Traceback (most recent call last):


 "/usr/local/lib/python3.6/dist-packages/torch_xla/distributed/xla_multiprocessing.py", line 330, in _mp_start_fn

_start_fn(index, pf_cfg, fn, args)


 "/usr/local/lib/python3.6/dist-packages/torch_xla/distributed/xla_multiprocessing.py", line 324, in _start_fn

fn(gindex, *args)


 "/content/transformers/examples/seq2seq/finetune_trainer.py", line 300, in _mp_fn

main()


 "/content/transformers/examples/seq2seq/finetune_trainer.py", line 249, in main

model_path=model_args.model_name_or_path if os.path.isdir(model_args.model_name_or_path) else None


 "/usr/local/lib/python3.6/dist-packages/transformers/trainer.py", line 776, in train

tr_loss += self.training_step(model, inputs)


 "/usr/local/lib/python3.6/dist-packages/transformers/trainer.py", line 1128, in training_step

loss.backward()


 "/usr/local/lib/python3.6/dist-packages/torch/tensor.py", line 221, in backward

torch.autograd.backward(self, gradient, retain_graph, create_graph)


 "/usr/local/lib/python3.6/dist-packages/torch/autograd/__init__.py", line 132, in backward

allow_unreachable=True)
# allow_unreachable flag
RuntimeError: Cannot access data pointer of Tensor that doesn't have storage

Traceback (most recent call last):


 "/tmp/kitchen/testing/tests/support/mixins.py", line 374, in wrapper

type(module)
RuntimeError: The dictionary keys returned by MandrillModuleTest.setup_loader_modules() must be an imported module, not <class 'str'>
