Github user vectorijk commented on a diff in the pull request: https://github.com/apache/spark/pull/12767#discussion_r61507716 --- Diff: python/pyspark/ml/tuning.py --- @@ -613,7 +615,9 @@ def copy(self, extra=None): """ if extra is None: extra = dict() - return TrainValidationSplitModel(self.bestModel.copy(extra)) + bestModel = self.bestModel.copy(extra) + validationMetrics = self.validationMetrics + return TrainValidationSplitModel(bestModel, validationMetrics) --- End diff -- It would be great if you could add test case for `TrainValidationSplitModel` copy method.
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