Github user sabhyankar commented on the pull request:

    https://github.com/apache/spark/pull/8241#issuecomment-134806330
  
    @feynmanliang without the ClassTag, the compiler complains that no ClassTag 
is available for our type T.
    
    No ClassTag available for T
    [error]       case None => bcModel = Some(sc.broadcast(modelToBc))
    
    Another unrelated question I have is that there is no common trait for the 
models under mllib so what would I upperbound the type T in the trait?



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