I had to do the following to get this working:<p>- install scikit-learn (<a href="http:&#x2F;&#x2F;scikit-learn.org&#x2F;stable&#x2F;install.html" rel="nofollow">http:&#x2F;&#x2F;scikit-learn.org&#x2F;stable&#x2F;install.html</a>)<p>- install nltk (<a href="http:&#x2F;&#x2F;www.nltk.org&#x2F;install.html" rel="nofollow">http:&#x2F;&#x2F;www.nltk.org&#x2F;install.html</a>)<p>- download data set: <a href="http:&#x2F;&#x2F;www.cs.cornell.edu&#x2F;home&#x2F;llee&#x2F;data&#x2F;convote.html" rel="nofollow">http:&#x2F;&#x2F;www.cs.cornell.edu&#x2F;home&#x2F;llee&#x2F;data&#x2F;convote.html</a><p>- put data set in convote_v1.1&#x2F;<p>- fix the path in demo.py to point to the data set (you might have to change backslash to forward slash depending on your environment)