Add implementation of the iRPROP- method to update the weights.
Add implementation of the iRPROP- method to update the weights.

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