Github user jkbradley commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16009#discussion_r90088312
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/ml/feature/ChiSqSelector.scala ---
    @@ -49,15 +49,13 @@ private[feature] trait ChiSqSelectorParams extends 
Params
        *
        * @group param
        */
    -  @Since("1.6.0")
    --- End diff --
    
    In this case, I think it's OK to have Since annotations in the trait since 
it is private and should never be used beyond ChiSqSelector and 
ChiSqSelectorModel.  That seems pretty safe to me.


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