Missing RobertaForMultipleChoice
Hi,
It seems like a `RobertaForMultipleChoice` class should exist to parallel `BertForMultipleChoice`. Or was there a particular reason it was elided? 
Hi @malmaud, no particular reason. But it's also super easy to just implement your own classifier on top of the model (and then you have full control)<|||||>This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.
