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From "Yuval Feinstein (JIRA)" <>
Subject [jira] Commented: (LUCENE-2091) Add BM25 Scoring to Lucene
Date Mon, 24 May 2010 13:36:31 GMT


Yuval Feinstein commented on LUCENE-2091:

@Vinay - I have this suggestion. I am unsure whether it will work. 
First, I would implement the BM25BooleanQuery, and use it to create a QueryWrapperFilter qwf.
Next, I would create a Phrase query, and call search(phraseQuery, qwf, 50).
This way, the scorer will first look for matches for the BM25 query, and later look among
them for matches for the phrase query.
Hope this is understandable.
-- Yuval 

> 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: 4.0
>         Attachments:, LUCENE-2091.patch, 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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