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From "ian towey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-2091) Add BM25 Scoring to Lucene
Date Thu, 16 Jun 2011 15:51:47 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13050508#comment-13050508
] 

ian towey commented on LUCENE-2091:
-----------------------------------

Not sure am i using this BM25BooleanQuery correctly, getting variation in the number of hits
when testing v QueryParser. Is there limitations to the query string that BM25BooleanQuery
can deal with, e.g.  "gas OR ((oil AND car) NOT ship)", the results returned by BM25BooleanQuery
seem to be the all docs that don't contain the term "ship", (comparing  BM25BooleanQuery v
QueryParser)


> 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: modules/other
>            Reporter: Yuval Feinstein
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: BM25SimilarityProvider.java, 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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