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https://issues.apache.org/jira/browse/LUCENE-7196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15234672#comment-15234672
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ASF subversion and git services commented on LUCENE-7196:
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Commit ff3661abdaa5b4ae33496dc378ae917f7a7a723b in lucene-solr's branch
refs/heads/branch_6x from [~teofili]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=ff3661a ]
LUCENE-7196 - guaranteed class coverage in split indexes through grouping by
class
(cherry picked from commit 112078e)
> DataSplitter should be providing class centric doc sets in all generated
> indexes
> --------------------------------------------------------------------------------
>
> Key: LUCENE-7196
> URL: https://issues.apache.org/jira/browse/LUCENE-7196
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/classification
> Reporter: Tommaso Teofili
> Assignee: Tommaso Teofili
> Priority: Minor
> Fix For: 6.1
>
>
> {{DataSplitter}} currently creates 3 indexes (train/test/cv) out of an
> _original_ index for evaluation of {{Classifiers}} however "class coverage"
> in such generated indexes is not guaranteed; that means e.g. in _training
> index_ only documents belonging to 50% of the class set could be indexed and
> hence classifiers may not be very effective. In order to provide more
> consistent evaluation the generated index should contain _ split-ratio * |
> docs in c |_ documents for each class _c_.
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