code: def implementations(
      self,
  ) -> Mapping[Callable[..., Any], List[Type[Any]]]:
      implementations: Dict[Callable[..., Any], List[Type[Any]]] = {}
      for args, impl in self.obj.funcs.items():
          implementations.setdefault(impl, []).append(args)
      return implementations
  
imports: import inspect
  from dataclasses import dataclass
  from pathlib import Path
  from types import ModuleType
  from typing import Any, Callable, Deque, Dict, List, Mapping, Set, TextIO, Tuple, Type, Union
  from gpflow.utilities import Dispatcher
label_desc: Use image node_id 1 for calling the DocumentableDispatcher obj's underlying member method code with example usage: obj.implementations() and returns: implementations