code: def fuse(*args, **kwargs):
      """Function fusing decorator.
  
      It calls :func:`cupy.fuse` when CuPy is available to make fused function
      and does nothing otherwise.
  
      .. seealso::
         :func:`cupy.fuse`
  
      """
      if available:
          return cupy.fuse(*args, **kwargs)
      elif len(args) == 1 and len(kwargs) == 0 and callable(args[0]):
          return args[0]
      else:
          return lambda f: f
  
imports: import binascii
  import functools
  import itertools
  import os
  import threading
  import time
  import typing
  import warnings
  import numpy
  import six
  import chainer
  from chainer import _backend
  from chainer.backends import _cpu
  from chainer.backends import intel64
  from chainer.configuration import config
  from chainer import types
  import chainerx
label_desc: Use image node_id 20 for calling a global function with example usage: fuse() and returns: cupy, args, function