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Posted to dev@lucene.apache.org by "ASF subversion and git services (JIRA)" <ji...@apache.org> on 2016/04/11 10:12:25 UTC
[jira] [Commented] (LUCENE-7196) DataSplitter should be providing
class centric doc sets in all generated indexes
[ https://issues.apache.org/jira/browse/LUCENE-7196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15234669#comment-15234669 ]
ASF subversion and git services commented on LUCENE-7196:
---------------------------------------------------------
Commit 112078eaf909bdda27a092d13a8431c046a82ac0 in lucene-solr's branch refs/heads/master from [~teofili]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=112078e ]
LUCENE-7196 - guaranteed class coverage in split indexes through grouping by class
> 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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