code: def setUp(self):
      self.N = 2
      self.in_channels = 3
      self.out_channels = 2
      self.ksize = 3
      self.stride = 2
      self.pad = 1
      if self.x_dtype == numpy.float16 or self.W_dtype == numpy.float16:
          self.check_forward_options.update(
              {"atol": 5e-3, "rtol": 5e-2}
          )
          self.check_backward_options.update(
              {"atol": 3e-2, "rtol": 5e-2}
          )
  
imports: import unittest
  import numpy
  import pytest
  import six.moves.cPickle
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import links
  from chainer import memory_layouts
  from chainer import testing
  from chainer.testing import attr
  from chainer.utils import conv
label_desc: Use image node_id 1 for calling the TestConvolution2D obj's underlying member method code with example usage: obj.setUp() without return types