code: def _initialize_backend(self, backend, **kwargs):
      if backend == InputControllers.CLIENT:
          from serpent.input_controllers.client_input_controller import (
              ClientInputController,
          )
  
          return ClientInputController(game=self.game, **kwargs)
      elif backend == InputControllers.PYAUTOGUI:
          from serpent.input_controllers.pyautogui_input_controller import (
              PyAutoGUIInputController,
          )
  
          return PyAutoGUIInputController(game=self.game, **kwargs)
      elif backend == InputControllers.NATIVE_WIN32:
          from serpent.input_controllers.native_win32_input_controller import (
              NativeWin32InputController,
          )
  
          return NativeWin32InputController(game=self.game, **kwargs)
      else:
          raise InputControllerError(
              "The specified backend is invalid!"
          )
  
imports: import enum
  from sneakysnek.keyboard_keys import KeyboardKey
  from sneakysnek.keyboard_event import KeyboardEvent
  from sneakysnek.mouse_buttons import MouseButton
  from sneakysnek.mouse_event import MouseEvent
label_desc: Use image node_id 22 for calling the InputController obj's underlying member method code with example usage: obj._initialize_backend(backend) and returns: ClientInputController, PyAutoGUIInputController, NativeWin32InputController