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Published in:
2013 | OriginalPaper | Chapter
An N-Gram Topic Model for Time-Stamped Documents
Authors : Shoaib Jameel, Wai Lam
Published in: Advances in Information Retrieval
Publisher: Springer Berlin Heidelberg
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This paper presents a topic model that captures the temporal dynamics in the text data along with topical phrases. Previous approaches have relied upon bag-of-words assumption to model such property in a corpus. This has resulted in an inferior performance with less interpretable topics. Our topic model can not only capture changes in the way a topic structure changes over time but also maintains important contextual information in the text data. Finding topical
n
-grams, when possible based on context, instead of always presenting unigrams in topics does away with many ambiguities that individual words may carry. We derive a collapsed Gibbs sampler for posterior inference. Our experimental results show an improvement over the current state-of-the-art topics over time model.