Github user BryanCutler commented on a diff in the pull request:
    --- Diff: python/pyspark/ml/ ---
    @@ -263,7 +284,8 @@ def _fit_java(self, dataset):
         def _fit(self, dataset):
             java_model = self._fit_java(dataset)
    -        return self._create_model(java_model)
    +        model = self._create_model(java_model)
    +        return self._copyValues(model)
    --- End diff --
    This is the crucial line being added in this PR.  Without this, if a Python 
model defines a param (matching one from Scala), then when the model is fit in 
Scala that param value will never be sent back to Python.

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