code: def setUp(self):
      shape = (2, 3, 9, 8)
      size = 2 * 3 * 9 * 8
      self.x = cuda.cupy.arange(size, dtype=self.dtype).reshape(shape)
      self.gy = cuda.cupy.random.uniform(-1, 1, (2, 63, 1, 1)).astype(
          self.dtype
      )
  
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
  from chainer.testing import condition
  from chainer.utils import type_check
  from chainer_tests.functions_tests.pooling_tests import pooling_nd_helper
label_desc: Use image node_id 1 for calling the TestMaxPooling2DCudnnCall obj's underlying member method code with example usage: obj.setUp() without return types