Ubuntu installation and configuration nvidia driver, cuda, pytorch

1. Download these three packages first:
   cuda 11.1
   pytorch cu111 py38
   nvidia driver

2. Install the nVidia driver first. You can also do
   this https://blog.csdn.net/qq_41481731/article/details/86640170 (remember to add execution permissions)
   sudo ./NVIDIA-Linux-x86_64-470.86.run

3. Install cuda
   directly like this ./cuda_11.1.0_455.23.05_linux.run(remember to add execution permissions)
   and then configure the environment variables as required:

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/cuda-11.1/lib64
export PATH=$PATH:/usr/local/cuda-11.1/bin
export CUDA_HOME=$CUDA_HOME:/usr/local/cuda-11.1

4. Install pytorch
   pip install ./torch-1.8.2+cu111-cp38-cp38-linux_x86_64.whl