C++ parity, nn::CrossMapLRN2d (#29039)
Summary:
yf225 https://github.com/pytorch/pytorch/issues/25883
re- pull request because of rebase mistake!
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29039
Differential Revision: D18326829
Pulled By: yf225
fbshipit-source-id: 5ed737f6275e4463efa4951d9b7f45c6f2723c82
