this seems like a bug, I opened an issue here: https://github.com/pytorch/pytorch/issues/15511 9
Would you mind running
wget https://raw.githubusercontent.com/pytorch/pytorch/master/torch/utils/collect_env.py
# For security purposes, please check the contents of collect_env.py before running it.
python collect_env.py

and then paste the results of your environment in the issue linked above?