code: def tearDown(self) -> None:
      keras.backend.clear_session()
  
file_path: calamari/calamari_ocr/test/test_train_ensemble.py
imports: import os
  import tempfile
  import unittest
  from tensorflow import keras
  from tfaip.util.tfaipargparse import post_init
  from calamari_ocr.ocr.dataset.datareader.file import FileDataParams
  from calamari_ocr.ocr.scenario import CalamariEnsembleScenario
  from calamari_ocr.scripts.train import main
  from calamari_ocr.test.calamari_test_scenario import CalamariTestEnsembleScenario
  from calamari_ocr.utils import glob_all
label_desc: Use image node_id 1 for calling the TestTrainFile obj's underlying member method code with example usage: obj.tearDown() without return types