code: def __getitem__(self, item):
      self._check_init()
      if item in self.experiment:
          return self.experiment[item]
      return self.build(item)
  
imports: import logging
  import os
  import traceback
  from abc import ABCMeta, abstractmethod
  from pathlib import Path
  from typing import Any, Callable, Dict, List, Mapping, Type, Union
  import toml
  import yaml
label_desc: Use image node_id 5 for calling the ExperimentConfig obj's underlying member method code with example usage: obj.__getitem__(item) and returns: self, self