To ensure the universality and general applicability of the curriculum, we perform an in-depth investigation on three publicly available conversation corpora, PersonaChat BIBREF12, DailyDialog BIBREF13 and OpenSubtitles BIBREF7, consisting of 140 248, 66 594 and 358 668 real-life conversation samples, respectively. 
 Question: What three publicly available coropora are used?
PersonaChat BIBREF12 DailyDialog BIBREF13 OpenSubtitles BIBREF7