Traceback (most recent call last):


 "/usr/local/lib/python3.7/dist-packages/torch/multiprocessing/spawn.py", line 19, in _wrap

fn(i, *args)


 "/opt/tiger/fairseq/fairseq/distributed_utils.py", line 302, in distributed_main

main(cfg, **kwargs)


 "/opt/tiger/fairseq/fairseq_cli/train.py", line 138, in main

valid_losses, should_stop = train(cfg, trainer, task, epoch_itr)


 "/usr/lib/python3.7/contextlib.py", line 74, in inner

return func(*args, **kwds)


 "/opt/tiger/fairseq/fairseq_cli/train.py", line 235, in train

log_output = trainer.train_step(samples)


 "/usr/lib/python3.7/contextlib.py", line 74, in inner

return func(*args, **kwds)


 "/opt/tiger/fairseq/fairseq/trainer.py", line 536, in train_step

ignore_grad=is_dummy_batch,


 "/opt/tiger/fairseq/fairseq/tasks/fairseq_task.py", line 428, in train_step

loss, sample_size, logging_output = criterion(model, sample)


 "/usr/local/lib/python3.7/dist-packages/torch/nn/modules/module.py", line 727, in _call_impl

result = self.forward(*input, **kwargs)


 "/opt/tiger/fairseq/fairseq/criterions/cross_entropy.py", line 35, in forward

net_output = model(**sample["net_input"])


 "/usr/local/lib/python3.7/dist-packages/torch/nn/modules/module.py", line 727, in _call_impl

result = self.forward(*input, **kwargs)


 "/opt/tiger/fairseq/fairseq/legacy_distributed_data_parallel.py", line 83, in forward

return self.module(*inputs, **kwargs)


 "/usr/local/lib/python3.7/dist-packages/torch/nn/modules/module.py", line 727, in _call_impl

result = self.forward(*input, **kwargs)


 "/opt/tiger/fairseq/fairseq/models/wav2vec/wav2vec2_asr.py", line 249, in forward

decoder_out = self.decoder(encoder_out=encoder_out, **kwargs)


 "/usr/local/lib/python3.7/dist-packages/torch/nn/modules/module.py", line 727, in _call_impl

result = self.forward(*input, **kwargs)
TypeError: forward() missing 1 required positional argument: 'prev_output_tokens'

Traceback (most recent call last):


 "/home/.virtualenvs//lib/python3.5/site-packages/tensorflow/python/client/session.py", line 707, in __del__
TypeError: 'NoneType' object is not callable
