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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
[7] It was initially available for download from its home at the SourceForge web site
S-Class Information Retrieval
The empirically validated retrieval progression is BM25 then learned-sparse then dense then hybrid fusion with re-ranking
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It thus arrives at expressions in terms of those symbols for expressions and variables in the program, and constraints in terms of those symbols for the possib
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