CachingNaiveBayesClassifier doesn't compute log prior. [LUCENE-7672]

[asfimport]

The CachingNaiveBayesClassifier gives different results than the SimpleNaiveBayesClassifier. This is due to the fact that the CachineNaiveBayesClassifier does not calculate the log prior on the class (category) names, as it should.

This bug has been fixed, and a patch has been attached to this issue.

This affects master, as well as previous releases up to version 6.4.

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Migrated from LUCENE-7672 by Kevin Crosby, updated Jul 19 2020
Attachments: LUCENE-7672.patch

[asfimport]

ASF GitHub Bot (migrated from JIRA)

GitHub user QuasiChameleon opened a pull request:

https://github.com/apache/lucene-solr/pull/152

Added log prior calculations in CachingNaiveBayesClassifier.

Jira issue : [LUCENE-7672](https://issues.apache.org/jira/browse/LUCENE-7672)

You can merge this pull request into a Git repository by running:

$ git pull https://github.com/QuasiChameleon/lucene-solr master

Alternatively you can review and apply these changes as the patch at:

https://github.com/apache/lucene-solr/pull/152.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 `#152`

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commit 4d2d6c91fcd1eb8214ac3c9e5ec8a2c07d0d0374
Author: Kevin Crosby <kevin@resolvity.com>
Date: 2017-01-31T18:05:20Z

Added log prior calculations in CachingNaiveBayesClassifier.

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[asfimport]

Kevin Crosby (migrated from JIRA)

Note that my patch repository was renamed to https://github.com/KevinLeeCrosby/lucene-solr