In this paper, we study the problem of using contextual da- ta points of a data point for its classification problem. We propose to represent a data point as the sparse linear reconstruction of its context, and learn the sparse context to gather with a linear classifier in a su- pervised way to increase its discriminative ability. We proposed a novel formulation for context learning, by modeling the learning of context reconstruction coefficients and classifier in a unified objective. In this objective, the reconstruction error is minimized and the coefficient spar- sity is encouraged. Moreover, the hinge loss of the classifier is minimized and the complexity of the classifier is reduced. This objective is opti- mized by an alternative strategy in an iterative algorithm. Experiments on three benchmark data set show its advantage over state-of-the-art context-based data representation and classification methods.
@article{arxiv.1507.00019,
title = {Representing data by sparse combination of contextual data points for classification},
author = {Jingyan Wang and Yihua Zhou and Ming Yin and Shaochang Chen and Benjamin Edwards},
journal= {arXiv preprint arXiv:1507.00019},
year = {2015}
}