code: def setUp(self):
      self.depth = (
          numpy.arange(96).reshape(2, 8, 3, 2).astype(self.dtype)
      )
      self.space = numpy.array(
          [
              [
                  [
                      [0.0, 12.0, 1.0, 13.0],
                      [24.0, 36.0, 25.0, 37.0],
                      [2.0, 14.0, 3.0, 15.0],
                      [26.0, 38.0, 27.0, 39.0],
                      [4.0, 16.0, 5.0, 17.0],
                      [28.0, 40.0, 29.0, 41.0],
                  ],
                  [
                      [6.0, 18.0, 7.0, 19.0],
                      [30.0, 42.0, 31.0, 43.0],
                      [8.0, 20.0, 9.0, 21.0],
                      [32.0, 44.0, 33.0, 45.0],
                      [10.0, 22.0, 11.0, 23.0],
                      [34.0, 46.0, 35.0, 47.0],
                  ],
              ],
              [
                  [
                      [48.0, 60.0, 49.0, 61.0],
                      [72.0, 84.0, 73.0, 85.0],
                      [50.0, 62.0, 51.0, 63.0],
                      [74.0, 86.0, 75.0, 87.0],
                      [52.0, 64.0, 53.0, 65.0],
                      [76.0, 88.0, 77.0, 89.0],
                  ],
                  [
                      [54.0, 66.0, 55.0, 67.0],
                      [78.0, 90.0, 79.0, 91.0],
                      [56.0, 68.0, 57.0, 69.0],
                      [80.0, 92.0, 81.0, 93.0],
                      [58.0, 70.0, 59.0, 71.0],
                      [82.0, 94.0, 83.0, 95.0],
                  ],
              ],
          ]
      ).astype(self.dtype)
      self.x = numpy.random.randn(2, 2, 6, 4).astype(self.dtype)
      self.gy = numpy.random.randn(2, 8, 3, 2).astype(self.dtype)
      self.ggx = numpy.random.randn(2, 2, 6, 4).astype(self.dtype)
      self.r = 2
      self.check_backward_options = {}
      self.check_double_backward_options = {}
      if self.dtype == numpy.float16:
          self.check_backward_options = {"atol": 5e-4, "rtol": 5e-3}
          self.check_double_backward_options = {
              "atol": 5e-3,
              "rtol": 5e-2,
          }
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 1 for calling the TestSpace2Depth obj's underlying member method code with example usage: obj.setUp() without return types