AD support for adaptive_avg_pool2d (#15459)
Summary:
This adds AD support for adaptive_avg_pool2d, which is necessary for resnet50 in pytorch/vision:master. cc: soumith asuhan dlibenzi
apaszke I saw that autodiff bug you fixed in #15403 , as it doesn't prevent this PR from passing, so I'll leave it for your PR to fix it. :)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15459
Differential Revision: D13534732
Pulled By: ailzhang
fbshipit-source-id: 4e48b93e35d5ecfe7bd64b6a132a55b07843f206
