Hierarchical Multi-Task Natural Language Understanding for Cross-domain Conversational AI: HERMIT NLU Andrea Vanzo author Emanuele Bastianelli author Oliver Lemon author 2019-09 text Proceedings of the 20th Annual SIGdial Meeting on Discourse and Dialogue Satoshi Nakamura editor Milica Gasic editor Ingrid Zukerman editor Gabriel Skantze editor Mikio Nakano editor Alexandros Papangelis editor Stefan Ultes editor Koichiro Yoshino editor Association for Computational Linguistics Stockholm, Sweden conference publication vanzo-etal-2019-hierarchical 10.18653/v1/W19-5931 https://aclanthology.org/W19-5931/ 2019-09 254 263