mindspore.numpy.rollaxis¶

mindspore.numpy.rollaxis(x, axis, start=0)[source]

Rolls the specified axis backwards, until it lies in the given position. The positions of the other axes do not change relative to one another.

Parameters
• x (Tensor) – A Tensor to be transposed.

• axis (int) – The axis to be rolled.

• start (int) –

Default: 0. If $$start <= axis$$, the axis is rolled back until it lies in this position (start). If $$start > axis$$: the axis is rolled until it lies before this position (start).

If $$start < 0$$, the start will be normalized as shown in the table. (Please refer to the source code.)

Returns

Transposed Tensor. Has the same data type as the original tensor x.

Supported Platforms:

Ascend GPU CPU

Raises
• TypeError – If axis or start is not integer, or x is not tensor.

• ValueError – If axis is not in the range of $$[-ndim, ndim-1]$$ or start is not in the range of $$[-ndim, ndim]$$.

Examples

>>> import mindspore.numpy as np
>>> x = np.ones((2,3,4))
>>> output = np.rollaxis(x, 0, 2)
>>> print(output.shape)
(3, 2, 4)