class_docstr: Open Images Challenge dataset for detection.
  
  Args:
      ann_file (str): Open Images Challenge box annotation in txt format.
code: def __init__(self, ann_file: str, **kwargs) -> None:
      if not ann_file.endswith("txt"):
          raise TypeError(
              "The annotation file of Open Images Challenge "
              "should be a txt file."
          )
  
      super().__init__(ann_file=ann_file, **kwargs)
  
imports: import csv
  import os.path
  from collections import defaultdict
  from typing import Dict, List, Optional
  import numpy
  from mmengine.fileio import get_local_path, load
  from mmengine.utils import is_abs
  from mmdet.registry import DATASETS
  from .base_det_dataset import BaseDetDataset
label_desc: Use image node_id 1 to create a new OpenImagesChallengeDataset object from inherited base classes: OpenImagesDataset with example: obj = OpenImagesChallengeDataset(ann_file)