code: def setUpClass(cls):
      init_default_scope("mmdet")
      cls.num_objs = 30
  
file_path: mmdetection/tests/test_models/test_trackers/test_strong_sort_tracker.py
imports: from unittest import TestCase
  from unittest.mock import MagicMock
  import torch
  from mmengine.registry import init_default_scope
  from parameterized import parameterized
  from mmdet.registry import MODELS, TASK_UTILS
  from mmdet.testing import demo_track_inputs, get_detector_cfg, random_boxes
label_desc: Use image node_id 1 for calling the TestStrongSORTTracker obj's underlying member method code with example usage: obj.setUpClass(cls) without return types