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

    https://github.com/apache/spark/pull/6392#discussion_r31084468
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala ---
    @@ -102,12 +102,6 @@ class CrossValidator(override val uid: String) extends 
Estimator[CrossValidatorM
       /** @group setParam */
       def setNumFolds(value: Int): this.type = set(numFolds, value)
     
    -  override def validateParams(paramMap: ParamMap): Unit = {
    --- End diff --
    
    Sorry, I should have been clearer: CrossValidator still needs to call 
validateParams() for each of the estimatorParamMaps.  It should copy the 
estimator with each paramMap, and then call validateParams for that copy.


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