@hjung although you are getting True for torch.cuda.is_available(), without underlying nvidia drivers you will be unable to use it for tensor operations
There is an older thread discussing the same thing
  
    
    
    Is it required to set-up CUDA on PC before installing CUDA enabled pytorch? 
  
  
    Can I simply go to pytorch website and use the following link to download a CUDA enabled pytorch library ? Or do i have to set up the CUDA on my device first, before installing the  CUDA enabled pytorch ? 
pip3 install torch===1.3.0 torchvision===0.4.1 -f https://download.pytorch.org/whl/torch_stable.html