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https://issues.apache.org/jira/browse/SPARK-3207?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiangrui Meng resolved SPARK-3207.
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Resolution: Fixed
Fix Version/s: 1.2.0
Issue resolved by pull request 2780
[https://github.com/apache/spark/pull/2780]
> Choose splits for continuous features in DecisionTree more adaptively
> ---------------------------------------------------------------------
>
> Key: SPARK-3207
> URL: https://issues.apache.org/jira/browse/SPARK-3207
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Reporter: Joseph K. Bradley
> Assignee: Qiping Li
> Priority: Minor
> Fix For: 1.2.0
>
>
> DecisionTree splits on continuous features by choosing an array of values
> from a subsample of the data.
> Currently, it does not check for identical values in the subsample, so it
> could end up having multiple copies of the same split. This is not an error,
> but it could be improved to be more adaptive to the data.
> Proposal: In findSplitsBins, check for identical values, and do some
> searching in order to find a set of unique splits. Reduce the number of
> splits if there are not enough unique candidates.
> This would require modifying findSplitsBins and making sure that the number
> of splits/bins (chosen adaptively) is set correctly elsewhere in the code
> (such as in DecisionTreeMetadata).
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