code: def _vispy_timeout(self):
      self._loop.call_soon(self._vispy_timer._timeout)
  
imports: import asyncio
  from ..base import BaseApplicationBackend, BaseCanvasBackend, BaseTimerBackend
  from ...app import Timer
  from ...util import keys
  from ._offscreen_util import OffscreenContext, FrameBufferHelper
label_desc: Use image node_id 4 for calling the TimerBackend obj's underlying member method code with example usage: obj._vispy_timeout() without return types