Bug fix in dualtree_kde_cv.h
Bug fix in dualtree_kde_cv.h

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