code: def setUp(self):
      self.dataset = COCOBboxDataset(
          split=self.split,
          year=self.year,
          use_crowded=self.use_crowded,
          return_area=self.return_area,
          return_crowded=self.return_crowded,
      )
  
file_path: chainercv/tests/datasets_tests/coco_tests/test_coco_bbox_dataset.py
imports: import unittest
  import numpy
  from chainer import testing
  from chainer.testing import attr
  from chainercv.datasets import coco_bbox_label_names
  from chainercv.datasets import COCOBboxDataset
  from chainercv.utils import assert_is_bbox_dataset
label_desc: Use image node_id 1 for calling the TestCOCOBboxDataset obj's underlying member method code with example usage: obj.setUp() without return types