Fix typo in torchvision_models.py (#53968)
Summary:
accross -> across
Pull Request resolved: https://github.com/pytorch/pytorch/pull/53968
Reviewed By: jbschlosser
Differential Revision: D27035761
Pulled By: ngimel
fbshipit-source-id: 94fac6f2e27648e70652fd29f7800e60b211acd5
