A proposal for classification of document data with unobserved categories considering latent topics

Yusei Yamamoto, Kenta Mikawa, Masayuki Goto

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    Abstract

    With rapid development on information society, automatic document classification by machine learning has become even more important. In document classification, it is assumed that a new input data can be classified into any of the categories observed in the training data. Therefore, if a new input data belongs to an unobserved category which does not exist in the training data, then such data cannot be classified exactly. To solve the above problem, Arakawa et al. proposed the method which models the generative probabilities of documents with a mixture of Polya distributions and estimates the optimum category within all observed and unobserved categories where it is assumed that documents in each category are generated from each single Polya distribution. However, the statistical characteristics of document categories are generally more complicated and there are various underlying latent topics in a category. Because a single Polya distribution models each category in the conventional approach, this method cannot represent the variation of word frequency depending on plural unobserved latent topics. This paper proposes a new model which assumes a mixture of Polya distributions for the generative probabilities of documents in a category to represent plural latent topics. To verify the effectiveness of the proposed method, we conduct the simulation experiments of document classification by using a set of English newspaper articles.

    Original languageEnglish
    Pages (from-to)165-174
    Number of pages10
    JournalIndustrial Engineering and Management Systems
    Volume16
    Issue number2
    DOIs
    Publication statusPublished - 2017 Jun 1

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    Keywords

    • Document classification
    • Latent topic model
    • Polya distribution
    • Unobserved category

    ASJC Scopus subject areas

    • Social Sciences(all)
    • Economics, Econometrics and Finance(all)

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