code: def _pair(x):
      if hasattr(x, "__getitem__"):
          return x
      return x, x
  
file_path: chainer/chainer/links/connection/local_convolution_2d.py
imports: from chainer.functions.connection import local_convolution_2d
  from chainer import initializers
  from chainer import link
  from chainer import variable
label_desc: Use image node_id 1 for calling a global function with example usage: _pair(x) and returns: x,  x, x