Github user jkbradley commented on the pull request:

    https://github.com/apache/spark/pull/3975#issuecomment-70897863
  
    @mengxr  I agree that setup is simplest, in that it makes users consciously 
handle all re-labeling explicitly.  I'm OK with it if we add data validation at 
the start of each algorithm (or in a try-except block which then does data 
validation when an exception is thrown).


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