code: def test_train_batch_size(self) -> None:
      self.assertEqual(4, self.training_args.train_batch_size)
  
imports: import unittest
  from towhee.trainer.training_config import TrainingConfig, get_config_help
label_desc: Use image node_id 2 for calling the TrainerArgsTest obj's underlying member method code with example usage: obj.test_train_batch_size() without return types