<jupyter_start><jupyter_text>Autograd<jupyter_code>import torch as t
import numpy as np
from torch.autograd import Variable<jupyter_output><empty_output><jupyter_text>新建Variable<jupyter_code>x = Variable(t.ones(2, 2), requires_grad = True)
x
y = x.sum()
y
y.grad_fn
y.backward()
y = x.sum()
x.grad
y.backward()
x.grad<jupyter_output><empty_output>
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