Linear Regression

1. 矢量加法 比 按元素相加 要快得多

2. 噪声 + 极大似然

$$ \begin{gather} \begin{aligned} \pmb y &= \pmb{w^T x} + b + \epsilon \\ \epsilon &\sim \mathcal{N} ( 0, \sigma^2) \end{aligned} \end{gather} $$

$$ \begin{gather} \begin{aligned} P(y| \pmb{ X }) &= \end{aligned} \end{gather} $$

Gradient