code: def test_bbox_iou_cpu(self):
      self.check(self.bbox_a, self.bbox_b, self.expected)
  
file_path: chainercv/tests/utils_tests/bbox_tests/test_bbox_iou.py
imports: from __future__ import division
  import unittest
  import numpy
  from chainer.backends import cuda
  from chainer import testing
  from chainer.testing import attr
  from chainercv.utils import bbox_iou
label_desc: Use image node_id 2 for calling the TestBboxIou obj's underlying member method code with example usage: obj.test_bbox_iou_cpu() without return types