Before revision:  However, existing ZSID systems suffer from two limitations: 1) They are not good at modeling the relationship between seen and unseen intents , when the label names are given in the form of raw phrases or sentences . 2) They cannot effectively recognize unseen intents under the generalized intent detection (GZSID) setting.
After revision:  However, existing ZSID systems suffer from two limitations: 1) They are not good at modeling the relationship between seen and unseen intents . 2) They cannot effectively recognize unseen intents under the generalized intent detection (GZSID) setting.