code: def _vispy_start(self, interval):
      self._interval = interval
      self._next_time = time() + self._interval
  
imports: from __future__ import division
  import atexit
  import ctypes
  from time import sleep
  import warnings
  import gc
  from ..base import BaseApplicationBackend, BaseCanvasBackend, BaseTimerBackend
  from ...util import keys, logger
  from ...util.ptime import time
  from ...None import config
label_desc: Use image node_id 2 for calling the TimerBackend obj's underlying member method code with example usage: obj._vispy_start(interval) without return types