tvalentyn commented on code in PR #29542:
URL: https://github.com/apache/beam/pull/29542#discussion_r1412682744


##########
sdks/python/apache_beam/ml/transforms/handlers.py:
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@@ -201,6 +198,8 @@ class MergeDicts(beam.DoFn):
   def process(self, element):
     _, element = element
     new_dict = {}
+    # Assertion could fail due to UUID collision.

Review Comment:
   @AnandInguva please check that this condition makes sense. In particular, 
are there exactly two elements per key or two elements per each transformation?



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