Hello Hamish,

Take a look on LightOn's OPU. It is a relatively simple photonic processor that can do random projection lightning fast. They have a sample where they are using it for reinforcement learning and it's working surprisingly well. I've also written a short article about them. You can find it here: https://hackernoon.com/how-photonic-processors-will-save-machine-learning-9h8935h0