code: def test_train_with_val(self):
      trainer_params = default_trainer_params(with_validation=True)
      with tempfile.TemporaryDirectory() as d:
          trainer_params.output_dir = d
          main(trainer_params)
  
imports: import os
  import tempfile
  import unittest
  from tensorflow import keras
  from tfaip.data.pipeline.processor.params import SequentialProcessorPipelineParams
  from calamari_ocr.ocr.dataset.datareader.hdf5.reader import Hdf5
  from calamari_ocr.ocr.dataset.imageprocessors import PrepareSampleProcessorParams
  from calamari_ocr.ocr.training.pipeline_params import CalamariTrainOnlyPipelineParams
  from calamari_ocr.scripts.train import main
  from calamari_ocr.test.calamari_test_scenario import CalamariTestScenario
label_desc: Use image node_id 3 for calling the TestHDF5Train obj's underlying member method code with example usage: obj.test_train_with_val() without return types