code: def setUpClass(cls):
      try:
          os.mkdir("tests/saved-models")
      except FileExistsError:
          warnings.warn(
              "tests/saved-models still exists, it is possible that some test is not cleaning up properly."
          )
          pass
      model = Classifier(base_model=RoBERTa)
      model.fit(["A", "B"], ["a", "b"])
      model.save(os.path.join(cls.folder, cls.model1))
  
      model = Classifier(base_model=GPT)
      model.fit(["A", "B"], ["a", "b"])
      model.save(os.path.join(cls.folder, cls.model2))
  
file_path: finetune/tests/test_scheduler.py
imports: import os
  import unittest
  import time
  import shutil
  import warnings
  from finetune.base_models import RoBERTa, GPT
  from finetune import Classifier
  from finetune.scheduler import Scheduler
label_desc: Use image node_id 1 for calling the TestScheduler obj's underlying member method code with example usage: obj.setUpClass(cls) without return types