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---
title: "BM25"
type: concept
tags: []
sources: []
last_updated: 2026-04-17
---
## Definition
BM25Best Matching 25是一种基于关键词的全文搜索算法用于信息检索。
## Principle
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。
## Use Case
- 与向量嵌入结合实现混合搜索,通过 RRF reranking 合并结果
## Aliases
- BM25
- Okapi BM25