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SkewnessIt is the degree of distortion from the symmetrical bell curve or the normal distribution. It measures the lack of symmetry in data distribution.It differentiates extreme values in one versu...

梯度下降和Normal Equation的比较Normal Equation是一种基础的最小二乘方法推导：https://zhuanlan.zhihu.com/p/22757336梯度下降Normal Equation需要选择学习率不需要选择学习率需要很多次迭代不需要很多次迭代复杂度低 O(kn2)O(kn^2)O(kn2)复杂度高 O(n3)O(n...