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