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https://issues.apache.org/jira/browse/SPARK-9622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14680510#comment-14680510
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Joseph K. Bradley commented on SPARK-9622:
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OK, before you do though, it'd be worth discussing how those variances should
be returned. E.g., just a Double column of variances? Pros: Simple,
applicable to other distributions if we ever move beyond Variance (=Gaussian)
as an impurity. Cons: Not extensible if we use other distributions and want to
return more details about the distribution.
Those are my thoughts. Currently, a Double column of variances seems best to
me. But it'd be nice to hear your thoughts.
> DecisionTreeRegressor: provide variance of prediction
> -----------------------------------------------------
>
> Key: SPARK-9622
> URL: https://issues.apache.org/jira/browse/SPARK-9622
> Project: Spark
> Issue Type: Sub-task
> Components: ML
> Reporter: Joseph K. Bradley
> Priority: Minor
>
> Variance of predicted value, as estimated from training data.
> Analogous to class probabilities for classification.
> See [SPARK-3727] for discussion.
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