Sparse representations classifier

Kernel version of the sparse representations classifier implemented with CVX

#The kernel sparse representations classifier implemented here was developed as a part of the work towards the paper

1) Gaonkar, Bilwaj, and Christos Davatzikos. "Analytic estimation of statistical significance maps for support vector machine based multi-variate image analysis and classification." NeuroImage 78 (2013): 270-283.
and is based on the paper:

2)Robust Face Recgnition via Sparse Representation John Wright, Student Member, Allen Y. Yang, Member, Arvind Ganesh, Student Member,
S. Shankar Sastry, Fellow, and Yi Ma, Senior Member.

#Please cite both papers in your work appropriately
# I have modified it sufficiently to solve things in kernel space
# as opposed to the original classifier which was in feature space