code: def check_forward(self, x_data, use_cudnn="always"):
      x = chainer.Variable(x_data)
      with chainer.using_config("use_cudnn", use_cudnn):
          y = self.func(x)
      self.assertEqual(y.data.dtype, self.dtype)
      y_data = cuda.to_cpu(y.data)
  
      self.assertEqual(self.gy.shape, y_data.shape)
  
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 3 for calling the TestSpatialPyramidPooling2D obj's underlying member method code with example usage: obj.check_forward(x_data, use_cudnn) without return types