Compare shapes of outputs and grad_outputs in autograd.grad (#25349)
Summary:
PR to compare shapes of `outputs` and `grad_outputs` in `torch.autograd.grad()`.
> grad_outputs should be a sequence of length matching output containing the pre-computed gradients w.r.t. each of the outputs.
resolve https://github.com/pytorch/pytorch/issues/17893
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25349
Differential Revision: D17119931
Pulled By: CamiWilliams
fbshipit-source-id: 86c9089e240ca0cea5f4ea8ec7bcff95f9d8cf53
