code: def setUp(self):
      # Setup NumClassCheckHook
      hook = NumClassCheckHook()
      self.hook = hook
  
      # Setup runner mock
      runner = Mock()
      runner.model = Mock()
      runner.logger = Mock()
      runner.logger.warning = Mock()
      runner.train_dataloader = Mock()
      runner.val_dataloader = Mock()
      self.runner = runner
  
      # Setup dataset
      metainfo = dict(classes=None)
      self.none_classmeta_dataset = BaseDataset(
          metainfo=metainfo, lazy_init=True
      )
      metainfo = dict(classes="class_name")
      self.str_classmeta_dataset = BaseDataset(
          metainfo=metainfo, lazy_init=True
      )
      metainfo = dict(classes=("bus", "car"))
      self.normal_classmeta_dataset = BaseDataset(
          metainfo=metainfo, lazy_init=True
      )
  
      # Setup valid model
      valid_model = nn.Module()
      valid_model.add_module("backbone", VGG(depth=11))
      fused_semantic_head = FusedSemanticHead(
          num_ins=1,
          fusion_level=0,
          num_convs=1,
          in_channels=1,
          conv_out_channels=1,
      )
      valid_model.add_module("semantic_head", fused_semantic_head)
      rpn_head = nn.Module()
      rpn_head.num_classes = 1
      valid_model.add_module("rpn_head", rpn_head)
      bbox_head = nn.Module()
      bbox_head.num_classes = 2
      valid_model.add_module("bbox_head", bbox_head)
      self.valid_model = valid_model
  
      # Setup invalid model
      invalid_model = nn.Module()
      bbox_head = nn.Module()
      bbox_head.num_classes = 4
      invalid_model.add_module("bbox_head", bbox_head)
      self.invalid_model = invalid_model
  
file_path: mmdetection/tests/test_engine/test_hooks/test_num_class_check_hook.py
imports: from copy import deepcopy
  from unittest import TestCase
  from unittest.mock import Mock
  from mmcv.cnn import VGG
  from mmengine.dataset import BaseDataset
  from torch import nn
  from mmdet.engine.hooks import NumClassCheckHook
  from mmdet.models.roi_heads.mask_heads import FusedSemanticHead
label_desc: Use image node_id 1 for calling the TestNumClassCheckHook obj's underlying member method code with example usage: obj.setUp() without return types