code: def setUp(self):
      self.ndim = len(self.dims)
      self.ksize = (3,) * self.ndim
      self.stride = (2,) * self.ndim
      self.pad = (1,) * self.ndim
  
      self.x_shape = (2, 4) + self.dims
  
      self.check_backward_options.update(
          {"eps": 1e-2, "atol": 1e-3, "rtol": 1e-3}
      )
      if self.dtype == numpy.float16:
          self.check_forward_options.update(
              {"atol": 5e-3, "rtol": 5e-2}
          )
          self.check_backward_options.update(
              {"eps": 2**-4, "atol": 2**-4, "rtol": 2**-4}
          )
  
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 1 for calling the TestConvolutionND obj's underlying member method code with example usage: obj.setUp() without return types