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As Choong mentioned, OpenCL and Metal are both available. There is some evidence that OpenCL actually performs better on some GPUs: https://www.andrey-melentyev.com/plaidml-on-apple-metal.html
I would try each one and use the one that works best for you. You can select a backend at anytime by running
Closing this for now, please let us know if you have any other questions or need help getting started.