Pareto Optimal Linear Classification

S.-J. Kim, A. Magnani, S. Samar, S. Boyd, and J. Lim

Proceedings of the 23rd International Conference on Machine Learning (ICML 2006), p473-480.

We consider the problem of choosing a linear classifier that minimizes misclassification probabilities in two-class classification, which is a bi-criterion problem, involving a trade-off between two objectives. We assume that the class-conditional distributions are Gaussian. This assumption makes it computationally tractable to find Pareto optimal linear classifiers whose classification capabilities are inferior to no other linear ones. The main purpose of this paper is to establish several robustness properties of those classifiers with respect to variations and uncertainties in the distributions. We also extend the results to kernel-based classification. Finally, we show how to carry out trade-off analysis empirically with a finite number of given labeled data.