Improve centering of the kernel matrix.
Improve centering of the kernel matrix.

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