code: def test_call_cpu(self):
      self._check_call()
  
file_path: chainercv/tests/links_tests/model_tests/yolo_tests/test_yolo_v2.py
imports: import numpy
  import unittest
  import chainer
  from chainer import testing
  from chainer.testing import attr
  from chainercv.links import YOLOv2
label_desc: Use image node_id 3 for calling the TestYOLOv2 obj's underlying member method code with example usage: obj.test_call_cpu() without return types