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https://issues.apache.org/jira/browse/SPARK-22949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joseph K. Bradley resolved SPARK-22949.
---------------------------------------
          Resolution: Fixed
       Fix Version/s: 2.4.0
                      2.3.0
    Target Version/s: 2.3.0, 2.4.0

Resolved by https://github.com/apache/spark/pull/20143

> Reduce memory requirement for TrainValidationSplit
> --------------------------------------------------
>
>                 Key: SPARK-22949
>                 URL: https://issues.apache.org/jira/browse/SPARK-22949
>             Project: Spark
>          Issue Type: Bug
>          Components: ML
>    Affects Versions: 2.3.0
>            Reporter: Bago Amirbekian
>            Assignee: Bago Amirbekian
>            Priority: Critical
>             Fix For: 2.3.0, 2.4.0
>
>
> There was a fix in {{ CrossValidator }} to reduce memory usage on the driver, 
> the same patch to be applied to {{ TrainValidationSplit }}.



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