Refer To:https://www.cnblogs.com/llhthinker/p/5248586.html#autoid-0-1-0
1.know what is matrix and vectors
2.
NOTICE:when we use the theta1 we should we the original theta0 not the temp0.
3.when you want to change the alpha(so call ‘learning rate’),you can change it three times by three times.
4.GradientDescnet&&NormalEquation
5.let the hypothesis function be connect with the matrix to let our solution be simplier
here we always let the x0 be ‘1’.
