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Date: Mon, 30 Nov 2009 04:22:20 +0000 (UTC)
From: "Otis Gospodnetic (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Issue Comment Edited: (LUCENE-2091) Add BM25 Scoring to
 Lucene
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    [ https://issues.apache.org/jira/browse/LUCENE-2091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783530#action_12783530 ] 

Otis Gospodnetic edited comment on LUCENE-2091 at 11/30/09 4:21 AM:
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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
* ...

Aha, I found something:
http://markmail.org/message/c2r4v7zj7mduzs5d

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.

      was (Author: otis):
    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: https://issues.apache.org/jira/browse/LUCENE-2091
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: contrib/*
>            Reporter: Yuval Feinstein
>            Priority: Minor
>             Fix For: 3.1
>
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> http://nlp.uned.es/~jperezi/Lucene-BM25/ 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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