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https://issues.apache.org/jira/browse/SPARK-16307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15355896#comment-15355896
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Apache Spark commented on SPARK-16307:
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User 'MechCoder' has created a pull request for this issue:
https://github.com/apache/spark/pull/13981
> Improve testing for DecisionTree variances
> ------------------------------------------
>
> Key: SPARK-16307
> URL: https://issues.apache.org/jira/browse/SPARK-16307
> Project: Spark
> Issue Type: Test
> Reporter: Manoj Kumar
> Priority: Minor
>
> The current test assumes that Impurity.calculate() returns the variance
> correctly. A better approach would be to test if the variance returned equals
> the variance that we can manually verify on a toy data and tree.
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