Github user MrBago commented on a diff in the pull request:
    --- Diff: python/pyspark/ml/ ---
    @@ -130,13 +131,20 @@ def copy(self, extra=None):
         def write(self):
             """Returns an MLWriter instance for this ML instance."""
    -        return JavaMLWriter(self)
    +        allStagesAreJava = True
    +        stages = self.getStages()
    +        for stage in stages:
    +            if not isinstance(stage, JavaMLWritable):
    +                allStagesAreJava = False
    --- End diff --
    How about `allStagesAreJava = all(isinstance(stage, JavaMLWritable) for 
stage in self.getStages())`

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