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https://issues.apache.org/jira/browse/SPARK-4998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14260789#comment-14260789
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Liu Jiongzhou commented on SPARK-4998:
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I have make a PR to solve this issue.
https://github.com/apache/spark/pull/3836
> "train" methods in object DecisionTree cannot work when using java reflection
> -----------------------------------------------------------------------------
>
> Key: SPARK-4998
> URL: https://issues.apache.org/jira/browse/SPARK-4998
> Project: Spark
> Issue Type: Bug
> Components: MLlib
> Affects Versions: 1.2.0
> Reporter: Liu Jiongzhou
>
> When using the Java reflection, the several "train" methods defined in
> "object DecisionTree" cannot be identified due to the function with the same
> name in "class DecisionTree".
> Since the namesake "train" method in class DecisionTree" has already been a
> deprecated one, it should be commit out to make the "train" methods in
> "object DecisionTree" effective.
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