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TREC

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09:35
2026-08-10
dev.to
machine-learning

BM25 Length Normalization: Why Long RAG Chunks Never Rank

A developer found that BM25's default length normalization parameter (b=0.75) systematically penalizes long RAG chunks, causing exact-answer chunks to rank below irrelevant headings. The analysis show…

// co-occurs with top 5 entities
BM25 1 Lucene 1 Elasticsearch 1 OpenSearch 1 rank_bm25 1
// topics top 4 topics
machine learning 1 large language models 1 ai infrastructure 1 developer tools 1