Karthik Sridharan Shai Shalev-Shwartz Nathan Srebro Fast Rates for Regularized Objectives. 1545-1552 2008 NIPS http://books.nips.cc/papers/files/nips21/NIPS2008_0632.pdf conf/nips/2008 db/conf/nips/nips2008.html#SridharanSS08