8 HALLUCINATION IN DIALOGUE GENERATION
Dialogue generation is an NLG task that automatically generates responses according to user
utterances. The generated responses are required to be fluent, coherent, and consistent with the
dialogue history. The dialogue generation task can be divided into two sub-tasks: (1) task-oriented
dialogue generation; (2) open-domain dialogue generation. A task-oriented dialogue system aims to
complete a certain task according to a user query in a specific domain, such as restaurant booking,
hotel recommendation, and calendar checking. Meanwhile, an open-domain dialogue system aims
to establish a multi-turn, long-term conversation with users while providing the users with an
engaging experience.
SurveyofHallucinationinNatural Language Generation