Search Results for author: Stefan Ultes

Found 57 papers, 7 papers with code

Similarity Scoring for Dialogue Behaviour Comparison

no code implementations SIGDIAL (ACL) 2020 Stefan Ultes, Wolfgang Maier

The differences in decision making between behavioural models of voice interfaces are hard to capture using existing measures for the absolute performance of such models.

Decision Making

Blending Task Success and User Satisfaction: Analysis of Learned Dialogue Behaviour with Multiple Rewards

no code implementations SIGDIAL (ACL) 2021 Stefan Ultes, Wolfgang Maier

Recently, principal reward components for dialogue policy reinforcement learning use task success and user satisfaction independently and neither the resulting learned behaviour has been analysed nor a suitable proper analysis method even existed.

reinforcement-learning Reinforcement Learning (RL)

From Argument Search to Argumentative Dialogue: A Topic-independent Approach to Argument Acquisition for Dialogue Systems

1 code implementation SIGDIAL (ACL) 2021 Niklas Rach, Carolin Schindler, Isabel Feustel, Johannes Daxenberger, Wolfgang Minker, Stefan Ultes

Despite the remarkable progress in the field of computational argumentation, dialogue systems concerned with argumentative tasks often rely on structured knowledge about arguments and their relations.

Relation Classification

User Interest Modelling in Argumentative Dialogue Systems

no code implementations LREC 2022 Annalena Aicher, Nadine Gerstenlauer, Wolfgang Minker, Stefan Ultes

Most systems helping to provide structured information and support opinion building, discuss with users without considering their individual interest.

A Graph-to-Text Approach to Knowledge-Grounded Response Generation in Human-Robot Interaction

no code implementations3 Nov 2023 Nicholas Thomas Walker, Stefan Ultes, Pierre Lison

After this conversion, the text representation of the dialogue state graph is included as part of the prompt of a large language model used to decode the agent response.

Knowledge Graphs Language Modelling +2

Retrieval-Augmented Neural Response Generation Using Logical Reasoning and Relevance Scoring

no code implementations20 Oct 2023 Nicholas Thomas Walker, Stefan Ultes, Pierre Lison

Constructing responses in task-oriented dialogue systems typically relies on information sources such the current dialogue state or external databases.

Logical Reasoning Response Generation +2

Fostering User Engagement in the Critical Reflection of Arguments

no code implementations17 Aug 2023 Klaus Weber, Annalena Aicher, Wolfang Minker, Stefan Ultes, Elisabeth André

To support a fair and unbiased opinion-building process, we propose a chatbot system that engages in a deliberative dialogue with a human.

Chatbot

System-Initiated Transitions from Chit-Chat to Task-Oriented Dialogues with Transition Info Extractor and Transition Sentence Generator

no code implementations6 Aug 2023 Ye Liu, Stefan Ultes, Wolfgang Minker, Wolfgang Maier

In this work, we study dialogue scenarios that start from chit-chat but eventually switch to task-related services, and investigate how a unified dialogue model, which can engage in both chit-chat and task-oriented dialogues, takes the initiative during the dialogue mode transition from chit-chat to task-oriented in a coherent and cooperative manner.

Response Generation Sentence

Unified Conversational Models with System-Initiated Transitions between Chit-Chat and Task-Oriented Dialogues

no code implementations4 Jul 2023 Ye Liu, Stefan Ultes, Wolfgang Minker, Wolfgang Maier

We contribute two efficient prompt models which can proactively generate a transition sentence to trigger system-initiated transitions in a unified dialogue model.

Sentence Spoken Dialogue Systems

GraphWOZ: Dialogue Management with Conversational Knowledge Graphs

1 code implementation23 Nov 2022 Nicholas Thomas Walker, Stefan Ultes, Pierre Lison

We present a new approach to dialogue management using conversational knowledge graphs as core representation of the dialogue state.

Dialogue Management Entity Linking +2

ConceptNet infused DialoGPT for Underlying Commonsense Understanding and Reasoning in Dialogue Response Generation

no code implementations29 Sep 2022 Ye Liu, Wolfgang Maier, Wolfgang Minker, Stefan Ultes

The pre-trained conversational models still fail to capture the implicit commonsense (CS) knowledge hidden in the dialogue interaction, even though they were pre-trained with an enormous dataset.

Response Generation Sentence

Context Matters in Semantically Controlled Language Generation for Task-oriented Dialogue Systems

no code implementations ICON 2021 Ye Liu, Wolfgang Maier, Wolfgang Minker, Stefan Ultes

We utilize the pre-trained multi-context ConveRT model for context representation in a model trained from scratch; and leverage the immediate preceding user utterance for context generation in a model adapted from the pre-trained GPT-2.

Response Generation Task-Oriented Dialogue Systems +1

Empathetic Dialogue Generation with Pre-trained RoBERTa-GPT2 and External Knowledge

no code implementations7 Sep 2021 Ye Liu, Wolfgang Maier, Wolfgang Minker, Stefan Ultes

One challenge for dialogue agents is to recognize feelings of the conversation partner and respond accordingly.

Dialogue Generation

Natural Language Understanding for Argumentative Dialogue Systems in the Opinion Building Domain

no code implementations3 Mar 2021 Waheed Ahmed Abro, Annalena Aicher, Niklas Rach, Stefan Ultes, Wolfgang Minker, Guilin Qi

Intent classifier model stacks BiLSTM with attention mechanism on top of the pre-trained BERT model and fine-tune the model for recognizing the user intent, whereas the argument similarity model employs BERT+BiLSTM for identifying system arguments the user refers to in his or her natural language utterances.

