Install PyTorch with CUDA enabled

install-pytorch-with-cuda.md

Check if CUDA is available by torch:

import torch

def check_cuda():
    print(torch.version.cuda)
    cuda_is_ok = torch.cuda.is_available()
    print(f"CUDA Enabled: {cuda_is_ok}")

Get CUDA version:

nvidia-smi

Sun Aug 13 01:27:00 2023
+---------------------------------------------------------------------------------------+
| NVIDIA-SMI 531.79                 Driver Version: 531.79       CUDA Version: 12.1     |
|-----------------------------------------+----------------------+----------------------+
| GPU  Name                      TCC/WDDM | Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf            Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|                                         |                      |               MIG M. |
|=========================================+======================+======================|
|   0  NVIDIA GeForce RTX 2060 S...  WDDM | 00000000:01:00.0  On |                  N/A |
| 40%   37C    P8               35W / 105W|   1762MiB /  8192MiB |     23%      Default |
|                                         |                      |                  N/A |
+-----------------------------------------+----------------------+----------------------+

So the CUDA version for our driver is 12.1. But currently (2023.08.13), the latest pytorch only supports up to CUDA 11.8, so we need to download and install an older CUDA version.

I recommend Download and Install CUDA 11.7:

• CUDA Toolkit Archive | NVIDIA Developer
  • https://developer.nvidia.com/cuda-toolkit-archive
  • https://developer.nvidia.com/cuda-11-7-0-download-archive?target_os=Windows&target_arch=x86_64&target_version=10&target_type=exe_local

Now we could use nvcc to check CUDA version:

nvcc --version

nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2022 NVIDIA Corporation
Built on Tue_May__3_19:00:59_Pacific_Daylight_Time_2022
Cuda compilation tools, release 11.7, V11.7.64
Build cuda_11.7.r11.7/compiler.31294372_0

Add following paths to environments path variables: (The installation would add them by default)

C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.7\bin
C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.7\libnvvp

Run following commands to install Python torch with CUDA enabled:

python -m pip uninstall torch
python -m pip cache purge

# Use 11.7, it should be compatible
python -m pip install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cu117

# If want to use preview version of torch with CUDA 12.1
# python -m pip install torch torchvision --pre -f https://download.pytorch.org/whl/nightly/cu121/torch_nightly.html

Issues

If torch.version.cuda always returns None, this means the installed PyTorch library was not built with CUDA support. So we need to choose another version of torch.

python -m pip install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cu117
# python -m pip install torch==2.0.0+cu117 torchvision==0.15.1+cu117 torchaudio==2.0.1 --index-url https://download.pytorch.org/whl/cu117

Or your CUDA version is too new that torch has not supported, so you need to choose another CUDA version to download and install. I recommend to use 11.7, while 12.1 is too new:

• CUDA Toolkit 11.7 Downloads | NVIDIA Developer
  • https://developer.nvidia.com/cuda-11-7-0-download-archive

References:

• Install pytorch with Cuda 12.1 - PyTorch Forums

  • https://discuss.pytorch.org/t/install-pytorch-with-cuda-12-1/174294/17

• Pytorch installation with CUDA 12.1 - Reddit

  • https://www.reddit.com/r/pytorch/comments/11z9vkf/comment/jm5g09k/?utm_source=share&utm_medium=web2x&context=3

• Start Locally | PyTorch

  • https://pytorch.org/get-started/locally/

• Previous PyTorch Versions | PyTorch

  • https://pytorch.org/get-started/previous-versions/