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AlphaGo as far as I know just uses standard matrix math libraries to do stuff on the GPU.

AlphaGo does not use GPUs but instead the TPUs.

"AlphaGo was powered by TPUs in the matches against Go world champion, Lee Sedol, enabling it to "think" much faster and look farther ahead between moves."

It used to use GPUs for training because I don't think the first gen TPUs could do training.

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