Stochastic Gradient Descent (SGD) for golang
- Linear
 - Logistic
 - Hinge
 
- Linear
 - [Bach and Moulines 2001] (http://hal.archives-ouvertes.fr/docs/00/60/80/41/PDF/gradsto_hal.pdf)
 - AdaGrad
 - [No More Pesky Learning Rates] (http://arxiv.org/abs/1206.1106)
 
- L1 Norm
 - L2 Norm
 - ElasticNet