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岭回归

  • 假设函数: $h_{\theta}=\theta_{0}x_{0}+\theta_{1}x_{1}+…+\theta_{n}x_{n}$
  • 损失函数: $J(\theta)=\frac{1}{2m}\sum_{i=1}^{m}(h_{\theta}(x^i)-y^i)^2+\lambda\sum_{j=1}^{n}\theta_{j}^2$
  • 目标: $\min J(\theta_{0},\theta_{1},\theta_{2}….\theta_{n})$