Questionnaire Chapter 04
\\[\sum_{frac{n}{2}}^{N}\\] \\(\sum_{frac{n}{2}}^{N}\\) $\sum_{frac{n}{2}}^{N}$
\\[\begin{bmatrix} w_1 \ w_2 \end{bmatrix} := \begin{bmatrix} w_1 \ w_2 \end{bmatrix} - \eta \begin{bmatrix} \frac{\partial}{\partial w_1} (w_1 + w_2 x_i - y_i)^2 \ \frac{\partial}{\partial w_2} (w_1 + w_2 x_i - y_i)^2 \end{bmatrix} = \begin{bmatrix} w_1 \ w_2 \end{bmatrix} - \eta \begin{bmatrix} 2 (w_1 + w_2 x_i - y_i) \ 2 x_i(w_1 + w_2 x_i - y_i) \end{bmatrix}\\]