code: def fun(x):
      c.title = "FPS: %0.1f" % x
  
file_path: vispy/examples/demo/gloo/jfa/jfa_vispy.py
imports: import numpy
  from os import path
  import sys
  from vispy import app
  from vispy.gloo import Program, FrameBuffer, VertexBuffer, Texture2D, set_viewport
  from vispy.io import load_data_file, imread
label_desc: Use image node_id 1 for calling a global function with example usage: fun(x) without return types