@article{11:105,author={Guo-Xun Yuan and Kai-Wei Chang and Cho-Jui Hsieh and Chih-Jen Lin}, Title={A Comparison of Optimization Methods and Software for Large-scale L1-regularized Linear Classification},journal={Journal of Machine Learning Research},volume={11}, url={http://www.jmlr.org/papers/volume11/yuan10c/yuan10c.pdf}}