update notations
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@@ -20,7 +20,7 @@ Suppose $k=1$, $e=l(f_1(x,w_1),y)$
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Example: $e=(f_1(x,w_1)-y)^2$
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So $h_1=f_1(x,w_1)=w^T_1x$, $e=l(h_1,y)=(y-h_1)^2$
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So $h_1=f_1(x,w_1)=w^\top_1x$, $e=l(h_1,y)=(y-h_1)^2$
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$$
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\frac{\partial e}{\partial w_1}=\frac{\partial e}{\partial h_1}\frac{\partial h_1}{\partial w_1}
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