fix bug--forgot to initialize parameter scale
fix bug--forgot to initialize parameter scale

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