print('Work 3.4 years, monthly salary = %.2f' % linear_unit.predict([3.4])) print('Work 15 years, monthly salary = %.2f' % linear_unit.predict([15])) print('Work 1.5 ...

X = data.iloc[:,0:cols-1]#X是所有行，去掉最后一列 y = data.iloc[:,cols-1:cols]#X是所有行，最后一列 #代价函数是应该是numpy矩阵，所以我们需要转换X和Y，然后才能使用它们。 我们还需要初始化theta。

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