code: def restore_gh_from_backup(_gh_backup: Any) -> Any:
      if _gh_backup is None:
          del Singleton._instances[GlobalHydra]
      else:
          Singleton._instances[GlobalHydra] = _gh_backup
  
imports: import copy
  import os
  from textwrap import dedent
  from typing import Any, Optional
  from hydra import version
  from hydra._internal.deprecation_warning import deprecation_warning
  from hydra._internal.hydra import Hydra
  from hydra._internal.utils import create_config_search_path, detect_calling_file_or_module_from_stack_frame, detect_task_name
  from hydra.core.global_hydra import GlobalHydra
  from hydra.core.singleton import Singleton
  from hydra.errors import HydraException
label_desc: Use image node_id 2 for calling a global function with example usage: restore_gh_from_backup(_gh_backup) without return types