span><span class="p">)}</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">recommendation</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="err">*</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">recommendation_score</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">recommendation_score</span><span class="w"> </span><span class="py">DESC</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">LIMIT</span><span class="w"> </span><span class="py">10</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Cosine Similarity</strong> (vector-based):</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Compare</span><span class="w"> </span><span class="py">users</span><span class="w"> </span><span class="py">by</span><span class="w"> </span><span class="py">behavior</span><span class="w"> </span><span class="py">vectors</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u1</span><span class="p">:</span><span class="nc">User</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nc">123</span><span class="p">})</span><span class="err">-</span><span class="p">[</span><span class="py">r1</span><span class="p">:</span><span class="nc">RATED</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">item</span><span class="p">:</span><span class="nc">Product</span><span class="p">)</span><span class="err"><-</span><span class="p">[</span><span class="py">r2</span><span class="p">:</span><span class="nc">RATED</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">u2</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">u1</span><span class="w"> </span><span class="err"><></span><span class="w"> </span><span class="py">u2</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">u1</span><span class="p">,</span><span class="w"> </span><span class="py">u2</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">sum</span><span class="p">(</span><span class="py">r1</span><span class="err">.</span><span class="py">rating</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="py">r2</span><span class="err">.</span><span class="py">rating</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">dot_product</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">sqrt</span><span class="p">(</span><span class="py">sum</span><span class="p">(</span><span class="py">r1</span><span class="err">.</span><span class="py">rating</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="py">r1</span><span class="err">.</span><span class="py">rating</span><span class="p">))</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">u1_magnitude</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">sqrt</span><span class="p">(</span><span class="py">sum</span><span class="p">(</span><span class="py">r2</span><span class="err">.</span><span class="py">rating</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="py">r2</span><span class="err">.</span><span class="py">rating</span><span class="p">))</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">u2_magnitude</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">u2</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">dot_product</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="p">(</span><span class="py">u1_magnitude</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="py">u2_magnitude</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">cosine_similarity</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">cosine_similarity</span><span class="w"> </span><span class="py">DESC</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h3 id="graph-traversal-algorithms" class="position-relative d-flex align-items-center group">
<span>Graph Traversal Algorithms</span>
<button type="button"
class="h-share btn btn-link p-0 text-decoration-none link-secondary opacity-50 hover-opacity-100 transition-all ms-1"
data-share-target="graph-traversal-algorithms"
aria-haspopup="dialog"
aria-label="Share link: Graph Traversal Algorithms">
<i class="fa-sharp-duotone fa-solid fa-share-nodes" aria-hidden="true" style="font-size: 0.8em;"></i>
<span class="visually-hidden">Share link</span>
</button>
</h3><p><strong>Breadth-First Search (BFS)</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Explore</span><span class="w"> </span><span class="py">network</span><span class="w"> </span><span class="py">level</span><span class="w"> </span><span class="py">by</span><span class="w"> </span><span class="py">level</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="py">start</span><span class="p">:</span><span class="nc">User</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nc">123</span><span class="p">})</span><span class="err">-</span><span class="p">[:</span><span class="nc">KNOWS</span><span class="err">*</span><span class="py">1</span><span class="err">.</span><span class="mf">.4</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">connected</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">connected</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w"> </span><span class="py">length</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">distance</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">distance</span><span class="p">,</span><span class="w"> </span><span class="py">connected</span><span class="err">.</span><span class="py">name</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Depth-First Search (DFS)</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Deep</span><span class="w"> </span><span class="py">exploration</span><span class="w"> </span><span class="py">of</span><span class="w"> </span><span class="py">paths</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="py">start</span><span class="p">:</span><span class="nc">User</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nc">123</span><span class="p">})</span><span class="err">-</span><span class="p">[:</span><span class="nc">FOLLOWS</span><span class="err">*</span><span class="py">1</span><span class="err">.</span><span class="mf">.5</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">reached</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">DISTINCT</span><span class="w"> </span><span class="py">reached</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w"> </span><span class="py">length</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">depth</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">depth</span><span class="w"> </span><span class="py">DESC</span><span class="p">,</span><span class="w"> </span><span class="py">reached</span><span class="err">.</span><span class="py">name</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Cycle Detection</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Find</span><span class="w"> </span><span class="py">cycles</span><span class="w"> </span><span class="py">in</span><span class="w"> </span><span class="py">the</span><span class="w"> </span><span class="py">graph</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">CONNECTS</span><span class="err">*</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">n</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">length</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="err">></span><span class="w"> </span><span class="py">1</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">path</span><span class="p">,</span><span class="w"> </span><span class="py">length</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">cycle_length</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">cycle_length</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">LIMIT</span><span class="w"> </span><span class="py">10</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h3 id="flow-and-optimization" class="position-relative d-flex align-items-center group">
<span>Flow and Optimization</span>
<button type="button"
class="h-share btn btn-link p-0 text-decoration-none link-secondary opacity-50 hover-opacity-100 transition-all ms-1"
data-share-target="flow-and-optimization"
aria-haspopup="dialog"
aria-label="Share link: Flow and Optimization">
<i class="fa-sharp-duotone fa-solid fa-share-nodes" aria-hidden="true" style="font-size: 0.8em;"></i>
<span class="visually-hidden">Share link</span>
</button>
</h3><p><strong>Maximum Flow</strong> (network capacity):</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Simplified</span><span class="w"> </span><span class="py">max</span><span class="w"> </span><span class="py">flow</span><span class="w"> </span><span class="py">calculation</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="py">source</span><span class="p">:</span><span class="nc">Node</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="err">'</span><span class="nc">A</span><span class="err">'</span><span class="p">})</span><span class="err">-</span><span class="p">[</span><span class="py">r</span><span class="p">:</span><span class="nc">PIPE</span><span class="err">*</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">sink</span><span class="p">:</span><span class="nc">Node</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="err">'</span><span class="nc">B</span><span class="err">'</span><span class="p">})</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">path</span><span class="p">,</span><span class="w"> </span><span class="py">reduce</span><span class="p">(</span><span class="py">flow</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">999999</span><span class="p">,</span><span class="w"> </span><span class="py">rel</span><span class="w"> </span><span class="py">in</span><span class="w"> </span><span class="py">relationships</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="p">|</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">CASE</span><span class="w"> </span><span class="py">WHEN</span><span class="w"> </span><span class="py">rel</span><span class="err">.</span><span class="py">capacity</span><span class="w"> </span><span class="err"><</span><span class="w"> </span><span class="py">flow</span><span class="w"> </span><span class="py">THEN</span><span class="w"> </span><span class="py">rel</span><span class="err">.</span><span class="py">capacity</span><span class="w"> </span><span class="py">ELSE</span><span class="w"> </span><span class="py">flow</span><span class="w"> </span><span class="py">END</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">path_capacity</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">path</span><span class="p">,</span><span class="w"> </span><span class="py">path_capacity</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">path_capacity</span><span class="w"> </span><span class="py">DESC</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Minimum Spanning Tree</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Connect</span><span class="w"> </span><span class="py">all</span><span class="w"> </span><span class="py">nodes</span><span class="w"> </span><span class="py">with</span><span class="w"> </span><span class="py">minimum</span><span class="w"> </span><span class="py">total</span><span class="w"> </span><span class="py">edge</span><span class="w"> </span><span class="py">weight</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Location</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">collect</span><span class="p">(</span><span class="py">n</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">nodes</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="py">a</span><span class="p">:</span><span class="nc">Location</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">r</span><span class="p">:</span><span class="nc">ROAD</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">b</span><span class="p">:</span><span class="nc">Location</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">a</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">nodes</span><span class="w"> </span><span class="py">AND</span><span class="w"> </span><span class="py">b</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">nodes</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">path</span><span class="p">,</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">distance</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">weight</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">weight</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h3 id="anomaly-detection" class="position-relative d-flex align-items-center group">
<span>Anomaly Detection</span>
<button type="button"
class="h-share btn btn-link p-0 text-decoration-none link-secondary opacity-50 hover-opacity-100 transition-all ms-1"
data-share-target="anomaly-detection"
aria-haspopup="dialog"
aria-label="Share link: Anomaly Detection">
<i class="fa-sharp-duotone fa-solid fa-share-nodes" aria-hidden="true" style="font-size: 0.8em;"></i>
<span class="visually-hidden">Share link</span>
</button>
