fixed commutative -> reflexive for distance metric def
fixed commutative -> reflexive for distance metric def

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