code: def test_mmbt_pretrained(self):
      test_utils.setup_proxy()
      mmbt = MMBT.from_params()
      self.assertIsNotNone(mmbt)
  
imports: import gc
  import unittest
  import tests.test_utils
  import torch
  from mmf.common.sample import Sample, SampleList
  from mmf.models.mmbt import MMBT
  from mmf.modules.encoders import ImageEncoderFactory, ImageEncoderTypes, ResNet152ImageEncoder, TextEncoderFactory, TextEncoderTypes
  from mmf.modules.hf_layers import undo_replace_with_jit
  from mmf.utils.build import build_model
  from mmf.utils.configuration import Configuration
  from mmf.utils.env import setup_imports, teardown_imports
  from omegaconf import OmegaConf
label_desc: Use image node_id 3 for calling the TestMMBTConfig obj's underlying member method code with example usage: obj.test_mmbt_pretrained() without return types