[jira] [Commented] (LUCENE-5175) Add parameter to lower-bound TF normalization for BM25 (for long documents)

["Robert Muir (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-5175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13738474#comment-13738474 ] 

Robert Muir commented on LUCENE-5175:
-------------------------------------

I can benchmark your patch with luceneutil Tom.
I know this thing is sensitive for some reason.

Really if there is a performance issue, worst case we can just call it BM25L or something?

Thanks for doing this!
                
> Add parameter to lower-bound TF normalization for BM25 (for long documents)
> ---------------------------------------------------------------------------
>
>                 Key: LUCENE-5175
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5175
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/search
>            Reporter: Tom Burton-West
>            Priority: Minor
>         Attachments: LUCENE-5175.patch
>
>
> In the article "When Documents Are Very Long, BM25 Fails!" a fix for the problem is documented.  There was a TODO note in BM25Similarity to add this fix. I will attach a patch that implements the fix shortly.

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