Github user MrBago commented on a diff in the pull request:
https://github.com/apache/spark/pull/18888#discussion_r132560721
--- Diff: python/pyspark/ml/pipeline.py ---
@@ -130,13 +131,20 @@ def copy(self, extra=None):
@since("2.0.0")
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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