code: def _pair(x):
      if hasattr(x, "__getitem__"):
          return x
      return x, x
  
file_path: chainercv/chainercv/links/model/mobilenet/tf_convolution_2d.py
imports: import numpy
  import chainer
  from chainer.functions import pad
  from chainer.links import Convolution2D
  from chainer.utils import conv
label_desc: Use image node_id 1 for calling a global function with example usage: _pair(x) and returns: x,  x, x