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add third chapter
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@@ -285,9 +285,13 @@ Sum: tensor(1.)
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> 1. **Softmax 的原理**
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> Softmax 函数的公式如下:
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> $$
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> \operatorname{softmax}\left(z_{i}\right)=\frac{e^{z_{i}}}{\sum_{j} e^{z_{j}}}
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> $$
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> $`\operatorname{softmax}\left(z_{i}\right)=\frac{e^{z_{i}}}{\sum_{j} e^{z_{j}}}`$
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