class_docstr: TestCallback
code: def test_print(self):
      print_callback = PrintCallBack(
          total_epoch_num=10, step_frequency=1
      )
      print_callback.on_train_batch_end(batch=(1,), logs=self.logs)
      print_callback.on_eval_batch_end(batch=(1,), logs=self.logs)
  
file_path: towhee/tests/unittests/trainer/test_callback.py
imports: import unittest
  from typing import Dict, Tuple
  from tqdm import tqdm
  from towhee.trainer.callback import TrainerControl, Callback, CallbackList, EarlyStoppingCallback, ModelCheckpointCallback, TensorBoardCallBack, PrintCallBack, ProgressBarCallBack
label_desc: Use image node_id 7 for calling the TestCallback obj's underlying member method code with example usage: obj.test_print() without return types