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

    https://github.com/apache/spark/pull/18428#discussion_r125175405
  
    --- Diff: 
mllib/src/test/scala/org/apache/spark/ml/tuning/TrainValidationSplitSuite.scala 
---
    @@ -160,8 +213,21 @@ class TrainValidationSplitSuite
       }
     }
     
    -object TrainValidationSplitSuite {
    -
    +object TrainValidationSplitSuite extends SparkFunSuite{
    +  /**
    +   * Assert sequences of estimatorParamMaps are identical.
    +   * Params must be simple types comparable with `===`.
    +   */
    +  def compareParamMaps(pMaps: Array[ParamMap], pMaps2: Array[ParamMap]): 
Unit = {
    --- End diff --
    
    If this is the same as in CrossValidatorSuite, then can you please move 
them to a shared file (maybe ValidatorParamsSuite)?


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