Topic model

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This is a technical method discussed in Social Media Analysis 10-802 in Spring 2010.

Topic models are probabilistic, generative models that use Hierarchical Bayesian Analysis of a document collection (data) to uncover the underlying semantic structure. Different types of topic models have been proposed to capture different notions of the underlying semantic structure, including :

  • A document may have words from multiple topics (LDA)
  • Links between documents imply homophily in topic-space (link-LDA, Relational topic model)
  • Utilizing known labels on documents while learning parameters (supervised-LDA)
  • Authors write similar documents (Author-Topic model)
  • Authors write similar documents, conditioned on who the recipient is. (Author-Recipient-Topic model)

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