Traceback (most recent call last):


 "/home/test/work/espnet/tools/venv/lib/python3.7/multiprocessing/process.py", line 297, in _bootstrap

self.run()


 "/home/test/work/espnet/tools/venv/lib/python3.7/multiprocessing/process.py", line 99, in run

self._target(*self._args, **self._kwargs)


 "/home/test/work/espnet/espnet2/tasks/abs_task.py", line 1222, in main_worker

distributed_option=distributed_option,


 "/home/test/work/espnet/espnet2/train/trainer.py", line 212, in run

options=trainer_options,


 "/home/test/work/espnet/espnet2/train/trainer.py", line 367, in train_one_epoch

reporter.measure_iter_time(iterator, "iter_time"), 1


 "/home/test/work/espnet/espnet2/train/reporter.py", line 204, in measure_iter_time

iterator = iter(iterable)


 "/home/test/work/espnet/tools/venv/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 279, in __iter__

return _MultiProcessingDataLoaderIter(self)


 "/home/test/work/espnet/tools/venv/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 719, in __init__

w.start()


 "/home/test/work/espnet/tools/venv/lib/python3.7/multiprocessing/process.py", line 112, in start

self._popen = self._Popen(self)


 "/home/test/work/espnet/tools/venv/lib/python3.7/multiprocessing/context.py", line 223, in _Popen

return _default_context.get_context().Process._Popen(process_obj)


 "/home/test/work/espnet/tools/venv/lib/python3.7/multiprocessing/context.py", line 284, in _Popen

return Popen(process_obj)


 "/home/test/work/espnet/tools/venv/lib/python3.7/multiprocessing/popen_spawn_posix.py", line 32, in __init__

super().__init__(process_obj)


 "/home/test/work/espnet/tools/venv/lib/python3.7/multiprocessing/popen_fork.py", line 20, in __init__

self._launch(process_obj)


 "/home/test/work/espnet/tools/venv/lib/python3.7/multiprocessing/popen_spawn_posix.py", line 47, in _launch

reduction.dump(process_obj, fp)


 "/home/test/work/espnet/tools/venv/lib/python3.7/multiprocessing/reduction.py", line 60, in dump

ForkingPickler(file, protocol).dump(obj)
TypeError: cannot serialize '_io.BufferedReader' object

Traceback (most recent call last):


 "/Users/mr/anaconda2/lib/python2.7/threading.py", line 801, in __bootstrap_inner

self.run()


 "/Users/mr/anaconda2/lib/python2.7/threading.py", line 754, in run

self.__target(*self.__args, **self.__kwargs)


 "/Users/mr/anaconda2/lib/python2.7/multiprocessing/pool.py", line 332, in _handle_workers

debug('worker handler exiting')
TypeError: 'NoneType' object is not callable
