title: Displaying Bokeh Crossfilter Example
body: <p>I dowloaded the repository for Bokeh Crossfilter example from here:</p>
  
  <p><a href="https://github.com/bokeh/bokeh/tree/master/examples/app/crossfilter" rel="nofollow noreferrer">https://github.com/bokeh/bokeh/tree/master/examples/app/crossfilter</a></p>
  
  <p>It is supposed to generate the interactive plot displayed here:</p>
  
  <p><a href="https://demo.bokeh.org/crossfilter" rel="nofollow noreferrer">https://demo.bokeh.org/crossfilter</a></p>
  
  <p>I ran main.py in the repository. However, nothing appeared. Then I realized the code does not show the layout. So I added the line show(layout) in the end, which did indeed display the layout on a web browser but it would not update the plot when I select different things for x and y axes. I do realize that show(layout) code only shows whatever the layout was at the moment of running the code and it is not telling it to update. However, I couldn't figure out how to show this plot on a web browser so that it is still interactive (would update the plot when I select different axes on the browser).</p>
  
  <p>I would much appreciate any help. Thank you!</p>