code: def test_invalid_reduce_option_gpu(self):
      self.check_invalid_reduce_option(cuda.cupy)
  
imports: import unittest
  import numpy
  import six
  import chainer
  from chainer import backend
  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 7 for calling the TestHingeInvalidOption obj's underlying member method code with example usage: obj.test_invalid_reduce_option_gpu() without return types