code: def _pair(x):
      if hasattr(x, "__getitem__"):
          return x
      return x, x
  
file_path: chainer/chainer/functions/connection/deformable_convolution_2d_sampler.py
imports: import numpy
  from chainer import backend
  from chainer.functions.array import broadcast
  from chainer.functions.array import concat
  from chainer.functions.array import pad
  from chainer.functions.array import spatial_transformer_sampler
  from chainer.functions.math import matmul
label_desc: Use image node_id 3 for calling a global function with example usage: _pair(x) and returns: x,  x, x