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import torch

创建一个张量并设置 requires_grad=True 用来追踪他的计算历史

x = torch.ones(2, 2, requires_grad=True)
print(x)
tensor([[1., 1.], [1., 1.]], requires_grad=True)
y = x + 2
print(y)
tensor([[3., 3.], [3., 3.]], grad_fn=<AddBackward0>)