Topic-aware chatbot using Recurrent Neural Networks and Nonnegative Matrix Factorization. - Yuchen Guo; Nicholas Hanoian; Zhexiao Lin; Nicholas Liskij; Hanbaek Lyu; Deanna Needell; Jiahao Qu; Henry Sojico; Yuliang Wang; Zhe Xiong; Zhenhong Zou (CoRR, 2019)