NLU: natural language understanding
DST: dialog state tracker
DPL: dialog policy learning
NLG: natural language generator

Pipeline dialog system was replaced by end-to-end methods, since neural networks methods become more and more popular.

Multi-domain Dialog System

Reinforcement Learning

A Teacher-Student Framework for Maintainable Dialog Manager

knowledge infusion

Multi-domain Dialogue State Tracking as Dynamic Knowledge Graph Enhanced Question Answering