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From "Otis Gospodnetic (JIRA)" <>
Subject [jira] Commented: (LUCENE-2091) Add BM25 Scoring to Lucene
Date Mon, 30 Nov 2009 04:02:20 GMT


Otis Gospodnetic commented on LUCENE-2091:

Has anyone compared this particular BM25 impl. to the current Lucene's quasi-VSM approach
in terms of:
* any of the relevance eval methods
* indexing performance
* search performance
* ...

Also, this issue is marked as contrib/*.  Should this not go straight to core, so more people
actually use this and provide feedback?  Who knows, there is a chance (ha!) BM25 might turn
out better than the current approach, and become the default.

> 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
>   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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