code: def test_forward_gpu(self):
      self.check_forward(cuda.to_gpu(self.h), cuda.to_gpu(self.x))
  
imports: import unittest
  import mock
  import numpy
  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 6 for calling the TestZoneout obj's underlying member method code with example usage: obj.test_forward_gpu() without return types