#######################################################
# Copyright (c) 2015, ArrayFire
# All rights reserved.
#
# This file is distributed under 3-clause BSD license.
# The complete license agreement can be obtained at:
# http://arrayfire.com/licenses/BSD-3-Clause
########################################################
"""
Function to perform broadcasting operations.
"""
class _bcast(object):
_flag = False
def get(self):
return _bcast._flag
def set(self, flag):
_bcast._flag = flag
def toggle(self):
_bcast._flag ^= True
_bcast_var = _bcast()
[docs]def broadcast(func, *args):
"""
Function to perform broadcast operations.
This function can be used directly or as an annotation in the following manner.
Example
-------
Using broadcast as an annotation
>>> import arrayfire as af
>>> @af.broadcast
... def add(a, b):
... return a + b
...
>>> a = af.randu(2,3)
>>> b = af.randu(2,1) # b is a different size
>>> # Trying to add arrays of different sizes raises an exceptions
>>> c = add(a, b) # This call does not raise an exception because of the annotation
>>> af.display(a)
[2 3 1 1]
0.4107 0.9518 0.4198
0.8224 0.1794 0.0081
>>> af.display(b)
[2 1 1 1]
0.7269
0.7104
>>> af.display(c)
[2 3 1 1]
1.1377 1.6787 1.1467
1.5328 0.8898 0.7185
Using broadcast as function
>>> import arrayfire as af
>>> add = lambda a,b: a + b
>>> a = af.randu(2,3)
>>> b = af.randu(2,1) # b is a different size
>>> # Trying to add arrays of different sizes raises an exceptions
>>> c = af.broadcast(add, a, b) # This call does not raise an exception
>>> af.display(a)
[2 3 1 1]
0.4107 0.9518 0.4198
0.8224 0.1794 0.0081
>>> af.display(b)
[2 1 1 1]
0.7269
0.7104
>>> af.display(c)
[2 3 1 1]
1.1377 1.6787 1.1467
1.5328 0.8898 0.7185
"""
def wrapper(*func_args):
_bcast_var.toggle()
res = func(*func_args)
_bcast_var.toggle()
return res
if len(args) == 0:
return wrapper
else:
return wrapper(*args)
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