Is it possible to build an old Torch like 2.3.0 for GeForce RTX 5070?
Blackwell support was released in CUDA 12.8 and shipped in PyTorch 2.7.0. While you could try to cherry pick all needed changes into the older PyTorch branch I would recommend updating your code instead allowing you to use any of our recent releases.
Thank you. I will look at it.