Expose GPU kernels for Pytorch

[loliverhennigh]

This is an interesting application of Devito. Was wondering if you know of a way to expose GPU computing in devito. I see all the examples go pytorch GPU -> numpy cpu -> Devito -> numpy cpu -> pytorch GPU.

[mloubout]

DeVito supports GPU through openacc offloading (or openmp offloading) but will need to go through numpy in-between still as there is currently no api to directly use GPU tensors