Add test for regularization in Gradient().
Add test for regularization in Gradient().


palashahuja/mlpack,darcyliu/mlpack,ranjan1990/mlpack,ersanliqiao/mlpack,datachand/mlpack,Azizou/mlpack,ajjl/mlpack,lezorich/mlpack,theranger/mlpack,ersanliqiao/mlpack,ajjl/mlpack,theranger/mlpack,BookChan/mlpack,thirdwing/mlpack,bmswgnp/mlpack,erubboli/mlpack,palashahuja/mlpack,Azizou/mlpack,lezorich/mlpack,trungda/mlpack,stereomatchingkiss/mlpack,minhpqn/mlpack,chenmoshushi/mlpack,datachand/mlpack,BookChan/mlpack,ersanliqiao/mlpack,theranger/mlpack,BookChan/mlpack,ranjan1990/mlpack,stereomatchingkiss/mlpack,trungda/mlpack,minhpqn/mlpack,ranjan1990/mlpack,trungda/mlpack,bmswgnp/mlpack,thirdwing/mlpack,darcyliu/mlpack,datachand/mlpack,minhpqn/mlpack,chenmoshushi/mlpack,Azizou/mlpack,thirdwing/mlpack,ajjl/mlpack,palashahuja/mlpack,darcyliu/mlpack,chenmoshushi/mlpack,erubboli/mlpack,erubboli/mlpack,bmswgnp/mlpack,lezorich/mlpack,stereomatchingkiss/mlpack