code: def test_multiple_output_gpu(self):
      self.check_multiple_output_1arg(cuda.cupy)
      self.check_multiple_output_2args(cuda.cupy)
  
imports: import unittest
  import mock
  import numpy
  import pytest
  import chainer
  from chainer.backends import cuda
  from chainer import testing
  from chainer.testing import attr
  import chainerx
label_desc: Use image node_id 5 for calling the TestBackward obj's underlying member method code with example usage: obj.test_multiple_output_gpu() without return types