Remove the use of niter in the model code (#1171)
Summary:
To get more consistent results with torchdynamo's benchmark script, let's completely deprecate the niter argument.
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1171
Reviewed By: wconstab
Differential Revision: D39391995
Pulled By: xuzhao9
fbshipit-source-id: 7317efc6e422f65540a52a8421eccd075d4d02fb
