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The fuller name, Okapi BM25, includes the name of the first system to use it, which was the Okapi information retrieval system, implemented at London's City University[1] in the 1980s and 1990s
The Wharton School of the University of Pennsylvania and the Stanford Graduate School of Business integrate simulation exercises into their MBA curricula, allowing students to apply classroom concepts in risk-free environments
S-Class Information Retrieval
The empirically validated retrieval progression is BM25 then learned-sparse then dense then hybrid fusion with re-ranking
NOTE: ACM DL title omits the trailing word Research; the project site and arXiv include it
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[7] It was initially available for download from its home at the SourceForge web site
1 200 OK Date: Thu, 02 Jul 2026 17:06:57 GMT Content-Type: text/html; charset=utf-8 Vary: X-PJAX, X-PJAX-Container, Turbo-Visit, Turbo-Frame, X-Requested-With, Sec-Fetch-Site,Accept-Encoding, Accept, X-Requested-With ETag: W/"5c10b5686e0c159df9d5da5670da3dcd" Cache-Control: max-age=0, private, must-revalidate Strict
sqlite3</code><ref>{{cite web\n |url = https://www
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1000) (June 12, 2026 ; 12 days ago  ( 2026-06-12 ) [ 9 ] )  [±] Repository github
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html |url-status=live }}</ref>}}"},"launched":{"wt":"{{Ubl|{{Start date and age|1995}} (first prototype)|{{Start date and age|1997}} (final launch)}}"},"area_served":{"wt":"Worldwide (except China and North Korea)"},"owner":{"wt":"[[Google]]"},"revenue":{"wt":"[[Google Ads]]"},"current_status":{"wt":"Online"},"ipv6":