Tommaso Teofili created LUCENE-7591:
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Summary: Let DatasetSplitter approximate no. of class values by
no. of terms
Key: LUCENE-7591
URL: https://issues.apache.org/jira/browse/LUCENE-7591
Project: Lucene - Core
Issue Type: Improvement
Components: modules/classification
Reporter: Tommaso Teofili
Assignee: Tommaso Teofili
Fix For: master (7.0)
Currently {{DatasetSplitter}} throws an exception if it's not possible to find
{{SortedDocValues}} or {{SortedSetDocValues}} on the class field as it wouldn't
be possible to correctly split the indexes in a balanced way.
As a fallback we could instead use the no. of terms per leaf reader as an
approximate count (upper bound) to the no. of classes.
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