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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 $s t a r t <= a x i s$ , the axis is rolled back until it lies in this position (start). If $s t a r t > a x i s$ : the axis is rolled until it lies before this position (start). If $s t a r t < 0$ , the start will be normalized as a non-negative number (more details can be seen in 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 $[- n d i m, n d i m - 1]$ or start is not in the range of $[- n d i m, n d i m]$ .

Examples

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