POSTED BY
2025-11-25

Debian 12 + CUDA Version 13の環境下において、以下のようにtorchを入れようとする。

python3 -V
Python 3.11.2
python3 -m venv venv
source venv/bin/activate
(venv) pip install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cu130
...
ERROR: Cannot install torch==2.9.0+cu130 and torch==2.9.1+cu130 because these package versions have conflicting dependencies.

The conflict is caused by:
    torch 2.9.1+cu130 depends on typing-extensions>=4.10.0
    torch 2.9.0+cu130 depends on typing-extensions>=4.10.0

To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict

ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/topics/dependency-resolution/#dealing-with-dependency-conflicts
...

と、なぜかコンクリフトが発生し失敗する。エラーによればtyping-extensionsに問題があるので、先にこれを手動で入れておけば大丈夫そうだ。最初からやり直す。

(venv) deactivate
rm -Rf venv
python3 -m venv venv
source venv/bin/activate
(venv) pip install --upgrade pip
(venv) pip install "typing-extensions>=4.10.0" filelock
(venv) pip install torch torchvision torchaudio --extra-index-url https://download.pytorch.org/whl/cu130

これで完璧。コンソールでテストしてみよう。

(venv) python
Python 3.11.2 (main, Apr 28 2025, 14:11:48) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import torch
>>> print("torch:", torch.__version__)
torch: 2.9.1+cu130
>>> print("CUDA available?:", torch.cuda.is_available())
CUDA available?: True
>>> print("CUDA version reported by torch:", torch.version.cuda)
CUDA version reported by torch: 13.0

お疲れ様でした。