code: def test_model_init(self):
      self.assertTrue(isinstance(self.model, nn.Module))
  
file_path: mmf/tests/modules/test_vit.py
imports: import unittest
  import torch
  from mmf.modules.vit import ViTModel
  from omegaconf import OmegaConf
  from tests.test_utils import setup_proxy, skip_if_old_transformers
  from torch import nn
label_desc: Use image node_id 3 for calling the TestViT obj's underlying member method code with example usage: obj.test_model_init() without return types