Fix collaborative filtering test (#323).
Fix collaborative filtering test (#323).


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