code: def test_call_gpu(self):
      self.global_context_module.to_gpu()
      self.check_call()
  
file_path: chainercv/tests/links_tests/model_tests/light_head_rcnn_tests/test_global_context_module.py
imports: import numpy
  import unittest
  import chainer
  from chainer.testing import attr
  from chainercv.links.model.light_head_rcnn.global_context_module import GlobalContextModule
label_desc: Use image node_id 4 for calling the TestGlobalContextModule obj's underlying member method code with example usage: obj.test_call_gpu() without return types