code: def check_call(self):
      xp = self.global_context_module.xp
      x = chainer.Variable(
          _random_array(xp, (1, self.in_channels, self.H, self.W))
      )
      y = self.global_context_module(x)
  
      self.assertIsInstance(y, chainer.Variable)
      self.assertIsInstance(y.array, xp.ndarray)
      self.assertEqual(y.shape, (1, self.out_channels, self.H, self.W))
  
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 2 for calling the TestGlobalContextModule obj's underlying member method code with example usage: obj.check_call() without return types