Why? The point of research is to push the limits of what's possible, not to build something that runs on every single platform. I find it remarkable that most

Why? The point of research is to push the limits of what's possible, not to build something that runs on every single platform. I find it remarkable that most recent deep learning papers release the source code needed to reproduce their result -- and even more remarkable that many papers, like this one, can be reproduced on hardware that a hobbyist can afford. And if you'd like this to run on a CPU, you're welcome to port it. The code is open source after all.