Interactive Teaching for Conversational AI. - Qing Ping; Feiyang Niu; Govind Thattai; Joel Chengottusseriyil; Qiaozi Gao; Aishwarya N. Reganti; Prashanth Rajagopal; Gökhan Tür; Dilek Hakkani-Tür; Prem Natarajan (CoRR, 2020)