class_docstr: Base class for callback.
  
  :param verbose: (int)
class_docstr_tok: ["Base","class","for","callback",".",":","param","verbose",":","(","int",")"]
code: def on_training_start(
      self, locals_: Dict[str, Any], globals_: Dict[str, Any]
  ) -> None:
      # Those are reference and will be updated automatically
      self.locals = locals_
      self.globals = globals_
      self._on_training_start()
  
imports: import os
  from abc import ABC
  import warnings
  import typing
  from typing import Union, List, Dict, Any, Optional
  import gym
  import numpy
  from stable_baselines.common.vec_env import VecEnv, sync_envs_normalization, DummyVecEnv
  from stable_baselines.common.evaluation import evaluate_policy
  from stable_baselines import logger
label_desc: Use image node_id 5 for calling the BaseCallback obj's underlying member method code with example usage: obj.on_training_start(locals_, globals_) without return types