Allow tuples for scale_factor argument in nn.Upsample (#20581)
Summary:
Fixes #20523 .
nn.Upsample was unable to accept tuple inputs for the scale_factor argument due to direct casting to float, which was done in #17732.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20581
Differential Revision: D15392622
Pulled By: ezyang
fbshipit-source-id: b56ba8197a5bbf8891bc7e1bebf5cad63dcab04d
