[jampekka]

For gradient-optimization-of-matrices for sure. Just make sure that you don't use gradient-optimization-of-matrices just because they run well on GPUs. There may well be more efficient approaches to your problems that are infeasible for the GPUs' wide SIMD architecture you may miss if you tie yourself to GPUs.

In general it's more that some specific models are easy for GPUs. Most models probably are not.