Github user mengxr commented on the pull request:

    https://github.com/apache/spark/pull/9169#issuecomment-151374915
  
    This looks good to me. Btw, we haven't yet discussed the exact semantic of 
`@Experimental`. I think we haven't made any break changes on `@Experimental` 
APIs without deprecating them first in MLlib since 1.0. Then they are basically 
the same as stable methods. Does `@Experimental` mean having a better chance to 
be deprecated? If we don't know the exact semantic, most users/developers would 
be confused by the `@Experimental` tag.


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