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From "Vinay Setty (JIRA)" <>
Subject [jira] Commented: (LUCENE-2091) Add BM25 Scoring to Lucene
Date Wed, 19 May 2010 09:07:56 GMT


Vinay Setty commented on LUCENE-2091:

@Joaquin, I want to use BM25 scoring for evaluating phrase queries, I have created a positional
index in Lucene, but have no clue how to use it for evaluating phrase queries using BM25 scorer.
I had a quick look at the code, by default the queries are boolean, and could not find a easy
way to make it phrase query. Any ideas?

> 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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