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From "Yuval Feinstein (JIRA)" <>
Subject [jira] Commented: (LUCENE-2091) Add BM25 Scoring to Lucene
Date Mon, 30 Nov 2009 07:03:20 GMT


Yuval Feinstein commented on LUCENE-2091:

Otis and Robert, Here's my (limited) experience with BM25:
On a proprietary corpus (alas) I got a nice improvement, which was more pronounced in recall
(hits that were previously not ranked as top ones, and therefore remained unseen, now appear
in the top results).
I have worked on lowering the BM25 run time to a reasonable level.
I hope that once this gets into the hands of the Lucene community, BM25 performance 
will approach the current Lucene scoring's performance. This is a tall order,
as the latter has been in the works for the last eight years or so.
As for use cases, in my use case BM25 helps, I believe this may be true for other cases.

> Add BM25 Scoring to Lucene
> --------------------------
>                 Key: LUCENE-2091
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: contrib/*
>            Reporter: Yuval Feinstein
>            Priority: Minor
>             Fix For: 3.1
>         Attachments: persianlucene.jpg
>   Original Estimate: 48h
>  Remaining Estimate: 48h
> describes an implementation of Okapi-BM25 scoring
in the Lucene framework,
> as an alternative to the standard Lucene scoring (which is a version of mixed boolean/TFIDF).
> I have refactored this a bit, added unit tests and improved the runtime somewhat.
> I would like to contribute the code to Lucene under contrib. 

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