code: def my_app(cfg: DictConfig) -> None:
      log.info(OmegaConf.to_yaml(cfg))
  
file_path: hydra/tests/test_apps/app_with_callbacks/custom_callback/my_app.py
imports: import logging
  from typing import Any
  from omegaconf import DictConfig, OmegaConf
  import hydra
  from hydra.core.utils import JobReturn
  from hydra.experimental.callback import Callback
label_desc: Use image node_id 1 for calling a global function with example usage: my_app(cfg) without return types