Okapi BM25
technology→ stable
BM25
In information retrieval, Okapi BM25 is a ranking function used by search engines to estimate the relevance of documents to a given search query. It is based on the probabilistic retrieval framework developed in the 1970s and 1980s by Stephen E. Robertson, Karen Spärck Jones, and others.
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0.0%Velocity (7d)
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1- Research MilestoneApr 5, 2026
BM25 algorithm, developed in the 1990s, continues to be essential for production search systems
View source- era:
- 1990s
- application:
- search ranking
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