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https://issues.apache.org/jira/browse/LUCENE-7776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15965518#comment-15965518
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ASF subversion and git services commented on LUCENE-7776:
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Commit 7fde878ae4780f1837189e4e8c531b373bc87c07 in lucene-solr's branch
refs/heads/master from [~teofili]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=7fde878 ]
LUCENE-7776 - adjusted failing tests in solr due to switching to bm25 in knn
> Switch KNN classifier to use BM25 similarity
> --------------------------------------------
>
> Key: LUCENE-7776
> URL: https://issues.apache.org/jira/browse/LUCENE-7776
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/classification
> Reporter: Tommaso Teofili
> Assignee: Tommaso Teofili
> Fix For: master (7.0)
>
>
> It'd be good to use BM25 as default {{Similarity}} for KNN classifier.
> Having done some tests on the _20newsgroups_ dataset that resulted in
> improved _f1_ (between 0.10 and 0.15).
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