Github user wangmiao1981 commented on the pull request:
https://github.com/apache/spark/pull/12560#issuecomment-214474647
@MLnick Yanbo does not like the change of train() API. The new parameter is
optional, so the user of train should not be aware of this change. In addition,
I think ML user should use fit instead of using train directly. I am not sure
how the Developer API is used by developers. Any comments/suggestions?
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