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https://issues.apache.org/jira/browse/SPARK-3159?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Seth Hendrickson resolved SPARK-3159.
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Resolution: Fixed
Fix Version/s: 2.4.0
> Check for reducible DecisionTree
> --------------------------------
>
> Key: SPARK-3159
> URL: https://issues.apache.org/jira/browse/SPARK-3159
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Reporter: Joseph K. Bradley
> Priority: Minor
> Fix For: 2.4.0
>
>
> Improvement: test-time computation
> Currently, pairs of leaf nodes with the same parent can both output the same
> prediction. This happens since the splitting criterion (e.g., Gini) is not
> the same as prediction accuracy/MSE; the splitting criterion can sometimes be
> improved even when both children would still output the same prediction
> (e.g., based on the majority label for classification).
> We could check the tree and reduce it if possible after training.
> Note: This happens with scikit-learn as well.
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