Better handling of net errors in prof_dag counters (#17384)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17384
Better handling of possible net run errors in prof_dag counters.
Reviewed By: yinghai
Differential Revision: D14177619
fbshipit-source-id: 51bc952c684c53136ce97e22281b1af5706f871e
