[jira] [Assigned] (LUCENE-7196) DataSplitter should be providing class centric doc sets in all generated indexes

["Tommaso Teofili (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7196?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tommaso Teofili reassigned LUCENE-7196:
---------------------------------------

    Assignee: Tommaso Teofili

> 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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