Github user taishi-oss commented on the pull request:
https://github.com/apache/spark/pull/8534#issuecomment-141008317
I think DecisionTreeClassifer.copy is introduced in v1.5.0.
but, This method is brought into v.1.4.1 using "git-cherry-pick".
So "git blames" says v.1.5.0 but "git show" says v.1.4.1.
I compare "git show" commnad's results with "git blames"'s results in
ml.classification, and then there are some differnces as desribed above.
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