Community Detection with Neo4j GDS and Leiden Algorithm

The Leiden algorithm is preferred for GraphRAG. Implementation: 1) Project graph with gds.graph.project, 2) Run Leiden with gds.leiden.write including maxLevels and gamma parameters, 3) Query communities. Key parameters: gamma controls granularity (higher = smaller communities), maxLevels controls hierarchy depth. Leiden improves on Louvain by guaranteeing well-connected communities.