Github user jkbradley commented on the pull request: https://github.com/apache/spark/pull/2607#issuecomment-58984290 I think the basis of this was that users can have a hard time remembering the order of arguments when there are a large number of arguments. Parameter classes (like the DT Strategy class) are a good fix; would that work? The train() methods which take all possible parameters get a bit unwieldy.
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