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Retrieval
Reciprocal Rank Fusion (RRF)
A simple algorithm for merging multiple ranked result lists.
RRF combines results from multiple retrievers (e.g., BM25 and dense vector search) by summing 1/(rank + k) for each document across the lists. It is parameter-free (k=60 is a fine default), needs no training, and reliably outperforms more complex fusion methods. The standard merge for hybrid search.
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