CUDA is proprietary to Nvidia, and it’s unlikely they would ever allow implementing it on other vendors’ hardware. DirectML mentioned here is proprietary to Mic

CUDA is proprietary to Nvidia, and it’s unlikely they would ever allow implementing it on other vendors’ hardware. DirectML mentioned here is proprietary to Microsoft but at least hardware-neutral. It is also much less popular. OpenCL is open but receives hardly any usage at all, unfortunately. (To be fair, Nvidia were at the forefront of this GPGPU thing since before there were dedicated APIs for it, so they certainly deserve some credit, but at this point they seem in desperate need for someone to finally knock them down.)