arr = np.array([[1,2],
[2,3],
[5,6]])
是否有任何 numpy 函数可以将上述 2d 数组克隆为 3d 数组,如下所示?如果没有,如何分多个步骤完成?
bb = np.?????(arr, 3)
>> print(bb)
[[[1,2],
[2,3],
[5,6]],
[[1,2],
[2,3],
[5,6]],
[[1,2],
[2,3],
[5,6]]]
broadcast_to
和列表重复:
out = np.broadcast_to(arr, (3,)+arr.shape)
out = np.array([arr]*3)
这两种情况的输出都是
array([[[1, 2],
[2, 3],
[5, 6]],
[[1, 2],
[2, 3],
[5, 6]],
[[1, 2],
[2, 3],
[5, 6]]])