code: def set_epoch(self, epoch: int, batch_size: int):
      raise NotImplementedError()
  
file_path: ludwig/ludwig/data/batcher/base.py
imports: from abc import ABC, abstractmethod
  from typing import Dict
  import numpy
label_desc: Use image node_id 3 for calling the Batcher obj's underlying member method code with example usage: obj.set_epoch(epoch, batch_size) without return types