int num_sent_in_dev_set = FileUtilityOld.numberLinesInFile(f_dev_refs[0]);
String f_dev_items = f_dev_hg_prefix +".items";
String f_dev_rules = f_dev_hg_prefix +".rules";
NbestMinRiskDAMert p_trainer= new VariationalDecoderMinRiskMert(use_shortest_ref, f_config, f_dev_items, f_dev_rules, num_sent_in_dev_set, f_dev_refs, f_nbest_prefix);
p_trainer.mainLoop();
}