I have rebooted my server, but still some strange errors occur occasionally
like ‘RuntimeError: cuda runtime error (4) : unspecified launch failure at /home/soumith/local/builder/wheel/pytorch-src/torch/lib/THC/generic/THCTensorCopy.c:18’.
And when I ran ‘nvidia-smi’ sometimes it’s extremely slow…
Thanks for your replying  now I won’t commit the same mistake again.