Clarify comments and fix bug that occurs when no query set is specified.
Clarify comments and fix bug that occurs when no query set is specified.


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