Infinite conditional random fields for human behavior analysis

Konstantinos Bousmalis, Stefanos Zafeiriou, Louis-Philippe Morency, Maja Pantic

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    38 Citations (Scopus)

    Abstract

    Hidden conditional random fields (HCRFs) are discriminative latent variable models that have been shown to successfully learn the hidden structure of a given classification problem (provided an appropriate validation of the number of hidden states). In this brief, we present the infinite HCRF (iHCRF), which is a nonparametric model based on hierarchical Dirichlet processes and is capable of automatically learning the optimal number of hidden states for a classification task. We show how we learn the model hyperparameters with an effective Markov-chain Monte Carlo sampling technique, and we explain the process that underlines our iHCRF model with the Restaurant Franchise Rating Agencies analogy. We show that the iHCRF is able to converge to a correct number of represented hidden states, and outperforms the best finite HCRFs-chosen via cross-validation-for the difficult tasks of recognizing instances of agreement, disagreement, and pain. Moreover, the iHCRF manages to achieve this performance in significantly less total training, validation, and testing time.
    Original languageUndefined
    Pages (from-to)170-177
    Number of pages8
    JournalIEEE transactions on neural networks and learning systems
    Volume24
    Issue number1
    DOIs
    Publication statusPublished - Jan 2013

    Keywords

    • HMI-HF: Human Factors
    • hidden conditional random fields
    • EWI-24492
    • METIS-302875
    • Discriminative models
    • nonparametric Bayesian learning
    • IR-89685

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