Cost function

Model:

$$f_{w,b}(x^{(i)}) = wx^{(i)} + b$$

parameters :

w,b - (模型的参数)/coefficients(系数)/weights(权重)

cost function:

$$J(w,b) = \frac{1}{2m} \sum\limits_{i = 0}^{m-1} (f_{w,b}(x^{(i)}) - y^{(i)})^2$$

Objective:

$$\underset{w,b}{\text{minimize}} J(w)$$