torch.autograd.function._ContextMethodMixin.save_for_backward

_ContextMethodMixin.save_for_backward(*tensors)

Saves given tensors for a future call to backward().

This should be called at most once, and only from inside the forward() method.

Later, saved tensors can be accessed through the saved_tensors attribute. Before returning them to the user, a check is made to ensure they weren’t used in any in-place operation that modified their content.

Arguments can also be None.