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Keyword search (BM25)

10 min applied15 min research1 curated resources

Build a keyword search: BM25 scores FAQs by shared words (smarter TF-IDF). Measure Recall@1, Recall@3 and MRR. See where it fails: 'my card hasn't shown up' vs FAQ 'When will my card arrive?' share few words.

Builds on: 1.3 Turning text into numbers

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