code: def mulexp(xs, init=None):
      if init is not None:
          return functools.reduce("{} * {}".format, xs, init)
      else:
          return functools.reduce("{} * {}".format, xs)
  
imports: import functools
  import six
  from chainer.backends import cuda
label_desc: Use image node_id 1 for calling a global function with example usage: mulexp(xs, init) and returns: functools, functools