code: def setUp(self):
      self.img_meta = ConfigDict(dict(img_shape=(256, 256)))
      self.featmap_sizes = [(64, 64)]
      self.anchor_scale = 10
      self.anchor_strides = [1]
  
file_path: mmdetection/tests/test_models/test_task_modules/test_assigners/test_region_assigner.py
imports: from unittest import TestCase
  import torch
  from mmengine.config import ConfigDict
  from mmengine.structures import InstanceData
  from mmdet.models.task_modules.assigners import RegionAssigner
label_desc: Use image node_id 1 for calling the TestRegionAssigner obj's underlying member method code with example usage: obj.setUp() without return types