code: def update():
      x, y = select_data()
      source.data = dict(x=x, y=y)
  
file_path: bokeh/examples/server/app/simple_hdf5/main.py
imports: import os
  from os.path import dirname, join
  import h5py
  from bokeh.io import curdoc
  from bokeh.layouts import row
  from bokeh.models import ColumnDataSource, Select
  from bokeh.plotting import figure
label_desc: Use image node_id 2 for calling a global function with example usage: update() without return types