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[skip-ci] Fixed get_perf in jacobians_hessians #598
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https://pytorch.org/functorch/stable/notebooks/jacobians_hessians.html#reverse-mode-jacobian-jacrev-vs-forward-mode-jacobian-jacfwd
jacfwdis faster thenjacrevbut message says the opposite.This PR just fixes the definition but not fixes the output. I can do that manually later...