code: def setUpClass(cls):
      cls._download_sst()
  
file_path: finetune/tests/test_masked_language_model.py
imports: import os
  import glob
  import unittest
  import warnings
  from pathlib import Path
  import pandas
  import numpy
  from finetune import MaskedLanguageModel, Classifier
  from finetune.errors import FinetuneError
  from finetune.base_models import GPT2, BERT, RoBERTa
label_desc: Use image node_id 2 for calling the TestMaskedLanguageModel obj's underlying member method code with example usage: obj.setUpClass(cls) without return types