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https://issues.apache.org/jira/browse/LUCENE-5175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13741582#comment-13741582
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Tom Burton-West commented on LUCENE-5175:
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Hi Robert,
I tried running luceneutils with the default wikimedium10m collection and
tasks. I ran it first on the DefaultSimilarity, which shouldn't be affected
by the patch to BM25Similarity and it showed about -2.3% difference. I'm
guessing there is some inaccuracy in the tests. When I changed
DEFAULT_SIMILARITY to BM25Similarity, the worst change was a difference of
-8.8%.
Is there a separate mailing list for questions about luceneutils or should I
write to the java-dev list? or directly to Mike or you?
Tom
> 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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