benchmark

d0644b33 - reduce torchbench mimo_cmf_30x TAT

reduce torchbench mimo_cmf_30x TAT Summary: apply a few optimizations to reduce turn-around time of torchbench tests Reviewed By: luccafong Differential Revision: D49822587 fbshipit-source-id: 9b9bb471ae77cda789478406052e711ceb5a6728