HyDE

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1. 6d
   RAG Query Expansion with HyDE and Multi-Query Rewriting

   This tutorial demonstrates how HyDE and multi-query rewriting can expand retrieval entry points for complete queries whose wording differs from knowledge-base documents. Using PostgreSQL 16, pgvector 0.8, bge-m3, and RRF fusion, the author reports that multi-query expansion plus the original query achieved 86% recall@5, compared with 72% without expansion and 80% for HyDE alone, though at higher latency. The evaluation covers 100 queries from the author's device knowledge base and therefore is not a general benchmark.

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