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fix typo #73
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docs/chapter02_prerequisite/2.3_autograd.md

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@@ -156,7 +156,7 @@ print(z)
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tensor([[2., 4.],
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[6., 8.]], grad_fn=<ViewBackward>)
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```
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现在 `y` 不是一个标量,所以在调用`backward`时需要传入一个和`y`同形的权重向量进行加权求和得到一个标量。
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现在 `z` 不是一个标量,所以在调用`backward`时需要传入一个和`z`同形的权重向量进行加权求和得到一个标量。
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``` python
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v = torch.tensor([[1.0, 0.1], [0.01, 0.001]], dtype=torch.float)
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z.backward(v)

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