class_docstr: Unit Tests for the ImageLoader.
code: def test_resnext(self):
      self._base_test_loader("resnext")
  
file_path: ParlAI/tests/test_image_featurizers.py
imports: import os
  from PIL import Image
  import unittest
  import torch
  import zipfile
  from parlai.core.image_featurizers import ImageLoader
  from parlai.core.params import ParlaiParser
  from parlai.core.teachers import create_task_agent_from_taskname
  from parlai.utils.io import PathManager
  import parlai.utils.testing
label_desc: Use image node_id 3 for calling the TestImageLoader obj's underlying member method code with example usage: obj.test_resnext() without return types