Expected all tensors to be on the same device, but found at least two devices, cuda:0 and cpu!

这个错误是由于在运行过程中发现至少有两个设备，cuda:0和cpu，但是预期所有的张量都应该在同一个设备上。这个错误通常发生在使用混合设备（如GPU和CPU）进行计算时。为了解决这个问题，你需要确保所有的张量都在同一个设备上。你可以使用.to()方法将张量移动到指定的设备上，例如使用.to('cuda')将张量移动到GPU上，或使用.to('cpu')将张量移动到CPU上。这样就可以避免这个错误的发生。
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