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wiki/concepts/BM25.md
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title: "BM25"
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type: concept
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tags: []
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sources: []
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last_updated: 2026-04-17
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---
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## Definition
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BM25(Best Matching 25)是一种基于关键词的全文搜索算法,用于信息检索。
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## Principle
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基于词频(TF)和逆文档频率(IDF)计算关键词与文档的相关度评分。
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## Use Case
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- 与向量嵌入结合实现混合搜索,通过 RRF reranking 合并结果
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## Aliases
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- BM25
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- Okapi BM25
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