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A case study on the importance of belief state representation for dialogue policy management

Kotti Margarita, Diakoloukas Vasileios, Papangelis Alexandros, Lagoudakis Michail, Stylianou, Yannis

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URIhttp://purl.tuc.gr/dl/dias/4C2EDC28-78AA-47F9-B6C9-B5A4BBA53422-
Identifierhttps://doi.org/10.21437/Interspeech.2018-1293-
Languageen-
Extent5 pagesen
TitleA case study on the importance of belief state representation for dialogue policy managementen
CreatorKotti Margaritaen
CreatorDiakoloukas Vasileiosen
CreatorΔιακολουκας Βασιλeioςel
CreatorPapangelis Alexandrosen
CreatorLagoudakis Michailen
CreatorΛαγουδακης Μιχαηλel
CreatorStylianou, Yannisen
PublisherInternational Speech Communication Associationen
Content SummaryA key component of task-oriented dialogue systems is the belief state representation, since it directly affects the policy learning efficiency. In this paper, we propose a novel, binary, compact, yet scalable belief state representation. We compare the standard verbose belief state representation (268 dimensions) with the domain-independent representation (57 dimensions) and the proposed representation (13 or 4 dimensions). To test those representations, the recently introduced Advantage Actor Critic (A2C) algorithm is exploited. The latter has not been tested before for any representation apart from the verbose one. We study the effect of the belief state representation within A2C under 0%, 15%, 30%, and 45% semantic error rate and conclude that the novel binary representation in general outperforms both the domain-independent and the verbose belief state representation. Further, the robustness of the binary representation is tested under more realistic scenarios with mismatched semantic error rates, within the A2C and DQN algorithms. The results indicate that the proposed compact, binary representation performs better or similarly to the other representations, being an efficient and promising alternative to the full belief.en
Type of ItemΠλήρης Δημοσίευση σε Συνέδριοel
Type of ItemConference Full Paperen
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2019-10-21-
Date of Publication2018-
SubjectBelief stateen
SubjectBinary belief state representationen
SubjectDialogue systemsen
SubjectDomain-independent parametrisationen
Bibliographic CitationM. Kotti, V. Diakoloukas, A. Papangelis, M.G. Lagoudakis and Y. Stylianou, "A case study on the importance of belief state representation for dialogue policy management," in 19th Annual Conference of the International Speech Communication, 2018, pp. 986-990. doi: 10.21437/Interspeech.2018-1293en

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