code: def set_epoch(self, epoch):
      super().set_epoch(epoch)
      self._cur_epoch = epoch
  
imports: import logging
  import math
  from typing import List, Optional, NamedTuple
  import numpy
  import torch
  from fairseq.data import ConcatDataset, LanguagePairDataset, FileAudioDataset, data_utils
  from fairseq.data import FairseqDataset
label_desc: Use image node_id 2 for calling the MultiModalityDataset obj's underlying member method code with example usage: obj.set_epoch(epoch) without return types