Tommaso Teofili created LUCENE-7776:
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Summary: 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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