Simon Keizer


2020

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The ISO Standard for Dialogue Act Annotation, Second Edition
Harry Bunt | Volha Petukhova | Emer Gilmartin | Catherine Pelachaud | Alex Fang | Simon Keizer | Laurent Prévot
Proceedings of the 12th Language Resources and Evaluation Conference

ISO standard 24617-2 for dialogue act annotation, established in 2012, has in the past few years been used both in corpus annotation and in the design of components for spoken and multimodal dialogue systems. This has brought some inaccuracies and undesirbale limitations of the standard to light, which are addressed in a proposed second edition. This second edition allows a more accurate annotation of dependence relations and rhetorical relations in dialogue. Following the ISO 24617-4 principles of semantic annotation, and borrowing ideas from EmotionML, a triple-layered plug-in mechanism is introduced which allows dialogue act descriptions to be enriched with information about their semantic content, about accompanying emotions, and other information, and allows the annotation scheme to be customised by adding application-specific dialogue act types.

2019

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User Evaluation of a Multi-dimensional Statistical Dialogue System
Simon Keizer | Ondřej Dušek | Xingkun Liu | Verena Rieser
Proceedings of the 20th Annual SIGdial Meeting on Discourse and Dialogue

We present the first complete spoken dialogue system driven by a multiimensional statistical dialogue manager. This framework has been shown to substantially reduce data needs by leveraging domain-independent dimensions, such as social obligations or feedback, which (as we show) can be transferred between domains. In this paper, we conduct a user study and show that the performance of a multi-dimensional system, which can be adapted from a source domain, is equivalent to that of a one-dimensional baseline, which can only be trained from scratch.

2018

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Downward Compatible Revision of Dialogue Annotation
Harry Bunt | Emer Gilmartin | Simon Keizer | Catherine Pelachaud | Volha Petukhova | Laurent Prévot | Mariët Theune
Proceedings 14th Joint ACL - ISO Workshop on Interoperable Semantic Annotation

2017

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Evaluating Persuasion Strategies and Deep Reinforcement Learning methods for Negotiation Dialogue agents
Simon Keizer | Markus Guhe | Heriberto Cuayáhuitl | Ioannis Efstathiou | Klaus-Peter Engelbrecht | Mihai Dobre | Alex Lascarides | Oliver Lemon
Proceedings of the 15th Conference of the European Chapter of the Association for Computational Linguistics: Volume 2, Short Papers

In this paper we present a comparative evaluation of various negotiation strategies within an online version of the game “Settlers of Catan”. The comparison is based on human subjects playing games against artificial game-playing agents (‘bots’) which implement different negotiation dialogue strategies, using a chat dialogue interface to negotiate trades. Our results suggest that a negotiation strategy that uses persuasion, as well as a strategy that is trained from data using Deep Reinforcement Learning, both lead to an improved win rate against humans, compared to previous rule-based and supervised learning baseline dialogue negotiators.

2013

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Training and evaluation of an MDP model for social multi-user human-robot interaction
Simon Keizer | Mary Ellen Foster | Oliver Lemon | Andre Gaschler | Manuel Giuliani
Proceedings of the SIGDIAL 2013 Conference

2011

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Spoken Dialog Challenge 2010: Comparison of Live and Control Test Results
Alan W Black | Susanne Burger | Alistair Conkie | Helen Hastie | Simon Keizer | Oliver Lemon | Nicolas Merigaud | Gabriel Parent | Gabriel Schubiner | Blaise Thomson | Jason D. Williams | Kai Yu | Steve Young | Maxine Eskenazi
Proceedings of the SIGDIAL 2011 Conference

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Adaptive Information Presentation for Spoken Dialogue Systems: Evaluation with real users
Verena Rieser | Simon Keizer | Oliver Lemon | Xingkun Liu
Proceedings of the 13th European Workshop on Natural Language Generation

2010

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Parameter estimation for agenda-based user simulation
Simon Keizer | Milica Gašić | Filip Jurčíček | François Mairesse | Blaise Thomson | Kai Yu | Steve Young
Proceedings of the SIGDIAL 2010 Conference

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Gaussian Processes for Fast Policy Optimisation of POMDP-based Dialogue Managers
Milica Gašić | Filip Jurčíček | Simon Keizer | Francois Mairesse | Blaise Thomson | Kai Yu | Steve Young
Proceedings of the SIGDIAL 2010 Conference

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Phrase-Based Statistical Language Generation Using Graphical Models and Active Learning
François Mairesse | Milica Gašić | Filip Jurčíček | Simon Keizer | Blaise Thomson | Kai Yu | Steve Young
Proceedings of the 48th Annual Meeting of the Association for Computational Linguistics

2009

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k-Nearest Neighbor Monte-Carlo Control Algorithm for POMDP-Based Dialogue Systems
Fabrice Lefèvre | Milica Gašić | Filip Jurčíček | Simon Keizer | François Mairesse | Blaise Thomson | Kai Yu | Steve Young
Proceedings of the SIGDIAL 2009 Conference

2008

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Training and Evaluation of the HIS POMDP Dialogue System in Noise
Milica Gašić | Simon Keizer | Francois Mairesse | Jost Schatzmann | Blaise Thomson | Kai Yu | Steve Young
Proceedings of the 9th SIGdial Workshop on Discourse and Dialogue

2007

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Proceedings of the 8th SIGdial Workshop on Discourse and Dialogue
Harry Bunt | Simon Keizer | Tim Paek
Proceedings of the 8th SIGdial Workshop on Discourse and Dialogue

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Evaluating Combinations of Dialogue Acts for Generation
Simon Keizer | Harry Bunt
Proceedings of the 8th SIGdial Workshop on Discourse and Dialogue

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An Empirically Based Computational Model of Grounding in Dialogue
Harry Bunt | Roser Morante | Simon Keizer
Proceedings of the 8th SIGdial Workshop on Discourse and Dialogue

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Dialogue Simulation and Context Dynamics for Dialogue Management
Simon Keizer | Roser Morante
Proceedings of the 16th Nordic Conference of Computational Linguistics (NODALIDA 2007)

2006

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Multidimensional Dialogue Management
Simon Keizer | Harry Bunt
Proceedings of the 7th SIGdial Workshop on Discourse and Dialogue

2002

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Dialogue Act Recognition with Bayesian Networks for Dutch Dialogues
Simon Keizer | Rieks op den Akker | Anton Nijholt
Proceedings of the Third SIGdial Workshop on Discourse and Dialogue