Polynomial Regression多项式回归

一言以蔽之:xi可以是x的n次方

We can combine multiple features into one. For example, we can combine x1 and x2 into a new feature x3 by takingx1⋅x2.

We can change the behavior or curve(弧度)of our hypothesis function by making it a quadratic(平方), cubic or square root function (or any other form)

特别注意:平方、立方、开方后不要忘记对特征进行放缩

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