Pytorch exampleのsuper resolutionのサンプルを動かそうとしたらエラーがでた。

$ pip install torch torchvision
$  python main.py --upscale_factor 3 --batchSize 4 --testBatchSize 100 --nEpochs 30 --lr 0.001

エラー内容

Traceback (most recent call last):
  File "main.py", line 81, in <module>
    train(epoch)
  File "main.py", line 48, in train
    for iteration, batch in enumerate(training_data_loader, 1):
  File "/Users/xxx/.pyenv/versions/3.7.4/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 819, in __next__
    return self._process_data(data)
  File "/Users/xxx/.pyenv/versions/3.7.4/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 846, in _process_data
    data.reraise()
  File "/Users/xxx/.pyenv/versions/3.7.4/lib/python3.7/site-packages/torch/_utils.py", line 385, in reraise
    raise self.exc_type(msg)
RuntimeError: Caught RuntimeError in DataLoader worker process 0.
Original Traceback (most recent call last):
  File "/Users/xxx/.pyenv/versions/3.7.4/lib/python3.7/site-packages/torch/utils/data/_utils/worker.py", line 178, in _worker_loop
    data = fetcher.fetch(index)
  File "/Users/xxx/.pyenv/versions/3.7.4/lib/python3.7/site-packages/torch/utils/data/_utils/fetch.py", line 47, in fetch
    return self.collate_fn(data)
  File "/Users/xxx/.pyenv/versions/3.7.4/lib/python3.7/site-packages/torch/utils/data/_utils/collate.py", line 79, in default_collate
    return [default_collate(samples) for samples in transposed]
  File "/Users/xxx/.pyenv/versions/3.7.4/lib/python3.7/site-packages/torch/utils/data/_utils/collate.py", line 79, in <listcomp>
    return [default_collate(samples) for samples in transposed]
  File "/Users/xxx/.pyenv/versions/3.7.4/lib/python3.7/site-packages/torch/utils/data/_utils/collate.py", line 53, in default_collate
    storage = elem.storage()._new_shared(numel)
  File "/Users/xxx/.pyenv/versions/3.7.4/lib/python3.7/site-packages/torch/storage.py", line 128, in _new_shared
    return cls._new_using_filename(size)
RuntimeError: error executing torch_shm_manager at "/Users/xxx/.pyenv/versions/3.7.4/lib/python3.7/site-packages/torch/bin/torch_shm_manager" at ../torch/lib/libshm/core.cpp:99

/Users/xxx/.pyenv/versions/3.7.4/lib/python3.7/site-packages/torch/bin/torch_shm_managerに実行権限がなかったので、以下のコマンドで実行権限を付与するとよい。

$  chmod +x /Users/xxx/.pyenv/versions/3.7.4/lib/python3.7/site-packages/torch/bin/torch_shm_manager