Github user zapletal-martin commented on the pull request:

    https://github.com/apache/spark/pull/7337#issuecomment-120394394
  
    @feynmanliang yes there is a lot of duplicated code. I attempted to 
refactor that slightly under https://github.com/apache/spark/pull/6996. 
    
    It is an interesting idea to just call CrossValidator instead of 
implementing the logic. I will have a look into that. But I assume we still 
need the Params and Model specific for TrainValidationSplit? We also need to 
decide if we want to do that as part of this review or separately.
    
    cc @mengxr 


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