This video introduces HiRAG (Hierarchical Reasoning for GraphRAG), a novel retrieval-augmented generation (RAG) system that utilizes a hierarchical knowledge graph structure to improve reasoning capabilities. The presenter explains the architecture and methodology of HiRAG, highlighting its advantages over traditional flat knowledge graphs and other RAG methods, particularly in handling complex, multi-layered information.
HiRAG has a two-phase architecture: Hi-Index and Hi-Retrieve.
Hi-Index (Offline Phase):
Hi-Retrieve (Online Phase):