your code runs fine with me there is no error. i think you are executing another file, can you look into that?
the output of your code is:
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
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tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
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tensor(3.1766e-15, grad_fn=<MseLossBackward>)
tensor(3.1766e-15, grad_fn=<MseLossBackward>)
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tensor(3.1766e-15, grad_fn=<MseLossBackward>)
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