</h3><p><strong>Unusual Pattern Detection</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Find</span><span class="w"> </span><span class="py">users</span><span class="w"> </span><span class="py">with</span><span class="w"> </span><span class="py">anomalous</span><span class="w"> </span><span class="py">behavior</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">OPTIONAL</span><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">PURCHASED</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">p</span><span class="p">:</span><span class="nc">Product</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">u</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">p</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">purchase_count</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">avg</span><span class="p">(</span><span class="py">p</span><span class="err">.</span><span class="py">price</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">avg_spend</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">avg</span><span class="p">(</span><span class="py">purchase_count</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">avg_purchases</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">stddev</span><span class="p">(</span><span class="py">purchase_count</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">stddev_purchases</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">avg</span><span class="p">(</span><span class="py">avg_spend</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">global_avg_spend</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">stddev</span><span class="p">(</span><span class="py">avg_spend</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">stddev_spend</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">OPTIONAL</span><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">PURCHASED</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">p</span><span class="p">:</span><span class="nc">Product</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">u</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">p</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">user_purchases</span><span class="p">,</span><span class="w"> </span><span class="py">avg</span><span class="p">(</span><span class="py">p</span><span class="err">.</span><span class="py">price</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">user_avg_spend</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">avg_purchases</span><span class="p">,</span><span class="w"> </span><span class="py">stddev_purchases</span><span class="p">,</span><span class="w"> </span><span class="py">global_avg_spend</span><span class="p">,</span><span class="w"> </span><span class="py">stddev_spend</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">abs</span><span class="p">(</span><span class="py">user_purchases</span><span class="w"> </span><span class="err">-</span><span class="w"> </span><span class="py">avg_purchases</span><span class="p">)</span><span class="w"> </span><span class="err">></span><span class="w"> </span><span class="py">3</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="py">stddev_purchases</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">OR</span><span class="w"> </span><span class="py">abs</span><span class="p">(</span><span class="py">user_avg_spend</span><span class="w"> </span><span class="err">-</span><span class="w"> </span><span class="py">global_avg_spend</span><span class="p">)</span><span class="w"> </span><span class="err">></span><span class="w"> </span><span class="py">3</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="py">stddev_spend</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w"> </span><span class="py">user_purchases</span><span class="p">,</span><span class="w"> </span><span class="py">user_avg_spend</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Fraud Ring Detection</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Identify</span><span class="w"> </span><span class="py">tightly</span><span class="w"> </span><span class="py">connected</span><span class="w"> </span><span class="py">suspicious</span><span class="w"> </span><span class="py">accounts</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">suspect</span><span class="p">:</span><span class="nc">Account</span><span class="w"> </span><span class="p">{</span><span class="py">flagged</span><span class="p">:</span><span class="w"> </span><span class="nc">true</span><span class="p">})</span><span class="err">-</span><span class="p">[:</span><span class="nc">TRANSACTED_WITH</span><span class="err">*</span><span class="py">1</span><span class="err">.</span><span class="mf">.2</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">connected</span><span class="p">:</span><span class="nc">Account</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">suspect</span><span class="p">,</span><span class="w"> </span><span class="py">collect</span><span class="p">(</span><span class="py">DISTINCT</span><span class="w"> </span><span class="py">connected</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">ring_members</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">size</span><span class="p">(</span><span class="py">ring_members</span><span class="p">)</span><span class="w"> </span><span class="err">></span><span class="w"> </span><span class="py">5</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">m1</span><span class="p">:</span><span class="nc">Account</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">TRANSACTED_WITH</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">m2</span><span class="p">:</span><span class="nc">Account</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">m1</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">ring_members</span><span class="w"> </span><span class="py">AND</span><span class="w"> </span><span class="py">m2</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">ring_members</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">suspect</span><span class="err">.</span><span class="py">id</span><span class="p">,</span><span class="w"> </span><span class="py">ring_members</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="err">*</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">internal_transactions</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">internal_transactions</span><span class="w"> </span><span class="py">DESC</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h3 id="graph-metrics-and-statistics" class="position-relative d-flex align-items-center group">
<span>Graph Metrics and Statistics</span>
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</h3><p><strong>Diameter</strong> (longest shortest path):</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Calculate</span><span class="w"> </span><span class="py">graph</span><span class="w"> </span><span class="py">diameter</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">shortestPath</span><span class="p">((</span><span class="py">a</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="err">*</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">b</span><span class="p">:</span><span class="nc">Node</span><span class="p">))</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">a</span><span class="w"> </span><span class="err"><</span><span class="w"> </span><span class="py">b</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">max</span><span class="p">(</span><span class="py">length</span><span class="p">(</span><span class="py">path</span><span class="p">))</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">diameter</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Density</strong> (edge to node ratio):</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Calculate</span><span class="w"> </span><span class="py">graph</span><span class="w"> </span><span class="py">density</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">n</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">node_count</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">()</span><span class="err">-</span><span class="p">[</span><span class="py">r</span><span class="p">:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-</span><span class="p">()</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">r</span><span class="p">)</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="py">1</span><span class="mf">.0</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="p">(</span><span class="py">node_count</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="p">(</span><span class="py">node_count</span><span class="w"> </span><span class="err">-</span><span class="w"> </span><span class="py">1</span><span class="p">))</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">density</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Degree Distribution</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Analyze</span><span class="w"> </span><span class="py">degree</span><span class="w"> </span><span class="py">distribution</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">OPTIONAL</span><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">r</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">m</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">n</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">r</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">degree</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">degree</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">n</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">node_count</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">degree</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h3 id="performance-optimization-for-algorithms" class="position-relative d-flex align-items-center group">
<span>Performance Optimization for Algorithms</span>
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</h3><p><strong>Limit Traversal Depth</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Always</span><span class="w"> </span><span class="py">bound</span><span class="w"> </span><span class="py">variable</span><span class="err">-</span><span class="py">length</span><span class="w"> </span><span class="py">patterns</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="py">a</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="err">*</span><span class="py">1</span><span class="err">.</span><span class="mf">.6</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">b</span><span class="p">)</span><span class="w"> </span><span class="err">--</span><span class="w"> </span><span class="py">Good</span><span class="p">:</span><span class="w"> </span><span class="nc">bounded</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="py">a</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="err">*</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">b</span><span class="p">)</span><span class="w"> </span><span class="err">--</span><span class="w"> </span><span class="py">Bad</span><span class="p">:</span><span class="w"> </span><span class="nc">unbounded</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">path</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Use Early Filtering</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Filter</span><span class="w"> </span><span class="py">before</span><span class="w"> </span><span class="py">expensive</span><span class="w"> </span><span class="py">traversals</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">start</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">start</span><span class="err">.</span><span class="py">active</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">true</span><span class="w"> </span><span class="err">--</span><span class="w"> </span><span class="py">Filter</span><span class="w"> </span><span class="py">first</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">AND</span><span class="w"> </span><span class="py">start</span><span class="err">.</span><span class="py">country</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="err">'</span><span class="py">US</span><span class="err">'</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="py">start</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">KNOWS</span><span class="err">*</span><span class="py">1</span><span class="err">.</span><span class="mf">.3</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">connected</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">path</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Leverage Indexes</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Start</span><span class="w"> </span><span class="py">with</span><span class="w"> </span><span class="py">indexed</span><span class="w"> </span><span class="py">lookups</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">CREATE</span><span class="w"> </span><span class="py">INDEX</span><span class="w"> </span><span class="py">user_id</span><span class="w"> </span><span class="py">ON</span><span class="w"> </span><span class="p">:</span><span class="nc">User</span><span class="p">(</span><span class="py">id</span><span class="p">)</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">User</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nc">123</span><span class="p">})</span><span class="w"> </span><span class="err">--</span><span class="w"> </span><span class="py">Uses</span><span class="w"> </span><span class="py">index</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">FOLLOWS</span><span class="err">*</span><span class="py">1</span><span class="err">.</span><span class="mf">.4</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">reached</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">path</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Parallel Processing</strong>:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Break</span><span class="w"> </span><span class="py">large</span><span class="w"> </span><span class="py">computations</span><span class="w"> </span><span class="py">into</span><span class="w"> </span><span class="py">batches</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">id</span><span class="w"> </span><span class="err">></span><span class="p">=</span><span class="w"> </span><span class="py">0</span><span class="w"> </span><span class="py">AND</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">id</span><span class="w"> </span><span class="err"><</span><span class="w"> </span><span class="py">1000</span><span class="w"> </span><span class="err">--</span><span class="w"> </span><span class="py">Batch</span><span class="w"> </span><span class="py">1</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">u</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">KNOWS</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">friend</span><span class="p">:</span><span class="nc">User</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">id</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">(</span><span class="py">friend</span><span class="p">)</span><span class="w"> </span><span class="py">as</span><span class="w"> </span><span class="py">degree</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h3 id="use-cases-by-industry" class="position-relative d-flex align-items-center group">
<span>Use Cases by Industry</span>
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</h3><p><strong>Social Networks</strong>: Influence ranking, friend recommendations, community detection</p>
<p><strong>Fraud Detection</strong>: Ring identification, anomaly detection, pattern analysis</p>
<p><strong>Supply Chain</strong>: Shortest paths, bottleneck identification, flow optimization</p>
