OpenCL support?

Hello Folks,

I was wondering if there were any plans to add OpenCL support to dSGP4? A quick grep through the source and documentation did no find anything relating to OpenCL. I see that PyTorch was installed when I did `pip install dsg4` and that, in turn, pulled in a bunch of NVidia libraries. Alas my laptop does not have an NVidia GPU, and while there seem to be credible reports that OpenCL may not be as fast as proprietary GPGPU interfaces, it's faster than CPU.