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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