code: def setUp(self):
      self.x = numpy.random.uniform(size=self.in_shape).astype(
          self.dtype
      )
  
      kh, kw = _pair(self.ksize)
      sy, sx = _pair(self.stride)
      ph, pw = _pair(self.pad)
      dy, dx = _pair(self.dilate)
  
      N, C, H, W = self.in_shape
  
      o_H = get_conv_outsize(
          H, kh, sy, ph, cover_all=self.cover_all, d=dy
      )
      o_W = get_conv_outsize(
          W, kw, sx, pw, cover_all=self.cover_all, d=dx
      )
  
      self.gy = numpy.random.uniform(
          size=(N, C * kh * kw, o_H, o_W)
      ).astype(self.dtype)
      self.ggx = numpy.random.uniform(size=self.in_shape).astype(
          self.dtype
      )
  
      self.check_backward_options = {"atol": 5e-4, "rtol": 5e-3}
      if self.dtype is numpy.float16:
          self.check_backward_options.update(
              {"atol": 2e-3, "rtol": 1e-2}
          )
  
      self.check_double_backward_options = {"atol": 5e-4, "rtol": 5e-3}
      if self.dtype is numpy.float16:
          self.check_double_backward_options.update(
              {"atol": 1e-3, "rtol": 1e-2}
          )
  
imports: import unittest
  import numpy
  from six import moves
  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.utils.conv import get_conv_outsize
label_desc: Use image node_id 1 for calling the TestIm2Col obj's underlying member method code with example usage: obj.setUp() without return types