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3.3 节最后的损失函数需要sum后才可以调用backward函数 #83

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3.3 节最后的损失函数需要sum后才可以调用backward函数 #83

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kevindragon
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3.3.7 训练模型：损失函数需要sum

@ShusenTang
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MSELoss默认会求平均，所以得到的loss已经是个标量。

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@kevindragon @ShusenTang