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---
-title: "RRF（Reranking）"
-type: concept
-tags: []
-sources: [https://github.com/zilliztech/memsearch]
-last_updated: 2026-04-17
---
-
-## Definition
-RRF（Reciprocal Rank Fusion，倒数排名融合）是一种将多路搜索结果合并排序的算法。
-
-## Principle
-对不同搜索方法的结果按排名倒数（1/(k+rank)）加权求和，得到综合排名。
-
-## Use Case
- 合并语义搜索（向量嵌入）和关键词搜索（BM25）的结果，提升搜索质量
-
-## Aliases
- RRF
- Reciprocal Rank Fusion