To see how topic models perform on real data, we will look at two data sets containing articles originating from BBC News during the period of 2004-2005. The first data set, which we will refer to as the BBC data set, contains 2,225 articles that have been grouped into five topics. These are business, entertainment, politics, sports, and technology.
The second data set, which we will call the BBCSports data set, contains 737 articles only on sports. These are also grouped into five categories according to the type of sport being described. The five sports in question are athletics, cricket, football, rugby, and tennis. Our objective will be to see if we can build topic models for each of these two data sets that will group together articles from the same major topic.