code: def _identiy_grid(in_shape):
      mesh = numpy.meshgrid(
          numpy.linspace(-1.0, 1.0, num=in_shape[2]),
          numpy.linspace(-1.0, 1.0, num=in_shape[3]),
      )
      grid = numpy.concatenate([mesh[0][None], mesh[1][None]], axis=0)
      grid = numpy.repeat(grid[None], in_shape[0], axis=0).astype(
          numpy.float32
      )
      return grid
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
  from chainer.testing import condition
  from chainer import Variable
label_desc: Use image node_id 1 for calling a global function with example usage: _identiy_grid(in_shape) and returns: grid