P.grad.grad_fn is None and p.grad.requires_grad = True

autograd
1

Hi @ptrblck @albanD et al.,

May I ask in which case it will go into this else branch, i.e., p.grad.grad_fn is None and p.grad.requires_grad = True? I understand requires_grad will be True if grad_fn is not None, e.g., create_graph turned on in autograd.grad.

The source snippet is optim.optimizer.zero_grad.

image

Thanks.