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https://issues.apache.org/jira/browse/SPARK-8468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joseph K. Bradley resolved SPARK-8468.
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Resolution: Fixed
Fix Version/s: 1.4.1
1.5.0
Issue resolved by pull request 6905
[https://github.com/apache/spark/pull/6905]
> Cross-validation with RegressionEvaluator prefers higher RMSE
> -------------------------------------------------------------
>
> Key: SPARK-8468
> URL: https://issues.apache.org/jira/browse/SPARK-8468
> Project: Spark
> Issue Type: Bug
> Components: ML
> Affects Versions: 1.4.0
> Reporter: Chelsea Zhang
> Assignee: Liang-Chi Hsieh
> Priority: Blocker
> Fix For: 1.5.0, 1.4.1
>
>
> Please correct me if I'm wrong, but RegressionEvaluator seems to implement
> the evaluate() method backwards. The interface expects higher return values
> from evaluate() to indicate better models. RegressionEvaluator returns RMSE
> by default - a value we should try to minimize.
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