>>> torch.cuda.is_available() 
False
>>> print(torch.__version__)
1.4.0

cat /usr/local/cuda/version.txt 
CUDA Version 10.0.130

nvcc -V
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2018 NVIDIA Corporation
Built on Sat_Aug_25_21:08:01_CDT_2018
Cuda compilation tools, release 10.0, V10.0.130

My gpu is 1080Ti.
It seems like there is no use of cuda.