ValueError: bad value(s) in fds_to_keep

[siyangbing]

Hello, I encountered a problem when using the official video classification example. I want to ask you whether you have successfully trained video classification! My error is as follows. Thank you so much if you can help me

Traceback (most recent call last):
File "/home/sucom/hdd_1T/project/video_rec/my_video_rec/self_video.py", line 152, in
trainer.train(task)
File "/home/sucom/.conda/envs/classy_vision/lib/python3.6/site-packages/classy_vision/trainer/local_trainer.py", line 27, in train
super().train(task)
File "/home/sucom/.conda/envs/classy_vision/lib/python3.6/site-packages/classy_vision/trainer/classy_trainer.py", line 45, in train
task.on_phase_start()
File "/home/sucom/.conda/envs/classy_vision/lib/python3.6/site-packages/classy_vision/tasks/classification_task.py", line 1107, in on_phase_start
self.advance_phase()
File "/home/sucom/.conda/envs/classy_vision/lib/python3.6/site-packages/classy_vision/tasks/classification_task.py", line 1009, in advance_phase
self.create_data_iterator()
File "/home/sucom/.conda/envs/classy_vision/lib/python3.6/site-packages/classy_vision/tasks/classification_task.py", line 1062, in create_data_iterator
self.data_iterator = iter(self.dataloaders[self.phase_type])
File "/home/sucom/.conda/envs/classy_vision/lib/python3.6/site-packages/torch/utils/data/dataloader.py", line 279, in iter
return _MultiProcessingDataLoaderIter(self)
File "/home/sucom/.conda/envs/classy_vision/lib/python3.6/site-packages/torch/utils/data/dataloader.py", line 721, in init
w.start()
File "/home/sucom/.conda/envs/classy_vision/lib/python3.6/multiprocessing/process.py", line 105, in start
self._popen = self._Popen(self)
File "/home/sucom/.conda/envs/classy_vision/lib/python3.6/multiprocessing/context.py", line 284, in _Popen
return Popen(process_obj)
File "/home/sucom/.conda/envs/classy_vision/lib/python3.6/multiprocessing/popen_spawn_posix.py", line 32, in init
super().init(process_obj)
File "/home/sucom/.conda/envs/classy_vision/lib/python3.6/multiprocessing/popen_fork.py", line 19, in init
self._launch(process_obj)
File "/home/sucom/.conda/envs/classy_vision/lib/python3.6/multiprocessing/popen_spawn_posix.py", line 59, in _launch
cmd, self._fds)
File "/home/sucom/.conda/envs/classy_vision/lib/python3.6/multiprocessing/util.py", line 417, in spawnv_passfds
False, False, None)
ValueError: bad value(s) in fds_to_keep

[siyangbing]

please help