線性迴歸的梯度下降法

一元線性迴歸   一元線性迴歸的損失函數是 L ( a , b ) = ∑ i = 1 n ( a x i + b − y i ) 2 L(a, b)=\sum_{i=1}^{n}(ax_{i}+b-y_{i})^2 L(a,b)=i=1∑n​(axi​+b−yi​)2   偏導數分別爲 ∂ L ∂ a = ∑ i = 1 n 2 x i ( a x i + b − y i ) \frac{\pa

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