code: def on_epoch_begin(self, epoch_number: int, logs: Dict):
      logs = logs or {}
      for callback in self.callbacks:
          callback.on_epoch_begin(epoch_number, logs)
  
imports: from typing import Dict, Sequence
label_desc: Use image node_id 5 for calling the CallbackList obj's underlying member method code with example usage: obj.on_epoch_begin(epoch_number, logs) without return types