Have softmax handle any dim via permutation #832
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Summary:
Since the backend doesn't yet support reduction over non-last-dimensions, I'm
having the frontend add two permute ops to move the desired dimension to the
end of the shape.
I considered modifying the softmax template code instead of creating new op
instances, but the
permute()
op has a bunch of logic for dispatching to morespecialized versions of itself, and it seems the easiest way to take advantage
of that is by creating instances of the permute op.
Differential Revision: D47506000