Graph Retrieval-Augmented Generation: A Survey

This comprehensive survey categorizes GraphRAG into three paradigms: Graph-Based Indexing (G-Indexing) for constructing graph structures during indexing, Graph-Guided Retrieval (G-Retrieval) for using graphs to guide retrieval, and Graph-Enhanced Generation (G-Generation) for incorporating graph information into generation. It covers evaluation methodologies, benchmark datasets, and identifies open challenges including scalability and dynamic graph updates.