code: def _add_one(x):
      return x + 1
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer.functions import relu
  from chainer import testing
  from chainermn import create_communicator
  from chainercv.links.model.mobilenet import TFConv2DBNActiv
  from chainercv.utils.testing import attr
label_desc: Use image node_id 1 for calling a global function with example usage: _add_one(x) and returns: unknown