<p><strong>Recommendation Engines</strong>: Collaborative filtering, similarity scoring, personalization</p>
<p><strong>Network Security</strong>: Intrusion path analysis, vulnerability assessment, access patterns</p>
<p><strong>Biology</strong>: Protein interaction analysis, pathway discovery, disease networks</p>
<h3 id="best-practices" class="position-relative d-flex align-items-center group">
<span>Best Practices</span>
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</h3><ol>
<li><strong>Always bound variable-length paths</strong> to prevent explosions</li>
<li><strong>Use appropriate indexes</strong> for algorithm starting points</li>
<li><strong>Consider graph density</strong> when choosing algorithms</li>
<li><strong>Profile algorithm performance</strong> on representative data</li>
<li><strong>Implement incremental updates</strong> for frequently computed metrics</li>
<li><strong>Cache results</strong> for expensive computations</li>
<li><strong>Use sampling</strong> for approximate results on huge graphs</li>
<li><strong>Parallelize</strong> independent computations across nodes</li>
<li><strong>Monitor memory usage</strong> for large traversals</li>
<li><strong>Validate results</strong> on known test cases</li>
</ol>
<h3 id="related-topics" class="position-relative d-flex align-items-center group">
<span>Related Topics</span>
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</h3><ul>
<li><a
href="/tags/patterns/"
>Query Patterns</a>
</li>
<li><a
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>Performance Optimization</a>
</li>
<li><a
href="/tags/pagerank/"
>PageRank Algorithm</a>
</li>
<li><a
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>Community Detection</a>
</li>
<li><a
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>Pattern Matching</a>
</li>
<li><a
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>Analytics and ML</a>
</li>
</ul>
<h3 id="advanced-algorithm-implementations" class="position-relative d-flex align-items-center group">
<span>Advanced Algorithm Implementations</span>
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</h3>
<h4 id="all-pairs-shortest-paths-floyd-warshall" class="position-relative d-flex align-items-center group">
<span>All-Pairs Shortest Paths (Floyd-Warshall)</span>
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</h4><p>Compute distances between all node pairs for dense graphs:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Initialize</span><span class="w"> </span><span class="py">distance</span><span class="w"> </span><span class="py">matrix</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">source</span><span class="p">:</span><span class="nc">Node</span><span class="p">),</span><span class="w"> </span><span class="p">(</span><span class="py">target</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">source</span><span class="w"> </span><span class="err"><></span><span class="w"> </span><span class="py">target</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MERGE</span><span class="w"> </span><span class="p">(</span><span class="py">source</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">d</span><span class="p">:</span><span class="nc">DISTANCE</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">target</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">SET</span><span class="w"> </span><span class="py">d</span><span class="err">.</span><span class="py">distance</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">CASE</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WHEN</span><span class="w"> </span><span class="py">EXISTS</span><span class="p">((</span><span class="py">source</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">CONNECTED</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">target</span><span class="p">))</span><span class="w"> </span><span class="py">THEN</span><span class="w"> </span><span class="py">1</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">ELSE</span><span class="w"> </span><span class="py">999999</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">END</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Floyd</span><span class="err">-</span><span class="py">Warshall</span><span class="w"> </span><span class="py">iterations</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">i</span><span class="p">:</span><span class="nc">Node</span><span class="p">),</span><span class="w"> </span><span class="p">(</span><span class="py">j</span><span class="p">:</span><span class="nc">Node</span><span class="p">),</span><span class="w"> </span><span class="p">(</span><span class="py">k</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">i</span><span class="w"> </span><span class="err"><></span><span class="w"> </span><span class="py">j</span><span class="w"> </span><span class="py">AND</span><span class="w"> </span><span class="py">j</span><span class="w"> </span><span class="err"><></span><span class="w"> </span><span class="py">k</span><span class="w"> </span><span class="py">AND</span><span class="w"> </span><span class="py">i</span><span class="w"> </span><span class="err"><></span><span class="w"> </span><span class="py">k</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">i</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">ij</span><span class="p">:</span><span class="nc">DISTANCE</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">j</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">i</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">ik</span><span class="p">:</span><span class="nc">DISTANCE</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">k</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">k</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">kj</span><span class="p">:</span><span class="nc">DISTANCE</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">j</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">i</span><span class="p">,</span><span class="w"> </span><span class="py">j</span><span class="p">,</span><span class="w"> </span><span class="py">ij</span><span class="p">,</span><span class="w"> </span><span class="py">ik</span><span class="err">.</span><span class="py">distance</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="py">kj</span><span class="err">.</span><span class="py">distance</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">new_distance</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">new_distance</span><span class="w"> </span><span class="err"><</span><span class="w"> </span><span class="py">ij</span><span class="err">.</span><span class="py">distance</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">SET</span><span class="w"> </span><span class="py">ij</span><span class="err">.</span><span class="py">distance</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">new_distance</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Query</span><span class="w"> </span><span class="py">all</span><span class="err">-</span><span class="py">pairs</span><span class="w"> </span><span class="py">distances</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">a</span><span class="p">:</span><span class="nc">Node</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nv">$node_a</span><span class="p">})</span><span class="err">-</span><span class="p">[</span><span class="nc">d</span><span class="p">:</span><span class="nc">DISTANCE</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">b</span><span class="p">:</span><span class="nc">Node</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nv">$node_b</span><span class="p">})</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="nc">RETURN</span><span class="w"> </span><span class="py">a</span><span class="err">.</span><span class="py">id</span><span class="p">,</span><span class="w"> </span><span class="py">b</span><span class="err">.</span><span class="py">id</span><span class="p">,</span><span class="w"> </span><span class="py">d</span><span class="err">.</span><span class="py">distance</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">shortest_distance</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Complexity</strong>: O(V³), suitable for V < 1000
<strong>Memory</strong>: O(V²) for distance matrix
<strong>Use case</strong>: Dense graphs, transitive closure, diameter calculation</p>
<h4 id="bellman-ford-algorithm-negative-weights" class="position-relative d-flex align-items-center group">
<span>Bellman-Ford Algorithm (Negative Weights)</span>
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</h4><p>Handle graphs with negative edge weights:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Initialize</span><span class="w"> </span><span class="py">distances</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">SET</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">distance</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">CASE</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WHEN</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">id</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="nv">$source_id</span><span class="w"> </span><span class="py">THEN</span><span class="w"> </span><span class="py">0</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">ELSE</span><span class="w"> </span><span class="py">999999</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">END</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Relax</span><span class="w"> </span><span class="py">edges</span><span class="w"> </span><span class="py">V</span><span class="err">-</span><span class="py">1</span><span class="w"> </span><span class="py">times</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">r</span><span class="p">:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">v</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">distance</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">weight</span><span class="w"> </span><span class="err"><</span><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="py">distance</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">SET</span><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="py">distance</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">distance</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">weight</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="py">predecessor</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">id</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Detect</span><span class="w"> </span><span class="py">negative</span><span class="w"> </span><span class="py">cycles</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">r</span><span class="p">:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">v</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">distance</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">weight</span><span class="w"> </span><span class="err"><</span><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="py">distance</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="err">'</span><span class="py">Negative</span><span class="w"> </span><span class="py">cycle</span><span class="w"> </span><span class="py">detected</span><span class="err">'</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">warning</span><span class="p">,</span><span class="w"> </span><span class="py">u</span><span class="err">.</span><span class="py">id</span><span class="p">,</span><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="py">id</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Extract</span><span class="w"> </span><span class="py">shortest</span><span class="w"> </span><span class="py">path</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">target</span><span class="p">:</span><span class="nc">Node</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nv">$target_id</span><span class="p">})</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="nc">WITH</span><span class="w"> </span><span class="py">target</span><span class="err">.</span><span class="py">id</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">current_id</span><span class="p">,</span><span class="w"> </span><span class="p">[]</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">path</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">CALL</span><span class="w"> </span><span class="p">{</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WITH</span><span class="w"> </span><span class="py">current_id</span><span class="p">,</span><span class="w"> </span><span class="py">path</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nc">current_id</span><span class="p">})</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WHERE</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">predecessor</span><span class="w"> </span><span class="py">IS</span><span class="w"> </span><span class="py">NOT</span><span class="w"> </span><span class="py">NULL</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WITH</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">predecessor</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">pred</span><span class="p">,</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="p">[</span><span class="py">current_id</span><span class="p">]</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">new_path</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">RETURN</span><span class="w"> </span><span class="py">pred</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">next_id</span><span class="p">,</span><span class="w"> </span><span class="py">new_path</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">result_path</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="p">}</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">result_path</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">shortest_path</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Complexity</strong>: O(V × E)
<strong>Advantages</strong>: Handles negative weights, detects negative cycles
<strong>Use case</strong>: Currency arbitrage, price optimization</p>
<h4 id="tarjans-strongly-connected-components" class="position-relative d-flex align-items-center group">
<span>Tarjan&rsquo;s Strongly Connected Components</span>
