import numpy
生成numpy矩阵的几个相关函数：
numpy.array()
numpy.zeros()
numpy.ones()
numpy.eye()
串联生成numpy矩阵的几个相关函数：
numpy.array()
numpy.row_stack()
numpy.column_stack()
numpy.reshape()
>>> import numpy
>>> numpy.eye(3)
array([[ 1., 0., 0.],
[ 0., 1., 0.],
[ 0., 0., 1.]])
>>> numpy.zeros(3)
array([ 0
