numpy.random.permutation()

Docstring:文档字符串

permutation(x)

Randomly permute a sequence, or return a permuted range.
随机产生一个序列，或是返回一个排列范围

If x is a multi-dimensional array, it is only shuffled along its
first index.
如果x是一个多维数组，它只会按照第一个索引洗牌

Parameters

x : int or array_like
If x is an integer, randomly permute np.arange(x).
If x is an array, make a copy and shuffle the elements
randomly.

Returns

out : ndarray
Permuted sequence or array range.

Examples

np.random.permutation(10)
array([1, 7, 4, 3, 0, 9, 2, 5, 8, 6])

 np.random.permutation([1, 4, 9, 12, 15])
array([15,  1,  9,  4, 12])

 arr = np.arange(9).reshape((3, 3))
np.random.permutation(arr)
array([[6, 7, 8],
       [0, 1, 2],
       [3, 4, 5]])

Type: builtin_function_or_method