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Towards More Efficient Multi-label Classification Using Dependent and Independent Dual Space Reduction

  • Eakasit Pacharawongsakda
  • Thanaruk Theeramunkong
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7302)

Abstract

While multi-label classification can be widely applied for problems where multiple classes can be assigned to an object, its effectiveness may be sacrificed due to curse of dimensionality in the feature space and sparseness of dimensionality in the label space. Moreover, it suffers with high computational cost when there exist a high number of dimensions, as well as with lower accuracy when there are a number of noisy examples. As a solution, this paper presents two alternative methods, namely Dependent Dual Space Reduction and Independent Dual Space Reduction, to reduce dimensions in the dual spaces, i.e., the feature and label spaces, using Singular Value Decomposition (SVD). The first approach constructs the covariance matrix to represent dependency between the features and labels, project both of them into a single reduced space, and then perform prediction on the reduced space. On the other hand, the second approach handles the feature space and the label space separately by constructing a covariance matrix for each space to represent feature dependency and label dependency before performing SVD on dependency profile of each space to reduce dimension and for noise elimination and then predicting using their reduced dimensions. A number of experiments evidence that prediction on the reduced spaces for both dependent and independent reduction approaches can obtain better classification performance as well as faster computation, compared to the prediction using the original spaces. The dependent approach helps saving computational time while the independent approach tends to obtain better classification performance.

Keywords

multi-label classification Singular Value Decomposition SVD dimensionality reduction Problem Transformation 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Eakasit Pacharawongsakda
    • 1
  • Thanaruk Theeramunkong
    • 1
  1. 1.School of Information, Computer, and Communication TechnologySirindhorn International Institute of Technology, Thammasat UniversityThailand

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