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</h4><p>Find strongly connected components in O(V + E) time:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Initialize</span><span class="w"> </span><span class="py">node</span><span class="w"> </span><span class="py">state</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">SET</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">index</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">null</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">lowlink</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">null</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="kd">on</span><span class="py">_stack</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">false</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Recursive</span><span class="w"> </span><span class="py">DFS</span><span class="w"> </span><span class="py">for</span><span class="w"> </span><span class="py">SCC</span><span class="w"> </span><span class="py">detection</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">v</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="py">index</span><span class="w"> </span><span class="py">IS</span><span class="w"> </span><span class="py">NULL</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">CALL</span><span class="w"> </span><span class="p">{</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WITH</span><span class="w"> </span><span class="py">v</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">SET</span><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="py">index</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="nv">$current_index</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="py">lowlink</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="nv">$current_index</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="kd">on</span><span class="py">_stack</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">true</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WITH</span><span class="w"> </span><span class="py">v</span><span class="p">,</span><span class="w"> </span><span class="nv">$current_index</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="py">1</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">next_index</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">v</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">w</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">CALL</span><span class="w"> </span><span class="p">{</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WITH</span><span class="w"> </span><span class="py">w</span><span class="p">,</span><span class="w"> </span><span class="py">next_index</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">CASE</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WHEN</span><span class="w"> </span><span class="py">w</span><span class="err">.</span><span class="py">index</span><span class="w"> </span><span class="py">IS</span><span class="w"> </span><span class="py">NULL</span><span class="w"> </span><span class="py">THEN</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="err">//</span><span class="w"> </span><span class="py">Recurse</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">SET</span><span class="w"> </span><span class="py">w</span><span class="err">.</span><span class="py">index</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">next_index</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WHEN</span><span class="w"> </span><span class="py">w</span><span class="err">.</span><span class="kd">on</span><span class="py">_stack</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">true</span><span class="w"> </span><span class="py">THEN</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="err">//</span><span class="w"> </span><span class="py">Update</span><span class="w"> </span><span class="py">lowlink</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">SET</span><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="py">lowlink</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">CASE</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WHEN</span><span class="w"> </span><span class="py">w</span><span class="err">.</span><span class="py">index</span><span class="w"> </span><span class="err"><</span><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="py">lowlink</span><span class="w"> </span><span class="py">THEN</span><span class="w"> </span><span class="py">w</span><span class="err">.</span><span class="py">index</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">ELSE</span><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="py">lowlink</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">END</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">END</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="p">}</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="err">//</span><span class="w"> </span><span class="py">If</span><span class="w"> </span><span class="py">v</span><span class="w"> </span><span class="py">is</span><span class="w"> </span><span class="py">root</span><span class="w"> </span><span class="py">of</span><span class="w"> </span><span class="py">SCC</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WITH</span><span class="w"> </span><span class="py">v</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WHERE</span><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="py">lowlink</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="py">index</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">w</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WHERE</span><span class="w"> </span><span class="py">w</span><span class="err">.</span><span class="kd">on</span><span class="py">_stack</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">true</span><span class="w"> </span><span class="py">AND</span><span class="w"> </span><span class="py">w</span><span class="err">.</span><span class="py">index</span><span class="w"> </span><span class="err">></span><span class="p">=</span><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="py">index</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">SET</span><span class="w"> </span><span class="py">w</span><span class="err">.</span><span class="py">component_id</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="py">id</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">w</span><span class="err">.</span><span class="kd">on</span><span class="py">_stack</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">false</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">RETURN</span><span class="w"> </span><span class="py">v</span><span class="err">.</span><span class="py">id</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">scc_root</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="p">}</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Query</span><span class="w"> </span><span class="py">component</span><span class="w"> </span><span class="py">membership</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">component_id</span><span class="w"> </span><span class="py">IS</span><span class="w"> </span><span class="py">NOT</span><span class="w"> </span><span class="py">NULL</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">component_id</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">component</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">COUNT</span><span class="p">(</span><span class="py">n</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">size</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">COLLECT</span><span class="p">(</span><span class="py">n</span><span class="err">.</span><span class="py">id</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">members</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">size</span><span class="w"> </span><span class="py">DESC</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Applications</strong>: Web crawling, social network analysis, compiler optimization</p>
<h4 id="edmonds-karp-maximum-flow" class="position-relative d-flex align-items-center group">
<span>Edmonds-Karp Maximum Flow</span>
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</h4><p>Compute maximum flow from source to sink:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Initialize</span><span class="w"> </span><span class="py">residual</span><span class="w"> </span><span class="py">graph</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">e</span><span class="p">:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">v</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MERGE</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">forward</span><span class="p">:</span><span class="nc">RESIDUAL</span><span class="w"> </span><span class="p">{</span><span class="py">capacity</span><span class="p">:</span><span class="w"> </span><span class="nc">e</span><span class="err">.</span><span class="py">capacity</span><span class="p">,</span><span class="w"> </span><span class="py">flow</span><span class="p">:</span><span class="w"> </span><span class="nc">0</span><span class="p">}]</span><span class="err">-></span><span class="p">(</span><span class="py">v</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MERGE</span><span class="w"> </span><span class="p">(</span><span class="py">v</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">backward</span><span class="p">:</span><span class="nc">RESIDUAL</span><span class="w"> </span><span class="p">{</span><span class="py">capacity</span><span class="p">:</span><span class="w"> </span><span class="nc">0</span><span class="p">,</span><span class="w"> </span><span class="py">flow</span><span class="p">:</span><span class="w"> </span><span class="nc">0</span><span class="p">}]</span><span class="err">-></span><span class="p">(</span><span class="py">u</span><span class="p">)</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Augmenting</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="py">search</span><span class="w"> </span><span class="p">(</span><span class="py">BFS</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="nv">$source_id</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">source</span><span class="p">,</span><span class="w"> </span><span class="nv">$sink_id</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">sink</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">shortestPath</span><span class="p">((</span><span class="py">s</span><span class="p">:</span><span class="nc">Node</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nc">source</span><span class="p">})</span><span class="err">-</span><span class="p">[:</span><span class="nc">RESIDUAL</span><span class="err">*</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">t</span><span class="p">:</span><span class="nc">Node</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nc">sink</span><span class="p">}))</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">ALL</span><span class="p">(</span><span class="py">r</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">relationships</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="py">WHERE</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">capacity</span><span class="w"> </span><span class="err">-</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">flow</span><span class="w"> </span><span class="err">></span><span class="w"> </span><span class="py">0</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">path</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">REDUCE</span><span class="p">(</span><span class="py">min_cap</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">999999</span><span class="p">,</span><span class="w"> </span><span class="py">r</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">relationships</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="p">|</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">CASE</span><span class="w"> </span><span class="py">WHEN</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">capacity</span><span class="w"> </span><span class="err">-</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">flow</span><span class="w"> </span><span class="err"><</span><span class="w"> </span><span class="py">min_cap</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">THEN</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">capacity</span><span class="w"> </span><span class="err">-</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">flow</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">ELSE</span><span class="w"> </span><span class="py">min_cap</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">END</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">bottleneck</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">path</span><span class="p">,</span><span class="w"> </span><span class="py">bottleneck</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">UNWIND</span><span class="w"> </span><span class="py">relationships</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">edge</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">SET</span><span class="w"> </span><span class="py">edge</span><span class="err">.</span><span class="py">flow</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">edge</span><span class="err">.</span><span class="py">flow</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="py">bottleneck</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">path</span><span class="p">,</span><span class="w"> </span><span class="py">bottleneck</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">forward</span><span class="p">:</span><span class="nc">RESIDUAL</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">v</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">forward</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">relationships</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">v</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">backward</span><span class="p">:</span><span class="nc">RESIDUAL</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">u</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">SET</span><span class="w"> </span><span class="py">backward</span><span class="err">.</span><span class="py">capacity</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">backward</span><span class="err">.</span><span class="py">capacity</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="py">bottleneck</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Extract</span><span class="w"> </span><span class="py">max</span><span class="w"> </span><span class="py">flow</span><span class="w"> </span><span class="py">value</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(:</span><span class="nc">Node</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nv">$source_id</span><span class="p">})</span><span class="err">-</span><span class="p">[</span><span class="nc">r</span><span class="p">:</span><span class="nc">RESIDUAL</span><span class="p">]</span><span class="err">-></span><span class="p">()</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">SUM</span><span class="p">(</span><span class="py">r</span><span class="err">.</span><span class="py">flow</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">max_flow_value</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Complexity</strong>: O(V × E²)
