This is most likely the torch 1.0.1 hang issue.
To falsify that can you please do a ‘conda list’ and report back the pytorch version?
If it is pytorch 1.0.1 please do conda uninstal pytorch followed by conda install pytorch==1.0.0 - that should get rid of the hang.
In antly case it’s currently filed here. I should get to in a day or 2 but if someone else has spare cycles they are welcome to take it up.