add third chapter
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@ -286,7 +286,7 @@ Sum: tensor(1.)
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> Softmax 函数的公式如下:
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> $`\operatorname{softmax}\left(z_{i}\right)=\frac{e^{z_{i}}}{\sum_{j} e^{z_{j}}}`$
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> $\operatorname{softmax}\left(z_{i}\right)=\frac{e^{z_{i}}}{\sum_{j} e^{z_{j}}}$
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