torch = 0.4.0
After running for about 1 hour, the process seems freeze with no output.  What are the possible reasons?
+-------------------------------+----------------------+----------------------+
|   6  TITAN Xp            On   | 00000000:0E:00.0 Off |                  N/A |
| 23%   30C    P8    15W / 250W |  12011MiB / 12196MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+