code: def _pair(x):
      if hasattr(x, "__getitem__"):
          return x
      return x, x
  
imports: import unittest
  import numpy
  from six import moves
  from chainer.backends import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
  from chainer.utils.conv import get_conv_outsize
label_desc: Use image node_id 1 for calling a global function with example usage: _pair(x) and returns: x,  x, x