Revert DETTest.
Revert DETTest.

stereomatchingkiss/mlpack,palashahuja/mlpack,stereomatchingkiss/mlpack,palashahuja/mlpack,darcyliu/mlpack,ajjl/mlpack,ranjan1990/mlpack,ajjl/mlpack,ajjl/mlpack,stereomatchingkiss/mlpack,theranger/mlpack,darcyliu/mlpack,ranjan1990/mlpack,theranger/mlpack,theranger/mlpack,ranjan1990/mlpack,darcyliu/mlpack,palashahuja/mlpack