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https://issues.apache.org/jira/browse/SPARK-21623?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen reassigned SPARK-21623:
---------------------------------
Assignee: Peng Meng
> Comments of parentStats on ml/tree/impl/DTStatsAggregator.scala is wrong
> ------------------------------------------------------------------------
>
> Key: SPARK-21623
> URL: https://issues.apache.org/jira/browse/SPARK-21623
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 2.3.0
> Reporter: Peng Meng
> Assignee: Peng Meng
> Priority: Trivial
> Fix For: 2.3.0
>
>
> {code:java}
> * Note: this is necessary because stats for the parent node are not
> available
> * on the first iteration of tree learning.
> */
> private val parentStats: Array[Double] = new Array[Double](statsSize)
> {code}
> This comment is not right. Actually, parentStats is not only used for the
> first iteration. It is used with all the iteration for unordered featrues.
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