File size: 2,323 Bytes
3662621 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 | from cupy import _core
from cupy._core import _routines_manipulation
def rollaxis(a, axis, start=0):
"""Moves the specified axis backwards to the given place.
Args:
a (cupy.ndarray): Array to move the axis.
axis (int): The axis to move.
start (int): The place to which the axis is moved.
Returns:
cupy.ndarray: A view of ``a`` that the axis is moved to ``start``.
.. seealso:: :func:`numpy.rollaxis`
"""
return _core.rollaxis(a, axis, start)
def swapaxes(a, axis1, axis2):
"""Swaps the two axes.
Args:
a (cupy.ndarray): Array to swap the axes.
axis1 (int): The first axis to swap.
axis2 (int): The second axis to swap.
Returns:
cupy.ndarray: A view of ``a`` that the two axes are swapped.
.. seealso:: :func:`numpy.swapaxes`
"""
# TODO(okuta): check type
return a.swapaxes(axis1, axis2)
def moveaxis(a, source, destination):
"""Moves axes of an array to new positions.
Other axes remain in their original order.
Args:
a (cupy.ndarray): Array whose axes should be reordered.
source (int or sequence of int):
Original positions of the axes to move. These must be unique.
destination (int or sequence of int):
Destination positions for each of the original axes. These must
also be unique.
Returns:
cupy.ndarray:
Array with moved axes. This array is a view of the input array.
.. seealso:: :func:`numpy.moveaxis`
"""
# TODO(fukatani): check type
# checking __len__ attribute is faster than cupy.isscalar or isinstance
if not (hasattr(source, '__len__') or hasattr(destination, '__len__')):
return _routines_manipulation._move_single_axis(a, source, destination)
return _core.moveaxis(a, source, destination)
def transpose(a, axes=None):
"""Permutes the dimensions of an array.
Args:
a (cupy.ndarray): Array to permute the dimensions.
axes (tuple of ints): Permutation of the dimensions. This function
reverses the shape by default.
Returns:
cupy.ndarray: A view of ``a`` that the dimensions are permuted.
.. seealso:: :func:`numpy.transpose`
"""
# TODO(okuta): check type
return a.transpose(axes)
|