/
tiling.py
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/
tiling.py
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import cupy
from cupy import _core
def tile(A, reps):
"""Construct an array by repeating A the number of times given by reps.
Args:
A (cupy.ndarray): Array to transform.
reps (int or tuple): The number of repeats.
Returns:
cupy.ndarray: Transformed array with repeats.
.. seealso:: :func:`numpy.tile`
"""
try:
tup = tuple(reps)
except TypeError:
tup = (reps,)
d = len(tup)
if tup.count(1) == len(tup) and isinstance(A, cupy.ndarray):
# Fixes the problem that the function does not make a copy if A is a
# array and the repetitions are 1 in all dimensions
return cupy.array(A, copy=True, ndmin=d)
else:
# Note that no copy of zero-sized arrays is made. However since they
# have no data there is no risk of an inadvertent overwrite.
c = cupy.array(A, copy=False, ndmin=d)
if d < c.ndim:
tup = (1,) * (c.ndim - d) + tup
shape_out = tuple(s * t for s, t in zip(c.shape, tup))
if c.size == 0:
return cupy.empty(shape_out, dtype=c.dtype)
c_shape = []
ret_shape = []
for dim_in, nrep in zip(c.shape, tup):
if nrep == 1:
c_shape.append(dim_in)
ret_shape.append(dim_in)
elif dim_in == 1:
c_shape.append(dim_in)
ret_shape.append(nrep)
else:
c_shape.append(1)
c_shape.append(dim_in)
ret_shape.append(nrep)
ret_shape.append(dim_in)
ret = cupy.empty(ret_shape, dtype=c.dtype)
if ret.size:
_core.elementwise_copy(c.reshape(c_shape), ret)
return ret.reshape(shape_out)
def repeat(a, repeats, axis=None):
"""Repeat arrays along an axis.
Args:
a (cupy.ndarray): Array to transform.
repeats (int, list or tuple): The number of repeats.
axis (int): The axis to repeat.
Returns:
cupy.ndarray: Transformed array with repeats.
.. seealso:: :func:`numpy.repeat`
"""
return a.repeat(repeats, axis)