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https://issues.apache.org/jira/browse/LUCENE-2091?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yuval Feinstein updated LUCENE-2091:
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    Attachment: LUCENE-2091.patch

I have attached a patch for this case. This is Joaquin's BM25 and BM25F 
library. I refactored it a bit for speed. It should work with the trunk. I have 
tested it lightly, mainly through unit tests. Your feedback is more than 
welcome. 

> 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
>
>         Attachments: LUCENE-2091.patch, persianlucene.jpg
>
>   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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