Multi-GPU support

[catclaw]

Hi!

I hope you're doing well.
I was wondering if it's possible to include multi-gpu support in coming release? (Or if it's possible somehow with current version, that I don't know of?)
Some other video-upscaling software can utilize two or more GPUs at once for faster operation. (I.e.: Waifu2x-Extension-GUI)
Perhaps by using Pytorch Accelerate? (https://huggingface.co/docs/accelerate/en/index)

I'm C/C++ & Assembly programmer and I only know enough about Python to create basic stuff, but it's easy done in C/C++, at least.
Using 2 or more GPUs will give more performance and access to more VRAM.

Thank in you in advance.