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https://issues.apache.org/jira/browse/SPARK-3041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14097564#comment-14097564
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Apache Spark commented on SPARK-3041:
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User 'jkbradley' has created a pull request for this issue:
https://github.com/apache/spark/pull/1950
> DecisionTree: isSampleValid indexing incorrect
> ----------------------------------------------
>
> Key: SPARK-3041
> URL: https://issues.apache.org/jira/browse/SPARK-3041
> Project: Spark
> Issue Type: Bug
> Components: MLlib
> Affects Versions: 1.1.0
> Reporter: Joseph K. Bradley
> Assignee: Joseph K. Bradley
>
> In DecisionTree, isSampleValid treats unordered categorical features
> incorrectly: It treated the bins as if indexed by featured values, rather
> than by subsets of values/categories.
> This bug is exhibited for unordered features (multi-class classification with
> categorical features of low arity).
> Proposed fix: Index bins correctly for unordered categorical features.
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