benchmark

8a7d09d1 - seperate atol and rtol in correct check and read tol from os.env (#1072)

seperate atol and rtol in correct check and read tol from os.env (#1072) Summary: Some backends may not have enough precision for some tests, so can we add these environment variables("TORCHBENCH_ATOL" and "TORCHBENCH_RTOL") to dynamicly contol tolerance of correctness_check？ Pull Request resolved: https://github.com/pytorch/benchmark/pull/1072 Reviewed By: FindHao Differential Revision: D38437225 Pulled By: xuzhao9 fbshipit-source-id: f0ee653347484ec8d96233c10364427f4d6f90eb