export group_norm (#27071)
Summary:
Updated group_norm symbolic
Pull Request resolved: https://github.com/pytorch/pytorch/pull/27071
Reviewed By: hl475
Differential Revision: D17792249
Pulled By: houseroad
fbshipit-source-id: 08be6071952ca2c256d2c6a0a6bbc19a8442f1fe
