Synonym Expansion Cannot Lower Recall. That Is Exactly Why Recall Is the Wrong Thing to Tune It On.
Query rewriting is the first stage of most RAG pipelines and the one that gets tuned by vibes. So I built a real BM25 index over a real corpus, applied real rewrites, and scored them against hand-labelled relevance. 👉 Live, runs in your browser: https://dev48.in/ai/days/day82-query-rewriting.html…
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- 2026-11-03 08:25 · DEV Community — AI
Synonym Expansion Cannot Lower Recall. That Is Exactly Why Recall Is the Wrong Thing to Tune It On.