Bokeh-Server: Coba pakai curdoc

coba.py

import numpy as np
from numpy import pi

from bokeh.client import push_session
from bokeh.driving import cosine
from bokeh.plotting import figure, curdoc

x = np.linspace(0, 4*pi, 80)
y = np.sin(x)

p = figure()
r1 = p.line([0, 4*pi], [-1, 1], color="firebrick")
r2 = p.line(x, y, color="navy", line_width=4)

# open a session to keep our local document in sync with server
session = push_session(curdoc())

@cosine(w=0.03)
def update(step):
    r2.data_source.data["y"] = y * step
    r2.glyph.line_alpha = 1 - 0.8 * abs(step) 

curdoc().add_periodic_callback(update, 50)

session.show() # open the document in a browser

session.loop_until_closed() # run forever

Saat callback ada error

 Cannot push session document because we failed to connect to the server (to start the server, try the 'bokeh serve' command)
File "session.py", line 269, in push:
raise IOError("Cannot push session document because we failed to connect to the server (to start the server, try the 'bokeh serve' command)") Traceback (most recent call last):
  File "/root/anaconda2/lib/python2.7/site-packages/bokeh/application/handlers/code_runner.py", line 71, in run
    exec(self._code, module.__dict__)
  File "/home/onno/coba.py", line 16, in <module>
    session = push_session(curdoc())
  File "/root/anaconda2/lib/python2.7/site-packages/bokeh/client/session.py", line 63, in push_session
    session.push(document)
  File "/root/anaconda2/lib/python2.7/site-packages/bokeh/client/session.py", line 269, in push
    raise IOError("Cannot push session document because we failed to connect to the server (to start the server, try the 'bokeh serve' command)")
IOError: Cannot push session document because we failed to connect to the server (to start the server, try the 'bokeh serve' command)