Adaptive metric learning vector quantization for ordinal classification

Shereen Fouad*, Peter Tino

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review


    Many pattern analysis problems require classification of examples into naturally ordered classes. In such cases, nominal classification schemes will ignore the class order relationships, which can have a detrimental effect on classification accuracy. This article introduces two novel ordinal learning vector quantization (LVQ) schemes, with metric learning, specifically designed for classifying data items into ordered classes. In ordinal LVQ, unlike in nominal LVQ, the class order information is used during training in selecting the class prototypes to be adapted, as well as in determining the exact manner in which the prototypes get updated. Prototype-based models in general are more amenable to interpretations and can often be constructed at a smaller computational cost than alternative nonlinear classification models. Experiments demonstrate that the proposed ordinal LVQ formulations compare favorably with their nominal counterparts. Moreover, our methods achieve competitive performance against existing benchmark ordinal regression models.

    Original languageEnglish
    Pages (from-to)2825-2851
    Number of pages27
    JournalNeural Computation
    Issue number11
    Publication statusPublished - 1 Nov 2012


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