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Summary:
Release a new version of Opacus
Furthermore, we replace "opt_einsum.contract" by torch.einsum to avoid errors when "opt_einsum" is not available. This will not hurt the performance since torch will automatically shift to "opt_einsum" for acceleratiton when the package is available (https://pytorch.org/docs/stable/generated/torch.einsum.html)
Code pointer: https://pytorch.org/docs/stable/_modules/torch/backends/opt_einsum.html#is_available
Differential Revision: D60672828