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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
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1 200 OK Date: Thu, 02 Jul 2026 19:47:30 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/"1ac518a72b4901f1a5a68408c23cf2a7" Cache-Control: max-age=0, private, must-revalidate Strict
1 200 OK Date: Thu, 02 Jul 2026 19:46:58 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/"224585a2a0e3e3163a01d12f9ff2f6bf" Cache-Control: max-age=0, private, must-revalidate Strict
1 200 OK Date: Thu, 02 Jul 2026 19:46:47 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/"7a76809f6ec3aafe1d4cbdfbcf13223d" Cache-Control: max-age=0, private, must-revalidate Strict
1 200 OK Date: Thu, 02 Jul 2026 16:54:32 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/"265baa85c7684e28d15c55e0a43ae54c" Cache-Control: max-age=0, private, must-revalidate Strict
1 200 OK Date: Thu, 02 Jul 2026 21:47:09 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/"764842f7a6fd6df0a8d57caaf9c860d1" Cache-Control: max-age=0, private, must-revalidate Strict
1 200 OK Date: Thu, 02 Jul 2026 16:53:48 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/"3c1b1e9e1490fb726e22e11ab6788493" Cache-Control: max-age=0, private, must-revalidate Strict
1 200 OK Date: Thu, 02 Jul 2026 16:54:21 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/"26dfd90bfcac5e8fd65691a38e8d86b0" Cache-Control: max-age=0, private, must-revalidate Strict
1 200 OK Date: Thu, 02 Jul 2026 16:53:59 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/"563ef1aa4a8f6d2e7b65a34501152d39" Cache-Control: max-age=0, private, must-revalidate Strict
1 200 OK Date: Thu, 02 Jul 2026 17:07:19 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/"7f53a7c4a1b003e79f3563086b10bf3a" Cache-Control: max-age=0, private, must-revalidate Strict
S-Class Information Retrieval
The empirically validated retrieval progression is BM25 then learned-sparse then dense then hybrid fusion with re-ranking
1 200 OK Date: Thu, 02 Jul 2026 19:47:09 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/"4ad4d37c9015c110ecc0e7ddb593aeec" Cache-Control: max-age=0, private, must-revalidate Strict
1 200 OK Date: Thu, 02 Jul 2026 16:54:10 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/"554c4addd0da505c1c2f60255b83a6e8" Cache-Control: max-age=0, private, must-revalidate Strict
1 200 OK Date: Thu, 02 Jul 2026 17:06:44 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/"47aa9c1d17c88f3a190a8326a978c3c3" Cache-Control: max-age=0, private, must-revalidate Strict
[7] It was initially available for download from its home at the SourceForge web site
If, further, Γ is a region sufficiently close to the boundary of Ω that f is twice continuously differentiable on it, then there is an explicit formula involving the Weingarten map W x for the Jacobian of changing variables in terms of the signed distance function and nearest boundary point
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com\n |date=28 February 2020\n |access-date=18 April 2021\n}}</ref> and contributors<ref>\n{{LSR\n |url=https://github
In other projects Wikimedia Commons Wikidata item Appearance move to sidebar hide From Wikipedia, the free encyclopedia American photo storage and image hosting website Photobucket Type of site Image hosting service Available in English Owner Photobucket
com/containers/podman/issues) and [PRs](https://github
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