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    A scalable meta-classifier for combining search and classification techniques for multi-level text categorization

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    Authors
    Oakes, Michael
    Wermter, Stefan
    Tripathi, Nandita
    Issue Date
    2015-12
    
    Metadata
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    Abstract
    Nowadays, documents are increasingly associated with multi-level category hierarchies rather than a flat category scheme. As the volume and diversity of documents grow, so do the size and complexity of the corresponding category hierarchies. To be able to access such hierarchically classified documents in real-time, we need fast automatic methods to navigate these hierarchies. Today’s data domains are also very different from each other, such as medicine and politics. These distinct domains can be handled by different classifiers. A document representation system which incorporates the inherent category structure of the data should also add useful semantic content to the data vectors and thus lead to better separability of classes. In this paper, we present a scalable meta-classifier to tackle today’s problem of multi-level data classification in the presence of large datasets. To speed up the classification process, we use a search-based method to detect the level-1 category of a test document. For this purpose, we use a category–hierarchy-based vector representation. We evaluate the meta-classifier by scaling to both longer documents as well as to a larger category set and show it to be robust in both cases. We test the architecture of our meta-classifier using six different base classifiers (Random forest, C4.5, multilayer perceptron, naïve Bayes, BayesNet (BN) and PART). We observe that even though there is a very small variation in the performance of different architectures, all of them perform much better than the corresponding single baseline classifiers. We conclude that there is substantial potential in this meta-classifier architecture, rather than the classifiers themselves, which successfully improves classification performance.
    Citation
    Tripathi, N., Oakes, M.P., & Wermter, S. (2015). A Scalable Meta-Classifier Combining Search and Classification Techniques for Multi-Level Text Categorization. International Journal of Computational Intelligence and Applications, 14 (4), pp 1550020:1-1550020:16.
    Publisher
    World Scientific Publishing Company
    Journal
    International Journal on Computational Intelligence and Applications
    URI
    http://hdl.handle.net/2436/620894
    DOI
    10.1142/S1469026815500200
    Additional Links
    https://www.worldscientific.com/doi/abs/10.1142/S1469026815500200
    Type
    Journal article
    Language
    en
    ISSN
    1757-5885
    ae974a485f413a2113503eed53cd6c53
    10.1142/S1469026815500200
    Scopus Count
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    Faculty of Social Sciences

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