Github user WeichenXu123 commented on a diff in the pull request:
    --- Diff: python/pyspark/ml/ ---
    @@ -204,13 +282,20 @@ def copy(self, extra=None):
         def write(self):
             """Returns an MLWriter instance for this ML instance."""
    -        return JavaMLWriter(self)
    +        allStagesAreJava = True
    +        stages = self.stages
    +        for stage in stages:
    +            if not isinstance(stage, JavaMLWritable):
    +                allStagesAreJava = False
    +        if allStagesAreJava:
    +            return JavaMLWriter(self)
    --- End diff --
    I find the similar logic twice, can you move it to a util function ?

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