docstr: Activities to be performed at the end of an epoch.
code: def on_epoch_end(self):
      """Activities to be performed at the end of an epoch."""
      pass
  
imports: import abc
  import glob
  import logging
  import os
  import shelve
  import shutil
  import tempfile
  from datetime import datetime
  import numpy
  import tensorflow
  from .graph_partitioner import PARTITION_ALGO_REGISTRY, AbstractGraphPartitioner
label_desc: Use image node_id 14 for calling the PartitionDataManager obj's underlying member method code with example usage: obj.on_epoch_end() without return types