Remove niter for models (#1054)
Summary:
We should remove niter and use the runner to control number of iterations.
Fixes https://github.com/pytorch/benchmark/issues/1023
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1054
Reviewed By: wconstab
Differential Revision: D38118869
Pulled By: xuzhao9
fbshipit-source-id: 7197125e372ac2ace92b1e200f72f31677d1085e
