Interpreting Document Collections Using Topic Models

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• Nikos Aletras, UCL
• Friday 13 February 2015, 12:00-13:00
• FW26, Computer Laboratory.

If you have a question about this talk, please contact Tamara Polajnar.

Topic models are a set of statistical methods for interpreting the contents of document collections. These models automatically learn sets of topics from words frequently co-occurring in documents. Topics learned often represent abstract thematic subjects, i.e Sports or Politics. Topics are also associated with relevant documents. These characteristics make topic models a useful tool for organising large digital libraries. Hence, these methods have been used to develop browsing systems allowing users to navigate through and identify relevant information in document collections by providing users with sets of topics that contain relevant documents.

The aim of this talk is to present methods for post-processing the output of topic models, making them more comprehensible and useful to humans. First, we look at the problem of identifying incoherent topics. We show that our methods work better than previously proposed approaches. Next, we propose novel methods for efficiently identifying semantically related topics which can be used for topic recommendation. Finally, we look at the problem of alternative topic representations to topic keywords. We propose approaches that provide textual or image labels which assist in topic interpretability. We also compare different topic representations within a document browsing system.

This talk is part of the NLIP Seminar Series series.

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