class_docstr: BaseTimerBackend(vispy_timer)
  
  Abstract class that provides an interface between backends and Timer.
  Each backend must implement a subclass of TimerBackend, and
  implement all its _vispy_xxx methods.
class_docstr_tok: ["BaseTimerBackend","(","vispy_timer",")","Abstract","class","that","provides","an","interface","between","backends","and","Timer",".","Each","backend","must","implement","a","subclass","of","TimerBackend",",","and","implement","all","its","_vispy_xxx","methods","."]
code: def _vispy_start(self, interval):
      raise NotImplementedError
  
imports: from ..util import SimpleBunch
  import time
  from timeit import default_timer
label_desc: Use image node_id 2 for calling the BaseTimerBackend obj's underlying member method code with example usage: obj._vispy_start(interval) without return types