第3章 线性模型
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3.5 $$\cfrac{\partial E{(w, b)}}{\partial w}=2\left(w \sum{i=1}^{m} x{i}^{2}-\sum{i=1}^{m}\left(y{i}-b\right) x{i}\right)$$ [推导]：已知$E{(w, b)}=\sum\limits{i=1}^{m}\left(y{i}-w x{i}-b\right)^{2}$，所以 $$\begin{aligned} \cfrac{\partial E{(w, b)}}{\partial w}&=\cfrac{\partial}{\partial w} \left[\sum{i=1}^{m}\left(y{i}-w x{i}-b\right)^{2}\right] \\ &=
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