Github user feynmanliang commented on the pull request:

    https://github.com/apache/spark/pull/7538#issuecomment-123059226
  
    Made a first pass.
    
    Maybe it might make sense to make a `HasSummary` trait with the 
`hasSummary` and `setSummary` logic for `*Model`s to mix-in? Then we can 
introduce a `ModelSummary` trait implemented by all the summary objects.


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