code: def data_flat(c=1.0):
      N = 500
      x = np.random.random(size=N)
      y = np.random.random(size=N)
      r = c * np.linspace(0, 1, N)
      return x * 100, y * 100, r
  
imports: import numpy
  from bokeh.layouts import gridplot
  from bokeh.models import LinearColorMapper
  from bokeh.plotting import figure, show
  from bokeh.transform import transform
label_desc: Use image node_id 1 for calling a global function with example usage: data_flat(c) and returns: unknown,  unknown,  r