code: def _on_epoch_finish(self):
      raise NotImplementedError
  
imports: import os
  import pathlib
  import shutil
  from pprint import pformat
  import anyconfig
  import paddle
  import numpy
  import random
  from paddle.jit import to_static
  from paddle.static import InputSpec
  from utils import setup_logger
label_desc: Use image node_id 6 for calling the BaseTrainer obj's underlying member method code with example usage: obj._on_epoch_finish() without return types