Add test case for the convolution batch mode.
Add test case for the convolution batch mode.

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