numpy.empty使用方法

https://www.runoob.com/numpy/numpy-array-creation.html

https://docs.scipy.org/doc/numpy/reference/generated/numpy.empty.html

Return a new array of given shape and type, without initializing entries.

返回一个指定形状（shape）、数据类型（dtype）且未初始化的数组。

import numpy as np
np.empty(4)

np.empty([2, 2])

# array([[1., 0.],
#        [0., 1.]])

np.empty([3, 2], dtype=int)

# array([[-618601952,        346],
#        [         0,          0],
#        [         1,          0]])

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