Add count_include_pad for avg_pool on CuDNN (#16100)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16100
Add count_include_pad for avg_pool on CuDNN
Reviewed By: houseroad
Differential Revision: D13707959
fbshipit-source-id: 261f5d116066fef75cf9a5787dfbc5d12b5b9f9b
