How to check if pytorch is using the GPU?

Question

I would like to know if pytorch is using my GPU. It\'s possible to detect with nvidia-smi if there is any activity from the GPU during the process,

Answer 1

Create a tensor on the GPU as follows:

$ python
>>> import torch
>>> print(torch.rand(3,3).cuda()) 

Do not quit, open another terminal and check if the python process is using the GPU using:

$ nvidia-smi