code: def test_col2im_2_gpu(self):
      ndim = len(self.dims)
      ksize = (2,) * ndim
      stride = (2,) * ndim
      pad = (2,) * ndim
      self.check_col2im_nd(ksize, stride, pad, gpu=True)
  
imports: import itertools
  import unittest
  import numpy
  from six import moves
  from chainer.backends import cuda
  from chainer import testing
  from chainer.testing import attr
  from chainer.utils import conv_nd
label_desc: Use image node_id 6 for calling the TestCol2ImND obj's underlying member method code with example usage: obj.test_col2im_2_gpu() without return types