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Component-based discriminative classification for hidden Markov models

Bicego, Manuele and Pe¸kalska, Elżbieta and Tax, David M.J. and Duin, Robert P.W. (2009) Component-based discriminative classification for hidden Markov models. Pattern Recognition, Vol. 42 (11), p. 2637-2648. ISSN 0031-3203. Article.

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DOI: 10.1016/j.patcog.2009.03.023

Abstract

Hidden Markov models (HMMs) have been successfully applied to a wide range of sequence modeling problems. In the classification context, one of the simplest approaches is to train a single HMM per class. A test sequence is then assigned to the class whose HMM yields the maximum a posterior (MAP) probability. This generative scenario works well when the models are correctly estimated. However, the results can become poor when improper models are employed, due to the lack of prior knowledge, poor estimates, violated assumptions or insufficient training data. To improve the results in these cases we propose to combine the descriptive strengths of HMMs with discriminative classifiers. This is achieved by training feature-based classifiers in an HMM-induced vector space defined by specific components of individual hidden Markov models. We introduce four major ways of building such vector spaces and study which trained combiners are useful in which context. Moreover, we motivate and discuss the merit of our method in comparison to dynamic kernels, in particular, to the Fisher Kernel approach.

Item Type:Article
ID Code:2657
Status:Published
Refereed:Yes
Uncontrolled Keywords:Hidden Markov models, discriminative classification, dimensionality reduction, hybrid models, generative embeddings
Subjects:Area 09 - Ingegneria industriale e dell'informazione > ING-INF/05 Sistemi di elaborazione delle informazioni
Divisions:001 Università di Sassari > 01 Dipartimenti > Economia, impresa, regolamentazione
Publisher:Elsevier
ISSN:0031-3203
Deposited On:18 Aug 2009 10:08

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