Github user jkbradley commented on a diff in the pull request: https://github.com/apache/spark/pull/19208#discussion_r150619215 --- Diff: mllib/src/main/scala/org/apache/spark/ml/tuning/TrainValidationSplit.scala --- @@ -177,7 +202,9 @@ class TrainValidationSplit @Since("1.5.0") (@Since("1.5.0") override val uid: St } @Since("2.0.0") - override def write: MLWriter = new TrainValidationSplit.TrainValidationSplitWriter(this) + override def write: TrainValidationSplit.TrainValidationSplitWriter = { --- End diff -- Was this meant to be for TrainValidationSplitModel, not the Estimator?
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