<strong>Applications</strong>: Network capacity, bipartite matching, airline scheduling</p>
<h3 id="production-scale-optimizations" class="position-relative d-flex align-items-center group">
<span>Production-Scale Optimizations</span>
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</h3>
<h4 id="parallel-algorithm-execution" class="position-relative d-flex align-items-center group">
<span>Parallel Algorithm Execution</span>
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</h4><p>Leverage Geode’s parallel processing for large graphs:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Parallel</span><span class="w"> </span><span class="py">PageRank</span><span class="w"> </span><span class="py">with</span><span class="w"> </span><span class="py">batch</span><span class="w"> </span><span class="py">updates</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">COUNT</span><span class="p">(</span><span class="py">n</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">total_nodes</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">SET</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">pagerank</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">1</span><span class="mf">.0</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">total_nodes</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Process</span><span class="w"> </span><span class="py">in</span><span class="w"> </span><span class="py">parallel</span><span class="w"> </span><span class="py">batches</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">n</span><span class="p">,</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">id</span><span class="w"> </span><span class="err">%</span><span class="w"> </span><span class="py">10</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">partition_id</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">CALL</span><span class="w"> </span><span class="p">{</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WITH</span><span class="w"> </span><span class="py">n</span><span class="p">,</span><span class="w"> </span><span class="py">partition_id</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">neighbor</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WITH</span><span class="w"> </span><span class="py">neighbor</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">SUM</span><span class="p">(</span><span class="py">n</span><span class="err">.</span><span class="py">pagerank</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">COUNT</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-></span><span class="p">()</span><span class="w"> </span><span class="p">})</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">incoming_rank</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">SET</span><span class="w"> </span><span class="py">neighbor</span><span class="err">.</span><span class="py">pagerank_new</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">0</span><span class="mf">.15</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="py">0</span><span class="mf">.85</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="py">incoming_rank</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="p">}</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">TRANSACTIONS</span><span class="w"> </span><span class="py">OF</span><span class="w"> </span><span class="py">100000</span><span class="w"> </span><span class="py">ROWS</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">PER</span><span class="w"> </span><span class="py">PARTITION</span><span class="w"> </span><span class="p">(</span><span class="py">partition_id</span><span class="p">)</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Parallel</span><span class="w"> </span><span class="py">strongly</span><span class="err">-</span><span class="py">connected</span><span class="w"> </span><span class="py">component</span><span class="w"> </span><span class="py">detection</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">CALL</span><span class="w"> </span><span class="p">{</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WITH</span><span class="w"> </span><span class="py">n</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">EDGE</span><span class="err">*</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">n</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WITH</span><span class="w"> </span><span class="py">n</span><span class="p">,</span><span class="w"> </span><span class="py">COLLECT</span><span class="p">(</span><span class="py">DISTINCT</span><span class="w"> </span><span class="p">[</span><span class="py">node</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">nodes</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="py">ID</span><span class="p">(</span><span class="py">node</span><span class="p">)])</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">cycles</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">SET</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">scc_candidates</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">cycles</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="p">}</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">TRANSACTIONS</span><span class="w"> </span><span class="py">OF</span><span class="w"> </span><span class="py">10000</span><span class="w"> </span><span class="py">ROWS</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h4 id="sampling-and-approximation" class="position-relative d-flex align-items-center group">
<span>Sampling and Approximation</span>
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</h4><p>Achieve faster results with approximate algorithms:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Approximate</span><span class="w"> </span><span class="py">betweenness</span><span class="w"> </span><span class="py">centrality</span><span class="w"> </span><span class="p">(</span><span class="py">sample</span><span class="err">-</span><span class="py">based</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">100</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">sample_size</span><span class="w"> </span><span class="err">//</span><span class="w"> </span><span class="py">Sample</span><span class="w"> </span><span class="py">100</span><span class="w"> </span><span class="py">random</span><span class="w"> </span><span class="py">nodes</span><span class="w"> </span><span class="py">instead</span><span class="w"> </span><span class="py">of</span><span class="w"> </span><span class="py">all</span><span class="w"> </span><span class="py">pairs</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">sample</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">sample</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">rand</span><span class="p">()</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">LIMIT</span><span class="w"> </span><span class="nv">$sample_size</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">shortestPath</span><span class="p">((</span><span class="py">sample</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">EDGE</span><span class="err">*</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">target</span><span class="p">:</span><span class="nc">Node</span><span class="p">))</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">sample</span><span class="w"> </span><span class="err"><></span><span class="w"> </span><span class="py">target</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">nodes</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">path_nodes</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">UNWIND</span><span class="w"> </span><span class="py">path_nodes</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">node</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">node</span><span class="w"> </span><span class="err"><></span><span class="w"> </span><span class="py">path_nodes</span><span class="p">[</span><span class="py">0</span><span class="p">]</span><span class="w"> </span><span class="py">AND</span><span class="w"> </span><span class="py">node</span><span class="w"> </span><span class="err"><></span><span class="w"> </span><span class="py">path_nodes</span><span class="p">[</span><span class="err">-</span><span class="py">1</span><span class="p">]</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">node</span><span class="p">,</span><span class="w"> </span><span class="py">COUNT</span><span class="p">(</span><span class="err">*</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">sampled_betweenness</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">node</span><span class="err">.</span><span class="py">id</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">sampled_betweenness</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="p">(</span><span class="nv">$total_nodes</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="nv">$sample_size</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">estimated_betweenness</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">estimated_betweenness</span><span class="w"> </span><span class="py">DESC</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div><p><strong>Accuracy</strong>: ~95% correlation with exact values at 10× speedup</p>
<h4 id="incremental-algorithm-updates" class="position-relative d-flex align-items-center group">
<span>Incremental Algorithm Updates</span>
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</h4><p>Update algorithm results without full recomputation:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Incremental</span><span class="w"> </span><span class="py">PageRank</span><span class="w"> </span><span class="py">after</span><span class="w"> </span><span class="py">edge</span><span class="w"> </span><span class="py">addition</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">:</span><span class="nc">Node</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nv">$new_source</span><span class="p">}),</span><span class="w"> </span><span class="p">(</span><span class="nc">v</span><span class="p">:</span><span class="nc">Node</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nv">$new_target</span><span class="p">})</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="nc">MERGE</span><span class="w"> </span><span class="p">(</span><span class="py">u</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">v</span><span class="p">)</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Localized</span><span class="w"> </span><span class="py">update</span><span class="w"> </span><span class="p">(</span><span class="py">affected</span><span class="w"> </span><span class="py">nodes</span><span class="w"> </span><span class="kd">on</span><span class="py">ly</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">affected</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">affected</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="p">[</span><span class="py">u</span><span class="p">,</span><span class="w"> </span><span class="py">v</span><span class="p">]</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">OR</span><span class="w"> </span><span class="py">EXISTS</span><span class="p">((</span><span class="py">affected</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">EDGE</span><span class="err">*</span><span class="py">1</span><span class="err">.</span><span class="mf">.2</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">u</span><span class="p">))</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">OR</span><span class="w"> </span><span class="py">EXISTS</span><span class="p">((</span><span class="py">affected</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">EDGE</span><span class="err">*</span><span class="py">1</span><span class="err">.</span><span class="mf">.2</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">v</span><span class="p">))</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">affected</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">affected</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">neighbor</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">neighbor</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">SUM</span><span class="p">(</span><span class="py">affected</span><span class="err">.</span><span class="py">pagerank</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">COUNT</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="p">(</span><span class="py">affected</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-></span><span class="p">()</span><span class="w"> </span><span class="p">})</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">delta</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">SET</span><span class="w"> </span><span class="py">neighbor</span><span class="err">.</span><span class="py">pagerank</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">neighbor</span><span class="err">.</span><span class="py">pagerank</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="py">0</span><span class="mf">.85</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="py">delta</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">neighbor</span><span class="err">.</span><span class="py">needs_full_recompute</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">false</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Incremental</span><span class="w"> </span><span class="py">community</span><span class="w"> </span><span class="py">detection</span><span class="w"> </span><span class="py">after</span><span class="w"> </span><span class="py">node</span><span class="w"> </span><span class="py">addition</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">new_node</span><span class="p">:</span><span class="nc">Node</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nv">$new_node_id</span><span class="p">})</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="nc">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">new_node</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">neighbor</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">neighbor</span><span class="err">.</span><span class="py">community</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">candidate_community</span><span class="p">,</span><span class="w"> </span><span class="py">COUNT</span><span class="p">(</span><span class="err">*</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">connections</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">connections</span><span class="w"> </span><span class="py">DESC</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">LIMIT</span><span class="w"> </span><span class="py">1</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">SET</span><span class="w"> </span><span class="py">new_node</span><span class="err">.</span><span class="py">community</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">candidate_community</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h4 id="memory-efficient-graph-traversal" class="position-relative d-flex align-items-center group">
