code: def test_scheduler(self):
      m1 = os.path.join(self.folder, self.model1)
      m2 = os.path.join(self.folder, self.model2)
      shed = Scheduler()
  
      # Checks model caching
      time_pre = time.time()
      pred1a = shed.predict(m1, ["A"])
      time_mid = time.time()
      pred1b = shed.predict(m1, ["A"])
      time_end = time.time()
      self.assertLess(
          time_end - time_mid, time_mid - time_pre - 1
      )  # Assert that it is at least 1 second quicker
      self.assertEqual(pred1a, pred1b)
      pred2a = shed.predict(m2, ["A"])  # Load another model.
      self.assertEqual(len(shed.loaded_models), 2)
      time2_start = time.time()
      pred1b = shed.predict(m1, ["A"])
      time2_end = time.time()
      pred2b = shed.predict(m2, ["A"])
      self.assertEqual(pred2a, pred2b)
      self.assertLess(
          time2_end - time2_start, time_mid - time_pre - 1
      )  # Assert that it is still quicker.
      shed.predict_proba(m1, ["A"])
      shed.featurize(m1, ["A"])
      shed.featurize(m1, ["A"])
      shed.featurize_sequence(m1, ["A"])
  
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 3 for calling the TestScheduler obj's underlying member method code with example usage: obj.test_scheduler() without return types