code: def _check_call(self):
      x = self.link.xp.array(
          np.random.uniform(
              -1, 1, size=(1, 3, self.insize, self.insize)
          ),
          dtype=np.float32,
      )
  
      locs, objs, confs = self.link(x)
  
      self.assertIsInstance(locs, chainer.Variable)
      self.assertIsInstance(locs.array, self.link.xp.ndarray)
      self.assertEqual(locs.shape, (1, self.n_bbox, 4))
  
      self.assertIsInstance(objs, chainer.Variable)
      self.assertIsInstance(objs.array, self.link.xp.ndarray)
      self.assertEqual(objs.shape, (1, self.n_bbox))
  
      self.assertIsInstance(confs, chainer.Variable)
      self.assertIsInstance(confs.array, self.link.xp.ndarray)
      self.assertEqual(confs.shape, (1, self.n_bbox, self.n_fg_class))
  
file_path: chainercv/tests/experimental_tests/links_tests/model_tests/yolo_tests/test_yolo_v2_tiny.py
imports: import numpy
  import unittest
  import chainer
  from chainer import testing
  from chainer.testing import attr
  from chainercv.experimental.links import YOLOv2Tiny
label_desc: Use image node_id 2 for calling the TestYOLOv2Tiny obj's underlying member method code with example usage: obj._check_call() without return types