GitHub user javanna opened a pull request:
https://github.com/apache/lucene-solr/pull/511
Remove k1+1 from the numerator of BM25Similarity
Patch for https://issues.apache.org/jira/browse/LUCENE-8563.
This PR removes the k1+1 factor from the numerator of `BM25Similarity` and
adds a new `LegacyBM25Similarity` under misc that exposes the old behaviour.
Note that I haven't found a way to easily reproduce the previous behaviour in
the explain method, so I left that part out of `LegacyBM25Similarity` for now.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/javanna/lucene-solr
lucene-8563_bm25_k1_numerator
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/lucene-solr/pull/511.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #511
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commit c665ed04b94f330fe27deec781cc1c59d45fddb5
Author: javanna <cavannaluca@...>
Date: 2018-11-14T09:51:48Z
Remove k1+1 constant factor from BM25 formula numerator
commit 1b3714410771b53d30f29c78f27c37c617dea85c
Author: javanna <cavannaluca@...>
Date: 2018-11-14T11:15:39Z
adapt TestFunctionQuery
commit 7f56226906ededdc285877c429a00dae4f5a6d10
Author: javanna <cavannaluca@...>
Date: 2018-11-14T14:08:38Z
adapt TestPayloadScoreQParserPlugin
commit 870d1d79afef7800ec348fabbe7b14b1a11ae1c0
Author: javanna <cavannaluca@...>
Date: 2018-11-14T16:32:53Z
add migrate note
commit 5f0a0b0fb0ec7ebad8094f7fa97a09c877d3a1cb
Author: javanna <cavannaluca@...>
Date: 2018-11-27T21:15:12Z
add LegacyBM25Similarity
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