Rewarding Chatbots for Real-World Engagement with Millions of Users. - Robert Irvine; Douglas Boubert; Vyas Raina; Adian Liusie; Ziyi Zhu; Vineet Mudupalli; Aliaksei Korshuk; Zongyi Liu; Fritz Cremer; Valentin Assassi; Christie-Carol Beauchamp; Xiaoding Lu; et al. (CoRR, 2023)