rag-hybrid-search

Implement hybrid search combining semantic vector retrieval with keyword-based BM25 search for improved RAG pipeline accuracy and recall.

Overview

Hybrid search addresses the limitations of pure semantic or pure keyword search:

• Semantic search excels at conceptual similarity but may miss exact matches
• Keyword search finds exact terms but lacks semantic understanding
• Hybrid combines both for superior retrieval performance

Capabilities

Search Strategies

• Dense vector semantic search (embeddings)
• Sparse vector keyword search (BM25, TF-IDF)
• Hybrid fusion with configurable weighting
• Reciprocal Rank Fusion (RRF) combination