HyDE
Hypothetical Document Embeddings. LLM writes a plausible answer to query. Embed that hypothetical. Retrieve similar docs. Better for question queries.
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Multi-query
LLM rephrases query 3-5 ways. Retrieve for each. Union results. Handles synonym mismatch.
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GraphRAG
Microsoft technique. Build knowledge graph from corpus. Retrieve subgraph. LLM reasons over structured relations. Beats flat RAG on multi-hop.