code: def test_col2im_consistency(self):
      col = conv_nd.im2col_nd_cpu(
          self.x, self.ksize, self.stride, self.pad
      )
      im_cpu = conv_nd.col2im_nd_cpu(
          col, self.stride, self.pad, self.dims
      )
      im_gpu = conv_nd.col2im_nd_gpu(
          cuda.to_gpu(col), self.stride, self.pad, self.dims
      )
      testing.assert_allclose(im_cpu, im_gpu.get())
  
imports: import unittest
  import numpy
  import six.moves.cPickle
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import initializers
  from chainer.links.connection import convolution_nd
  from chainer import testing
  from chainer.testing import attr
  from chainer.utils import conv_nd
label_desc: Use image node_id 3 for calling the TestConvolutionNDIm2ColConsistency obj's underlying member method code with example usage: obj.test_col2im_consistency() without return types