class mindspore.ops.Unstack(axis=0)[source]

Unstacks tensor in specified axis.

Unstacks a tensor of rank R along axis dimension, output tensors will have rank (R-1).

Given a tensor of shape \((x_1, x_2, ..., x_R)\). If \(0 \le axis\), the shape of tensor in output is \((x_1, x_2, ..., x_{axis}, x_{axis+2}, ..., x_R)\).

This is the opposite of pack.


axis (int) – Dimension along which to pack. Default: 0. Negative values wrap around. The range is [-R, R).

  • input_x (Tensor) - The shape is \((x_1, x_2, ..., x_R)\). A tensor to be unstacked and the rank of the tensor must be greater than 0.


A tuple of tensors, the shape of each objects is the same.


ValueError – If axis is out of the range [-len(input_x.shape), len(input_x.shape)).

Supported Platforms:

Ascend GPU CPU


>>> unstack = ops.Unstack()
>>> input_x = Tensor(np.array([[1, 1, 1, 1], [2, 2, 2, 2]]))
>>> output = unstack(input_x)
>>> print(output)
(Tensor(shape=[4], dtype=Int64, value= [1, 1, 1, 1]), Tensor(shape=[4], dtype=Int64, value= [2, 2, 2, 2]))