The Research On Task-oriented Dialogue System

With the improvement of people's living standards,people's requirements for the intelligence of device interaction are getting higher and higher.It is hoped that future devices can communicate with human beings naturally and can accomplish the tasks required by human beings in the process of dialogue.This puts high demands on the accuracy and intelligence of the dialogue system.The existing dialogue systems are mainly divided into two categories:open-domain dialogue systems and task-oriented dialogue systems.The open-domain dialogue systems are not specific to specific tasks and can be used to talk to users for any purpose.The task-oriented dialogue systems interact with users for the purpose of completing the tasks of the specific domain proposed by users,and completing users'requirements in the interaction process.The research object of this thesis is the task-oriented dialogue system.The contributions are as follows:(1)For the demands that the task-oriented dialogue system needs to understand dialogue semantic and process the external database properly,we design a task-oriented dialogue system model.The dialogue system model designed can utilize the dialogue sentence encoder to extract the dialog context information,utilize the dialogue state tracker to extract the dialogue state information,and utilize the database vector encoder to extract the external database information.With the help of attention mechanism,the decoder of the model comprehensively utilizes the obtained dialogue context vector,dialogue state information vector,and external database entities'vectors to understand dialogue semantic,process the external database,and generate system reply that meets the users'requirements.(2)Using the data provided by Stanford University,we accomplish the task-oriented dialogue system model designed in the thesis.Comparing with the existing dialogue system models,we obtain the effect of the task-oriented dialogue system model designed.By removing each module of the model designed,we test the impact of each module of the task-oriented dialogue system model designed in the thesis.We also test model hyper-parameters changes' impact to the effect of the model at the same time.