code: def on_initialize(self, event):
      self.context.set_state(
          clear_color="black",
          blend=True,
          blend_func=("src_alpha", "one_minus_src_alpha"),
      )
  
imports: from __future__ import division
  import numpy
  from vispy import gloo, app, scene, visuals
  from vispy.util.profiler import Profiler
label_desc: Use image node_id 2 for calling the GridCanvas obj's underlying member method code with example usage: obj.on_initialize(event) without return types