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GPU

A GPU is a processor specialized for doing many simple calculations in parallel — originally for graphics, now also for ML.

Where a CPU has a few powerful cores, a GPU (Graphics Processing Unit) has thousands of small ones, making it excellent at the massively parallel math behind rendering and neural networks. Graphics work maps naturally onto it, but so does training and inference, which is why compute backends like Metal/MPS run on it. Notably, a well-designed stack can still fall back to running on a machine with no GPU at all, just more slowly.