code: def _pair(x):
      if isinstance(x, chainer.utils.collections_abc.Iterable):
          return x
      return x, x
  
imports: import numbers
  import numpy
  import six
  import chainer
  from chainer.backends import cuda
  from chainer import function
  from chainer.functions.pooling.roi_average_align_2d import _GET_BILINEAR_INTERP_KERNEL
  from chainer.functions.pooling.roi_average_align_2d import _get_bilinear_interp_params
  from chainer.functions.pooling.roi_average_align_2d import _get_bounds
  from chainer import utils
  from chainer.utils import type_check
label_desc: Use image node_id 1 for calling a global function with example usage: _pair(x) and returns: x,  x, x