Github user WeichenXu123 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/19278#discussion_r139854984
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala ---
    @@ -212,14 +213,12 @@ object CrossValidator extends 
MLReadable[CrossValidator] {
     
           val (metadata, estimator, evaluator, estimatorParamMaps) =
             ValidatorParams.loadImpl(path, sc, className)
    -      val numFolds = (metadata.params \ "numFolds").extract[Int]
    -      val seed = (metadata.params \ "seed").extract[Long]
    -      new CrossValidator(metadata.uid)
    +      val cv = new CrossValidator(metadata.uid)
             .setEstimator(estimator)
             .setEvaluator(evaluator)
             .setEstimatorParamMaps(estimatorParamMaps)
    -        .setNumFolds(numFolds)
    -        .setSeed(seed)
    +      DefaultParamsReader.getAndSetParams(cv, metadata, skipParams = 
List("estimatorParamMaps"))
    --- End diff --
    
    No. Because `estimator` and `evaluator` isn't included in metadata. You can 
check the `saveImpl`.


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