code: def _vispy_get_backend_name(self):
      return "osmesa"
  
imports: from __future__ import division
  from ...util.ptime import time
  from ..base import BaseApplicationBackend, BaseCanvasBackend, BaseTimerBackend
  from ...gloo import gl
  from time import sleep
label_desc: Use image node_id 3 for calling the ApplicationBackend obj's underlying member method code with example usage: obj._vispy_get_backend_name() and returns: str