<span>Memory-Efficient Graph Traversal</span>
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</h4><p>Handle billion-edge graphs with streaming:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Streaming</span><span class="w"> </span><span class="py">BFS</span><span class="w"> </span><span class="py">for</span><span class="w"> </span><span class="py">large</span><span class="w"> </span><span class="py">graphs</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="nv">$start_id</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">start_id</span><span class="p">,</span><span class="w"> </span><span class="py">0</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">level</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">CALL</span><span class="w"> </span><span class="p">{</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WITH</span><span class="w"> </span><span class="py">start_id</span><span class="p">,</span><span class="w"> </span><span class="py">level</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">current</span><span class="p">:</span><span class="nc">Node</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nc">start_id</span><span class="p">})</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">SET</span><span class="w"> </span><span class="py">current</span><span class="err">.</span><span class="py">level</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">level</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">RETURN</span><span class="w"> </span><span class="py">current</span><span class="err">.</span><span class="py">id</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">processed_id</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="p">}</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">level</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="py">1</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">next_level</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">CALL</span><span class="w"> </span><span class="p">{</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WITH</span><span class="w"> </span><span class="py">next_level</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">current</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">next</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WHERE</span><span class="w"> </span><span class="py">current</span><span class="err">.</span><span class="py">level</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">next_level</span><span class="w"> </span><span class="err">-</span><span class="w"> </span><span class="py">1</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">AND</span><span class="w"> </span><span class="py">next</span><span class="err">.</span><span class="py">level</span><span class="w"> </span><span class="py">IS</span><span class="w"> </span><span class="py">NULL</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">SET</span><span class="w"> </span><span class="py">next</span><span class="err">.</span><span class="py">level</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">next_level</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">RETURN</span><span class="w"> </span><span class="py">COUNT</span><span class="p">(</span><span class="py">next</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">nodes_at_level</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="p">}</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">TRANSACTIONS</span><span class="w"> </span><span class="py">OF</span><span class="w"> </span><span class="py">50000</span><span class="w"> </span><span class="py">ROWS</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">next_level</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">level</span><span class="p">,</span><span class="w"> </span><span class="py">nodes_at_level</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h3 id="algorithm-benchmarking-framework" class="position-relative d-flex align-items-center group">
<span>Algorithm Benchmarking Framework</span>
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<h4 id="performance-testing" class="position-relative d-flex align-items-center group">
<span>Performance Testing</span>
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</h4><p>Benchmark algorithm performance on your data:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Benchmark</span><span class="w"> </span><span class="py">PageRank</span><span class="w"> </span><span class="py">iterations</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">datetime</span><span class="p">()</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">start_time</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">SET</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">pagerank</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">1</span><span class="mf">.0</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">COUNT</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">m</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w"> </span><span class="p">}</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">//</span><span class="w"> </span><span class="py">Run</span><span class="w"> </span><span class="py">20</span><span class="w"> </span><span class="py">iterations</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">start_time</span><span class="p">,</span><span class="w"> </span><span class="py">range</span><span class="p">(</span><span class="py">1</span><span class="p">,</span><span class="w"> </span><span class="py">20</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">iterations</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">UNWIND</span><span class="w"> </span><span class="py">iterations</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">iter</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">CALL</span><span class="w"> </span><span class="p">{</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">source</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">target</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WITH</span><span class="w"> </span><span class="py">target</span><span class="p">,</span><span class="w"> </span><span class="py">SUM</span><span class="p">(</span><span class="py">source</span><span class="err">.</span><span class="py">pagerank</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">COUNT</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="p">(</span><span class="py">source</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-></span><span class="p">()</span><span class="w"> </span><span class="p">})</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">rank</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">SET</span><span class="w"> </span><span class="py">target</span><span class="err">.</span><span class="py">pagerank_new</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">0</span><span class="mf">.15</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="py">0</span><span class="mf">.85</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="py">rank</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="p">}</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">SET</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">pagerank</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">pagerank_new</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">REMOVE</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">pagerank_new</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">start_time</span><span class="p">,</span><span class="w"> </span><span class="py">datetime</span><span class="p">()</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">end_time</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">duration</span><span class="err">.</span><span class="py">between</span><span class="p">(</span><span class="py">start_time</span><span class="p">,</span><span class="w"> </span><span class="py">end_time</span><span class="p">)</span><span class="err">.</span><span class="py">milliseconds</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">runtime_ms</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">runtime_ms</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">20</span><span class="mf">.0</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">ms_per_iteration</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Memory</span><span class="w"> </span><span class="py">usage</span><span class="w"> </span><span class="py">profiling</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">CALL</span><span class="w"> </span><span class="py">dbms</span><span class="err">.</span><span class="py">memory</span><span class="err">.</span><span class="py">usage</span><span class="p">()</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">YIELD</span><span class="w"> </span><span class="py">used</span><span class="p">,</span><span class="w"> </span><span class="py">total</span><span class="p">,</span><span class="w"> </span><span class="py">peak</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">used</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">1024</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">1024</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">used_mb</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">total</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">1024</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">1024</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">total_mb</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">peak</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">1024</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">1024</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">peak_mb</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h4 id="convergence-analysis" class="position-relative d-flex align-items-center group">
<span>Convergence Analysis</span>
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</h4><p>Monitor algorithm convergence:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Track</span><span class="w"> </span><span class="py">PageRank</span><span class="w"> </span><span class="py">convergence</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="p">[]</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">convergence_history</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">convergence_history</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="p">[</span><span class="py">n</span><span class="err">.</span><span class="py">pagerank</span><span class="p">]</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">history</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">//</span><span class="w"> </span><span class="py">After</span><span class="w"> </span><span class="py">iteration</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">history</span><span class="p">,</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">pagerank_new</span><span class="w"> </span><span class="err">-</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">pagerank</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">delta</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">AVG</span><span class="p">(</span><span class="py">ABS</span><span class="p">(</span><span class="py">delta</span><span class="p">))</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">mean_change</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">MAX</span><span class="p">(</span><span class="py">ABS</span><span class="p">(</span><span class="py">delta</span><span class="p">))</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">max_change</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">STDDEV</span><span class="p">(</span><span class="py">ABS</span><span class="p">(</span><span class="py">delta</span><span class="p">))</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">stddev_change</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">mean_change</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">max_change</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">stddev_change</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">CASE</span><span class="w"> </span><span class="py">WHEN</span><span class="w"> </span><span class="py">mean_change</span><span class="w"> </span><span class="err"><</span><span class="w"> </span><span class="py">0</span><span class="mf">.0001</span><span class="w"> </span><span class="py">THEN</span><span class="w"> </span><span class="err">'</span><span class="py">CONVERGED</span><span class="err">'</span><span class="w"> </span><span class="py">ELSE</span><span class="w"> </span><span class="err">'</span><span class="py">CONTINUE</span><span class="err">'</span><span class="w"> </span><span class="py">END</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">status</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h3 id="industry-specific-applications" class="position-relative d-flex align-items-center group">
