class_docstr: Dataset for MOTChallenge.
  
  Args:
      visibility_thr (float, optional): The minimum visibility
          for the objects during training. Default to -1.
code: def __init__(self, visibility_thr: float = -1, *args, **kwargs):
      self.visibility_thr = visibility_thr
      super().__init__(*args, **kwargs)
  
file_path: mmdetection/mmdet/datasets/mot_challenge_dataset.py
imports: import os.path
  from typing import List, Union
  from mmdet.registry import DATASETS
  from .base_video_dataset import BaseVideoDataset
label_desc: Use image node_id 1 to create a new MOTChallengeDataset object from inherited base classes: BaseVideoDataset with example: obj = MOTChallengeDataset(visibility_thr)