code: def test_init(self):
      dataset = OpenImagesDataset(
          data_root="tests/data/OpenImages/",
          ann_file="annotations/oidv6-train-annotations-bbox.csv",
          data_prefix=dict(img="OpenImages/train/"),
          label_file="annotations/class-descriptions-boxable.csv",
          hierarchy_file="annotations/bbox_labels_600_hierarchy.json",
          meta_file="annotations/image-metas.pkl",
          pipeline=[],
      )
      dataset.full_init()
      self.assertEqual(len(dataset), 1)
      self.assertEqual(dataset.metainfo["classes"], ["Airplane"])
  
file_path: mmdetection/tests/test_datasets/test_openimages.py
imports: import unittest
  from mmdet.datasets import OpenImagesChallengeDataset, OpenImagesDataset
label_desc: Use image node_id 1 for calling the TestOpenImagesDataset obj's underlying member method code with example usage: obj.test_init() without return types