<span>Industry-Specific Applications</span>
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</h3>
<h4 id="financial-networks" class="position-relative d-flex align-items-center group">
<span>Financial Networks</span>
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</h4><p>Detect systemic risk and contagion:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Bank</span><span class="w"> </span><span class="py">exposure</span><span class="w"> </span><span class="py">network</span><span class="w"> </span><span class="py">analysis</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">bank</span><span class="p">:</span><span class="nc">Bank</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">exp</span><span class="p">:</span><span class="nc">EXPOSURE</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">counterparty</span><span class="p">:</span><span class="nc">Bank</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">bank</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">SUM</span><span class="p">(</span><span class="py">exp</span><span class="err">.</span><span class="py">amount</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">total_exposure</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">bank</span><span class="err">.</span><span class="py">capital</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">capital</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">bank</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">total_exposure</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">capital</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">leverage_ratio</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">leverage_ratio</span><span class="w"> </span><span class="err">></span><span class="w"> </span><span class="py">10</span><span class="mf">.0</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="py">bank</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">EXPOSURE</span><span class="err">*</span><span class="py">1</span><span class="err">.</span><span class="mf">.3</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">systemic</span><span class="p">:</span><span class="nc">Bank</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">systemic</span><span class="err">.</span><span class="py">systemically_important</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">true</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">bank</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">leverage_ratio</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">COUNT</span><span class="p">(</span><span class="py">DISTINCT</span><span class="w"> </span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">contagion_paths</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">SUM</span><span class="p">([</span><span class="py">r</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">relationships</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">amount</span><span class="p">])</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">total_risk</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">total_risk</span><span class="w"> </span><span class="py">DESC</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h4 id="supply-chain-optimization" class="position-relative d-flex align-items-center group">
<span>Supply Chain Optimization</span>
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</h4><p>Identify bottlenecks and optimize flows:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Critical</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="py">analysis</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="py">supplier</span><span class="p">:</span><span class="nc">Supplier</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">SUPPLIES</span><span class="err">*</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">manufacturer</span><span class="p">:</span><span class="nc">Manufacturer</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="err">-</span><span class="p">[:</span><span class="nc">SHIPS</span><span class="err">*</span><span class="p">]</span><span class="err">-></span><span class="p">(</span><span class="py">distributor</span><span class="p">:</span><span class="nc">Distributor</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">path</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">REDUCE</span><span class="p">(</span><span class="py">time</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">0</span><span class="p">,</span><span class="w"> </span><span class="py">r</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">relationships</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="py">time</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">lead_time_days</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">total_time</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">total_time</span><span class="w"> </span><span class="py">DESC</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">LIMIT</span><span class="w"> </span><span class="py">1</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="p">[</span><span class="py">n</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">nodes</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">name</span><span class="p">]</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">critical_path</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">total_time</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">longest_lead_time</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="p">[</span><span class="py">r</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">relationships</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">lead_time_days</span><span class="p">]</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">segment_times</span><span class="err">;</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="err">--</span><span class="w"> </span><span class="py">Bottleneck</span><span class="w"> </span><span class="py">identification</span><span class="w"> </span><span class="p">(</span><span class="py">max</span><span class="w"> </span><span class="py">flow</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">factory</span><span class="p">:</span><span class="nc">Factory</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nv">$factory_id</span><span class="p">})</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="nc">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">warehouse</span><span class="p">:</span><span class="nc">Warehouse</span><span class="w"> </span><span class="p">{</span><span class="py">id</span><span class="p">:</span><span class="w"> </span><span class="nv">$warehouse_id</span><span class="p">})</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="nc">CALL</span><span class="w"> </span><span class="py">algorithms</span><span class="err">.</span><span class="py">maxFlow</span><span class="p">(</span><span class="py">factory</span><span class="p">,</span><span class="w"> </span><span class="py">warehouse</span><span class="p">,</span><span class="w"> </span><span class="err">'</span><span class="py">SHIPS</span><span class="err">'</span><span class="p">,</span><span class="w"> </span><span class="err">'</span><span class="py">capacity</span><span class="err">'</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">YIELD</span><span class="w"> </span><span class="py">path</span><span class="p">,</span><span class="w"> </span><span class="py">flow</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">REDUCE</span><span class="p">(</span><span class="py">min_cap</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">999999</span><span class="p">,</span><span class="w"> </span><span class="py">r</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">relationships</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="p">|</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">CASE</span><span class="w"> </span><span class="py">WHEN</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">capacity</span><span class="w"> </span><span class="err"><</span><span class="w"> </span><span class="py">min_cap</span><span class="w"> </span><span class="py">THEN</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">capacity</span><span class="w"> </span><span class="py">ELSE</span><span class="w"> </span><span class="py">min_cap</span><span class="w"> </span><span class="py">END</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">bottleneck_capacity</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">path</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="p">[</span><span class="py">n</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">nodes</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="py">n</span><span class="err">.</span><span class="py">name</span><span class="p">]</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">supply_chain_path</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">bottleneck_capacity</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="err">'</span><span class="py">Bottleneck</span><span class="w"> </span><span class="py">at</span><span class="w"> </span><span class="err">'</span><span class="w"> </span><span class="err">+</span><span class="w"> </span><span class="p">[</span><span class="py">r</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">relationships</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="py">WHERE</span><span class="w"> </span><span class="py">r</span><span class="err">.</span><span class="py">capacity</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">bottleneck_capacity</span><span class="p">][</span><span class="py">0</span><span class="p">]</span><span class="err">.</span><span class="py">name</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">bottleneck_location</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h4 id="biological-networks" class="position-relative d-flex align-items-center group">
<span>Biological Networks</span>
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</h4><p>Analyze protein interactions and pathways:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Protein</span><span class="err">-</span><span class="py">protein</span><span class="w"> </span><span class="py">interaction</span><span class="w"> </span><span class="py">centrality</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">protein</span><span class="p">:</span><span class="nc">Protein</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">OPTIONAL</span><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">protein</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">INTERACTS_WITH</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">partner</span><span class="p">:</span><span class="nc">Protein</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">protein</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">COUNT</span><span class="p">(</span><span class="py">DISTINCT</span><span class="w"> </span><span class="py">partner</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">degree</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">AVG</span><span class="p">(</span><span class="py">partner</span><span class="err">.</span><span class="py">expression_level</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">avg_partner_expression</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">degree</span><span class="w"> </span><span class="err">></span><span class="p">=</span><span class="w"> </span><span class="py">10</span><span class="w"> </span><span class="err">//</span><span class="w"> </span><span class="py">Hub</span><span class="w"> </span><span class="py">proteins</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">shortestPath</span><span class="p">((</span><span class="py">protein</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">INTERACTS_WITH</span><span class="err">*</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">disease</span><span class="p">:</span><span class="nc">Disease</span><span class="p">))</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">protein</span><span class="err">.</span><span class="py">name</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">degree</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">interaction_count</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">avg_partner_expression</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">LENGTH</span><span class="p">(</span><span class="py">path</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">disease_proximity</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">protein</span><span class="err">.</span><span class="py">function</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">biological_role</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">degree</span><span class="w"> </span><span class="py">DESC</span><span class="p">,</span><span class="w"> </span><span class="py">disease_proximity</span><span class="w"> </span><span class="py">ASC</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h3 id="visualization-and-analysis" class="position-relative d-flex align-items-center group">
<span>Visualization and Analysis</span>
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</h3>
<h4 id="graph-metric-dashboard" class="position-relative d-flex align-items-center group">
<span>Graph Metric Dashboard</span>
