code: def _pair(x):
      if hasattr(x, "__getitem__"):
          return x
      return x, x
  
imports: import numpy
  import chainer
  from chainer.backends import cuda
  import chainer.functions
  from chainer import links
  from chainer import testing
  from chainer.testing import parameterize
label_desc: Use image node_id 1 for calling a global function with example usage: _pair(x) and returns: x,  x, x