Why does Pytorch training work on CPU but not GPU?

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It's highly unlikely that Pytorch training works on CPU but not GPU. GPUs are generally used for training large and complex models in deep learning frameworks like Pytorch because of their high parallel processing capabilities that significantly speed up the training process. It's possible that the error is due to a hardware or software issue with the GPU, such as malfunctioning hardware, incorrect driver installation, or incorrect CUDA installation. It's worth checking the hardware specifications, driver versions, and versions of Pytorch and CUDA to ensure compatibility. Additionally, some models and data may not require or benefit from using a GPU, which may lead to the misconception that Pytorch training does not work on GPUs.