使用Numpy打乱数组或打乱矩阵行

>>> arr = np.arange(10)
>>> np.random.shuffle(arr)
>>> arr
[9, 1, 2, 7, 5, 3, 0, 8, 4, 6]

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

        Modify a sequence in-place by shuffling its contents.
        This function only shuffles the array along the first axis of a
        multi-dimensional array. The order of sub-arrays is changed but
        their contents remains the same.
        Parameters
        ----------
        x : array_like
            The array or list to be shuffled.
        Returns
        -------
        None
        Examples
        --------
        >>> arr = np.arange(10)
        >>> np.random.shuffle(arr)
        >>> arr
        [1 7 5 2 9 4 3 6 0 8]
        Multi-dimensional arrays are only shuffled along the first axis:
        >>> arr = np.arange(9).reshape((3, 3))
        >>> np.random.shuffle(arr)
        >>> arr
        array([[3, 4, 5],
               [6, 7, 8],
               [0, 1, 2]])
"""