反向传导算法
From Ufldl
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= \frac{\partial}{\partial z^{n_l}_i}\frac{1}{2} \left\|y - h_{W,b}(x)\right\|^2 | = \frac{\partial}{\partial z^{n_l}_i}\frac{1}{2} \left\|y - h_{W,b}(x)\right\|^2 | ||
= \frac{\partial}{\partial z^{n_l}_i}\frac{1}{2} \sum_{j=1}^S_n_l(y_j-a_j^(n_l))^2 | = \frac{\partial}{\partial z^{n_l}_i}\frac{1}{2} \sum_{j=1}^S_n_l(y_j-a_j^(n_l))^2 | ||
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</math> | </math> | ||
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