code: def display():
      glClear(GL_COLOR_BUFFER_BIT)
      glDrawArrays(GL_LINE_STRIP, 0, n_vertices)
      glFlush()
  
imports: from OpenGL.GL import *
  from OpenGL.GLUT import *
  from OpenGL.raw.GL.VERSION.GL_1_5 import glBufferData
  import pyopencl
label_desc: Use image node_id 2 for calling a global function with example usage: display() without return types