Just like with the keyword-based text summarization techniques we looked at in Chapter 7, Automatic Text Summarization, topic modeling also takes into account what words are used in a text. However, the focus of topic modeling is more about themes and concepts, and not solely about summarizing text. Topic models can be used for summarization, but they can also be used for many other goals:
Topic models can assist with organization of documents, for example, to group news articles together into a cohesive section
Topic models can help us make recommendations about what to read next by finding materials that have a topic list in common
Topic models can improve search results by revealing documents that may use a mix of different keywords but are about the same idea
One critical component of the type topic modeling we will investigate in this chapter is that the analyst does not need to know what the topics or keywords are in advance. Instead, the model is created in an...
