Generalization from Observed to Unobserved Features by Clustering
David Mease and Abraham Wyner

@article{9:13,author={David Mease and Abraham Wyner}, Title={Generalization from Observed to Unobserved Features by Clustering},journal={Journal of Machine Learning Research},volume={9}, url={http://www.jmlr.org/papers/volume9/buhlmann08a/buhlmann08a.pdf}}