The code contains a very very simple implementation of non-parametric one-class classification with Gaussian processes.
Detailed description of the algorithm with experiments:
(1) Michael Kemmler and Erik Rodner and Joachim Denzler: "One-Class Classification with Gaussian Processes" (Proceedings of the 10th Asian Conference on Computer Vision 2010).
(2) Michael Kemmler and Erik Rodner and Esther-Sabrina Wacker and Joachim Denzler: "Nonparametric One-class Classification with Gaussian Processes" (Pattern Recognition 2013)
Please cite one of the above mentioned papers in case you use the source code.