Technical GlossaryNatural Language Processing
Query Expansion
An approach that broadens retrieval coverage by enriching the user query with synonyms, related terms, or rewrites.
Query expansion is used to capture documents that express the user’s need in different ways. It can broaden coverage especially in sparse retrieval systems, but poor expansions may hurt precision. For that reason, query expansion requires careful management of the balance between coverage and relevance quality.
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