text: import numpy as np
  
  from bokeh.io import curdoc
  from bokeh.layouts import row, widgetbox
  from bokeh.models import ColumnDataSource
  from bokeh.models.widgets import Slider, TextInput
  from bokeh.plotting import figure
  
  N = 200
  x = np.linspace(0, 16*np.pi, N)
  y = np.sin(x)
  source = ColumnDataSource(data=dict(x=x, y=y))
  
  
  plot = figure(plot_height=500, plot_width=500, title="Bokeh Server working with Flask",
                tools="crosshair,pan,reset,save,wheel_zoom",
                x_range=[0, 4*np.pi], y_range=[-2.5, 2.5])
  
  plot.line('x', 'y', source=source, line_width=3, line_alpha=0.6)
  
  text = TextInput(title="Change Graph Title", value='Bokeh Server working with Flask')
  offset = Slider(title="offset", value=0.0, start=-5.0, end=5.0, step=0.1)
  amplitude = Slider(title="amplitude", value=1.0, start=-5.0, end=5.0)
  phase = Slider(title="phase", value=0.0, start=0.0, end=2*np.pi)
  freq = Slider(title="frequency", value=1.0, start=0.1, end=5.1)
  
  
  # Callbacks
  def update_title(attrname, old, new):
      plot.title.text = text.value
  
  text.on_change('value', update_title)
  
  
  def update_data(attrname, old, new):
  
      a = amplitude.value
      b = offset.value
      w = phase.value
      k = freq.value
  
      # new data points
      x = np.linspace(0, 16*np.pi, N)
      y = a*np.sin(k*x + w) + b
  
      source.data = dict(x=x, y=y)
  
  for w in [offset, amplitude, phase, freq]:
      w.on_change('value', update_data)
  
  
  # Set up layouts and add to document
  inputs = widgetbox(text, offset, amplitude, phase, freq)
  
  curdoc().add_root(row(inputs, plot, width=800))
  curdoc().title = "Sliders"