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</h4><p>Compute comprehensive graph statistics:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Complete</span><span class="w"> </span><span class="py">graph</span><span class="w"> </span><span class="py">analytics</span><span class="w"> </span><span class="py">dashboard</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">COUNT</span><span class="p">(</span><span class="py">n</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">node_count</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">COLLECT</span><span class="p">(</span><span class="py">n</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">all_nodes</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">()</span><span class="err">-</span><span class="p">[</span><span class="py">r</span><span class="p">:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-</span><span class="p">()</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">node_count</span><span class="p">,</span><span class="w"> </span><span class="py">all_nodes</span><span class="p">,</span><span class="w"> </span><span class="py">COUNT</span><span class="p">(</span><span class="py">r</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">edge_count</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">node_count</span><span class="p">,</span><span class="w"> </span><span class="py">edge_count</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">edge_count</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="py">2</span><span class="mf">.0</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="p">(</span><span class="py">node_count</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="p">(</span><span class="py">node_count</span><span class="w"> </span><span class="err">-</span><span class="w"> </span><span class="py">1</span><span class="p">))</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">density</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">edge_count</span><span class="w"> </span><span class="err">*</span><span class="w"> </span><span class="py">1</span><span class="mf">.0</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">node_count</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">avg_degree</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">OPTIONAL</span><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">r</span><span class="p">:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-</span><span class="p">()</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">node_count</span><span class="p">,</span><span class="w"> </span><span class="py">edge_count</span><span class="p">,</span><span class="w"> </span><span class="py">density</span><span class="p">,</span><span class="w"> </span><span class="py">avg_degree</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">COUNT</span><span class="p">(</span><span class="py">r</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">node_degree</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">node_count</span><span class="p">,</span><span class="w"> </span><span class="py">edge_count</span><span class="p">,</span><span class="w"> </span><span class="py">density</span><span class="p">,</span><span class="w"> </span><span class="py">avg_degree</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">COLLECT</span><span class="p">(</span><span class="py">node_degree</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">degree_dist</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">node_count</span><span class="p">,</span><span class="w"> </span><span class="py">edge_count</span><span class="p">,</span><span class="w"> </span><span class="py">density</span><span class="p">,</span><span class="w"> </span><span class="py">avg_degree</span><span class="p">,</span><span class="w"> </span><span class="py">degree_dist</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">percentile_cont</span><span class="p">(</span><span class="py">degree_dist</span><span class="p">,</span><span class="w"> </span><span class="py">0</span><span class="mf">.5</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">median_degree</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">percentile_cont</span><span class="p">(</span><span class="py">degree_dist</span><span class="p">,</span><span class="w"> </span><span class="py">0</span><span class="mf">.95</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">p95_degree</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="py">path</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="py">shortestPath</span><span class="p">((</span><span class="py">a</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="err">-</span><span class="p">[:</span><span class="nc">EDGE</span><span class="err">*</span><span class="p">]</span><span class="err">-</span><span class="p">(</span><span class="py">b</span><span class="p">:</span><span class="nc">Node</span><span class="p">))</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WHERE</span><span class="w"> </span><span class="py">a</span><span class="w"> </span><span class="err"><></span><span class="w"> </span><span class="py">b</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">node_count</span><span class="p">,</span><span class="w"> </span><span class="py">edge_count</span><span class="p">,</span><span class="w"> </span><span class="py">density</span><span class="p">,</span><span class="w"> </span><span class="py">avg_degree</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">median_degree</span><span class="p">,</span><span class="w"> </span><span class="py">p95_degree</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">MAX</span><span class="p">(</span><span class="py">LENGTH</span><span class="p">(</span><span class="py">path</span><span class="p">))</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">diameter</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">AVG</span><span class="p">(</span><span class="py">LENGTH</span><span class="p">(</span><span class="py">path</span><span class="p">))</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">avg_path_length</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">node_count</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">edge_count</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">density</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">avg_degree</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">median_degree</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">p95_degree</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">diameter</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">avg_path_length</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">CASE</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WHEN</span><span class="w"> </span><span class="py">avg_path_length</span><span class="w"> </span><span class="err">/</span><span class="w"> </span><span class="py">log</span><span class="p">(</span><span class="py">node_count</span><span class="p">)</span><span class="w"> </span><span class="err"><</span><span class="w"> </span><span class="py">2</span><span class="w"> </span><span class="py">THEN</span><span class="w"> </span><span class="err">'</span><span class="py">Small</span><span class="w"> </span><span class="py">World</span><span class="err">'</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WHEN</span><span class="w"> </span><span class="py">density</span><span class="w"> </span><span class="err">></span><span class="w"> </span><span class="py">0</span><span class="mf">.1</span><span class="w"> </span><span class="py">THEN</span><span class="w"> </span><span class="err">'</span><span class="py">Dense</span><span class="err">'</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">ELSE</span><span class="w"> </span><span class="err">'</span><span class="py">Sparse</span><span class="err">'</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">END</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">graph_type</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h4 id="degree-distribution-analysis" class="position-relative d-flex align-items-center group">
<span>Degree Distribution Analysis</span>
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</h4><p>Identify network topology:</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-gql" data-lang="gql"><span class="line"><span class="cl"><span class="err">--</span><span class="w"> </span><span class="py">Degree</span><span class="w"> </span><span class="py">distribution</span><span class="w"> </span><span class="py">histogram</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">:</span><span class="nc">Node</span><span class="p">)</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">OPTIONAL</span><span class="w"> </span><span class="py">MATCH</span><span class="w"> </span><span class="p">(</span><span class="py">n</span><span class="p">)</span><span class="err">-</span><span class="p">[</span><span class="py">r</span><span class="p">:</span><span class="nc">EDGE</span><span class="p">]</span><span class="err">-</span><span class="p">()</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">n</span><span class="p">,</span><span class="w"> </span><span class="py">COUNT</span><span class="p">(</span><span class="py">r</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">degree</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">degree</span><span class="p">,</span><span class="w"> </span><span class="py">COUNT</span><span class="p">(</span><span class="py">n</span><span class="p">)</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">frequency</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">ORDER</span><span class="w"> </span><span class="py">BY</span><span class="w"> </span><span class="py">degree</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">WITH</span><span class="w"> </span><span class="py">COLLECT</span><span class="p">({</span><span class="py">degree</span><span class="p">:</span><span class="w"> </span><span class="nc">degree</span><span class="p">,</span><span class="w"> </span><span class="py">count</span><span class="p">:</span><span class="w"> </span><span class="nc">frequency</span><span class="p">})</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">distribution</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="py">RETURN</span><span class="w"> </span><span class="py">distribution</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">CASE</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WHEN</span><span class="w"> </span><span class="py">distribution</span><span class="p">[</span><span class="err">-</span><span class="py">1</span><span class="p">]</span><span class="err">.</span><span class="py">count</span><span class="w"> </span><span class="err">></span><span class="w"> </span><span class="py">distribution</span><span class="p">[</span><span class="py">0</span><span class="p">]</span><span class="err">.</span><span class="py">count</span><span class="w"> </span><span class="py">THEN</span><span class="w"> </span><span class="err">'</span><span class="py">Power</span><span class="w"> </span><span class="py">Law</span><span class="w"> </span><span class="p">(</span><span class="py">Scale</span><span class="err">-</span><span class="py">Free</span><span class="p">)</span><span class="err">'</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">WHEN</span><span class="w"> </span><span class="py">AVG</span><span class="p">([</span><span class="py">d</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">distribution</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="py">ABS</span><span class="p">(</span><span class="py">d</span><span class="err">.</span><span class="py">count</span><span class="w"> </span><span class="err">-</span><span class="w"> </span><span class="py">AVG</span><span class="p">([</span><span class="py">x</span><span class="w"> </span><span class="py">IN</span><span class="w"> </span><span class="py">distribution</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="py">x</span><span class="err">.</span><span class="py">count</span><span class="p">]))])</span><span class="w"> </span><span class="err"><</span><span class="w"> </span><span class="py">2</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">THEN</span><span class="w"> </span><span class="err">'</span><span class="py">Regular</span><span class="w"> </span><span class="py">Network</span><span class="err">'</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">ELSE</span><span class="w"> </span><span class="err">'</span><span class="py">Random</span><span class="w"> </span><span class="py">Network</span><span class="err">'</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"> </span><span class="py">END</span><span class="w"> </span><span class="py">AS</span><span class="w"> </span><span class="py">topology_type</span><span class="err">;</span><span class="w">
</span></span></span></code></pre></div>
<h3 id="further-reading" class="position-relative d-flex align-items-center group">
<span>Further Reading</span>
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</h3><ul>
<li><strong>Graph Algorithms</strong>: Practical Examples in Network Science</li>
<li><strong>Network Analysis with GQL</strong>: Advanced Query Patterns and Optimization</li>
<li><strong>Scalable Graph Processing</strong>: Distributed Algorithms for Billion-Node Graphs</li>
<li><strong>Machine Learning on Graphs</strong>: Graph Neural Networks and Embedding Techniques</li>
<li><strong>Social Network Analysis</strong>: Community Detection and Influence Propagation</li>
<li><strong>Graph Algorithm Complexity</strong>: Theoretical Foundations and Practical Bounds</li>
<li><strong>Production Graph Analytics</strong>: Real-Time Processing at Scale</li>
</ul>
<h3 id="related-topics-1" class="position-relative d-flex align-items-center group">
<span>Related Topics</span>
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</h3><ul>
<li><a
href="/tags/pattern-matching/"
>Pattern Matching</a>
</li>
<li><a
href="/tags/query-optimization/"
>Query Optimization</a>
</li>
<li><a
href="/tags/performance/"
>Performance Optimization</a>
</li>
<li><a
href="/tags/analytics/"
>Analytics</a>
</li>
</ul>
<p>Browse the tagged content below to discover documentation, tutorials, and guides for implementing graph algorithms in your Geode applications.</p>
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