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* replace autograd.grad with autograd.backward
Signed-off-by: Robin Zhang <robinz@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci



* get/set graphable rng state
Signed-off-by: Robin Zhang <robinz@nvidia.com>

* fix lint
Signed-off-by: Robin Zhang <robinz@nvidia.com>

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Signed-off-by: Robin Zhang <robinz@nvidia.com>
Co-authored-by: Kirthi Shankar Sivamani <ksivamani@nvidia.com>