Fix require_grad typo (#1771)
Summary:
Fix require_grad typos (should be requires_grad).
Before the fix, the code doesn't cause any errors but doesn't do what it's supposed to do.
Fixed with TorchFix https://github.com/pytorch/test-infra/tree/main/tools/torchfix
Upstream PR: https://github.com/codertimo/BERT-pytorch/pull/104
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1771
Reviewed By: xuzhao9
Differential Revision: D47531187
Pulled By: kit1980
fbshipit-source-id: 738b1866cc5cd3fedfa878cc40827236717f6f27
