week two(2)—Learning Rate/polynomial regression /Normal Equation

 

 

一   Gradient Descent in Practice II - Learning Rate

 

 

question

 

 

二   多项式回归(polynomial regression)

 

 

 

 

 

三    正规方程 (Normal Equation)

 

 

梯度下降与多项式回归的比较

 

四  Normal Equation Noninvertibility