Unsupervised Extraction and Supervised Selection of Features Based on Information Gain

  • Soo-Young Lee
  • Chandra Shahard Dhir
  • Paresh Chandra Barman
  • Sangkyun Lee
Conference paper

Abstract

For robust recognition we first extract features from sensory data without considering the class labels, and then select important features for the classification. The unsupervised feature extraction may incorporate Principle Component Analysis, Independent Component Analysis, and Non-negative Matrix factorization. For the supervised selection of features we adopt Fisher Score and Information Gain (IG). To avoid the calculation of multivariate joint probability density functions, instead of the IG, we use Mutual Information (MI) between a feature and the class variable. However, in this case the MI among selected features reduces the effectiveness of the feature selection, and the statistically-independent ICA-based features result in the best performance.

Keywords

Feature extraction feature selection Fisher score information gain mutual information independent component analysis 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • Soo-Young Lee
    • 1
  • Chandra Shahard Dhir
  • Paresh Chandra Barman
  • Sangkyun Lee
  1. 1.Brain Science Research CenterKorea Advanced Institute of Science and TechnologyDaejeon 305-701Korea

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