Update. 第一章——线性回归原理.md

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benjas 4 years ago
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- 小批量梯度下降发:![1614054402887](assets/1614054402887.png)
> 简化成代码即 θ = θ - α×(1/n) × ( (残差×数据)矩阵 )
>
> 残差=![1614131914417](assets/1614131914417.png)
(每次更新选择一小部分数据来算)

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