Hybrid search in Python: BM25 + vectors with Reciprocal Rank Fusion, alpha swept 0 to 1
Should you fuse BM25 with vector search, and what weight should each side get? I ran both retrievers separately and fused them with Reciprocal Rank Fusion (RRF) across three different query styles, sweeping the fusion weight from pure vector to pure BM25. Result: no single retriever wins everywhere…
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- 2026-10-31 06:29 · DEV Community — Machine Learning
Hybrid search in Python: BM25 + vectors with Reciprocal Rank Fusion, alpha swept 0 to 1