Yes I tried to launch your program, and effectively my GPU works very well. But I have another, what is your system config, as you can see above, I have a good system and sometimes I think that it’s very slow! For example, when I run the script about the TRANSFER LEARNING tutorial, normaly, the program ends in 1min30 but me, it works during 5 min minimum!!!  I don’t think that we can obtain a difference like this between a PyTorch Tutorial and my reality 
https://pytorch.org/tutorials/beginner/transfer_learning_tutorial.html 45
This is the link, and you can download the script at the end of the page 
Thanks a lot