TorchCompileModelAdvanced fails on Korean Windows locale due to CP949 decoding

[Seiyon]

I encountered a Failed to compile model error when using the TorchCompileModelAdvanced node from ComfyUI-KJNodes.

Environment
Windows 11 with Korean system locale
Stability Matrix
ComfyUI 0.28.0
Python 3.11.13
PyTorch 2.13.0 + CUDA 13.0
NVIDIA RTX 4090
Error

The underlying exception was:

UnicodeDecodeError: 'cp949' codec can't decode byte 0xe2

The error occurred while torch.compile was importing PyTorch Inductor and reading an internal kernel template:

torch._inductor.kernel.mm_grouped.py
torch._inductor.utils.load_template()
f.read()

This appears to happen because Python uses the Windows CP949 encoding under the Korean system locale, while the PyTorch template file is encoded in UTF-8.

Solution

In Stability Matrix, I opened:

Settings > Environment Variables > Edit

Then I added the following environment variable:

PYTHONUTF8=1

After saving the setting, I completely closed Stability Matrix, including the tray process, and restarted it.

The TorchCompileModelAdvanced node then worked correctly.

Setting PYTHONUTF8=1 in Stability Matrix is the appropriate solution when launching ComfyUI through Stability Matrix.