code: def tearDown(self):
      registry.register("config", self.original_config)
  
file_path: mmf/tests/datasets/test_multi_dataset_loader.py
imports: import unittest
  from collections import Counter
  import numpy
  import torch
  from mmf.common.registry import registry
  from mmf.datasets.multi_dataset_loader import MultiDatasetLoader
  from omegaconf import OmegaConf
  from torch.utils.data import DataLoader
  from ..test_utils import NumbersDataset
label_desc: Use image node_id 2 for calling the TestMultiDatasetLoader obj's underlying member method code with example usage: obj.tearDown() without return types