how to judge an expert or an anti-expert is good or not

[tqzhong]

Hello! I have read your paper and have a question about how to judge an expert or anti-expert is good or not. Your paper says that for sentiment control you trained an expert and an anti-expert based on the SST5 dataset. So what's the standard for evaluation of the fine-tuned model. Is that ppl or total likelihood loss on development set ? I would really appreciate it if you can answer my question!