sorry, could you link to the project? Seems there are quite a few languages called slang.

I guess he might mean this one https://shader-slang.org/ though at first glance at least it looks more graphics than GPGPU oriented.

Edit: Hmm, this part of the same project looks general purpose-y and apparently integrates with PyTorch https://slangpy.shader-slang.org/en/latest/