srowen commented on pull request #28503:
URL: https://github.com/apache/spark/pull/28503#issuecomment-628669711


   Am I right that currently, this would fail if you fit a multi-class model 
and then tried to call one of the methods on BinaryLogisticRegressionSummary, 
like roc()? because the Scala impl on the other side would not be a 
BinaryLogisticRegressionSummary and would not have that method?
   
   If so that's almost not a behavior change, as nothing that this change 
'takes away' would have worked.


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