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https://issues.apache.org/jira/browse/SPARK-9962?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14724096#comment-14724096
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Apache Spark commented on SPARK-9962:
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User 'holdenk' has created a pull request for this issue:
https://github.com/apache/spark/pull/8541
> Decision Tree training: prevNodeIdsForInstances.unpersist() at end of training
> ------------------------------------------------------------------------------
>
> Key: SPARK-9962
> URL: https://issues.apache.org/jira/browse/SPARK-9962
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Reporter: Joseph K. Bradley
> Priority: Minor
>
> NodeIdCache: prevNodeIdsForInstances.unpersist() needs to be called at end of
> training.
> This applies to both the ML and MLlib implementations, but it is Ok to skip
> the MLlib implementation since it will eventually be replaced by the ML one.
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