Fix broken ci from gpt2_large (#1230)
Summary:
The trunk ci is broken because gpt2_large test returns exit code 9 (Out-of-memory).
This PR skips the cpu train test for GPT2_large
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1230
Reviewed By: davidberard98
Differential Revision: D40089160
Pulled By: davidberard98
fbshipit-source-id: 4f9346ee4234d4fe10b3fcf44de1c8628d090d2a