Natural Language Understanding STS

Comparative Study of Sentence Embeddings for Contextual Paraphrasing

no code implementations LREC 2020 Louisa Pragst, Wolfgang Minker, Stefan Ultes

Paraphrasing is an important aspect of natural-language generation that can produce more variety in the way specific content is presented.

Clustering Sentence +2

Evaluation of Argument Search Approaches in the Context of Argumentative Dialogue Systems

no code implementations LREC 2020 Niklas Rach, Yuki Matsuda, Johannes Daxenberger, Stefan Ultes, Keiichi Yasumoto, Wolfgang Minker

We present an approach to evaluate argument search techniques in view of their use in argumentative dialogue systems by assessing quality aspects of the retrieved arguments.

Improving Interaction Quality Estimation with BiLSTMs and the Impact on Dialogue Policy Learning

no code implementations WS 2019 Stefan Ultes

Learning suitable and well-performing dialogue behaviour in statistical spoken dialogue systems has been in the focus of research for many years.

Reinforcement Learning (RL) Spoken Dialogue Systems

Addressing Objects and Their Relations: The Conversational Entity Dialogue Model

no code implementations WS 2018 Stefan Ultes, Paweł\ Budzianowski, Iñigo Casanueva, Lina Rojas-Barahona, Bo-Hsiang Tseng, Yen-chen Wu, Steve Young, Milica Gašić

Statistical spoken dialogue systems usually rely on a single- or multi-domain dialogue model that is restricted in its capabilities of modelling complex dialogue structures, e. g., relations.

Spoken Dialogue Systems

MultiWOZ - A Large-Scale Multi-Domain Wizard-of-Oz Dataset for Task-Oriented Dialogue Modelling

1 code implementation EMNLP 2018 Pawe{\l} Budzianowski, Tsung-Hsien Wen, Bo-Hsiang Tseng, I{\~n}igo Casanueva, Stefan Ultes, Osman Ramadan, Milica Ga{\v{s}}i{\'c}

Even though machine learning has become the major scene in dialogue research community, the real breakthrough has been blocked by the scale of data available. To address this fundamental obstacle, we introduce the Multi-Domain Wizard-of-Oz dataset (MultiWOZ), a fully-labeled collection of human-human written conversations spanning over multiple domains and topics. At a size of 10k dialogues, it is at least one order of magnitude larger than all previous annotated task-oriented corpora. The contribution of this work apart from the open-sourced dataset is two-fold:firstly, a detailed description of the data collection procedure along with a summary of data structure and analysis is provided.

Decision Making Dialogue Management +4

MultiWOZ -- A Large-Scale Multi-Domain Wizard-of-Oz Dataset for Task-Oriented Dialogue Modelling

5 code implementations EMNLP 2018 Paweł Budzianowski, Tsung-Hsien Wen, Bo-Hsiang Tseng, Iñigo Casanueva, Stefan Ultes, Osman Ramadan, Milica Gašić

Even though machine learning has become the major scene in dialogue research community, the real breakthrough has been blocked by the scale of data available.

Response Generation

Deep learning for language understanding of mental health concepts derived from Cognitive Behavioural Therapy

1 code implementation WS 2018 Lina Rojas-Barahona, Bo-Hsiang Tseng, Yinpei Dai, Clare Mansfield, Osman Ramadan, Stefan Ultes, Michael Crawford, Milica Gasic

In recent years, we have seen deep learning and distributed representations of words and sentences make impact on a number of natural language processing tasks, such as similarity, entailment and sentiment analysis.

Sentence Sentence Embeddings +2

Changing the Level of Directness in Dialogue using Dialogue Vector Models and Recurrent Neural Networks

no code implementations WS 2018 Louisa Pragst, Stefan Ultes

In cooperative dialogues, identifying the intent of ones conversation partner and acting accordingly is of great importance.

Interaction Quality Estimation Using Long Short-Term Memories

no code implementations WS 2017 Niklas Rach, Wolfgang Minker, Stefan Ultes

For estimating the Interaction Quality (IQ) in Spoken Dialogue Systems (SDS), the dialogue history is of significant importance.

General Classification Spoken Dialogue Systems

Sample-efficient Actor-Critic Reinforcement Learning with Supervised Data for Dialogue Management

no code implementations WS 2017 Pei-Hao Su, Pawel Budzianowski, Stefan Ultes, Milica Gasic, Steve Young

Firstly, to speed up the learning process, two sample-efficient neural networks algorithms: trust region actor-critic with experience replay (TRACER) and episodic natural actor-critic with experience replay (eNACER) are presented.

Dialogue Management Management +2

First Insight into Quality-Adaptive Dialogue

no code implementations LREC 2014 Stefan Ultes, H{\"u}seyin Dikme, Wolfgang Minker

While Spoken Dialogue Systems have gained in importance in recent years, most systems applied in the real world are still static and error-prone.

Dialogue Management Management +1

Comparison of Gender- and Speaker-adaptive Emotion Recognition

no code implementations LREC 2014 Maxim Sidorov, Stefan Ultes, Alex Schmitt, er

In this contribution, we argue that adding information unique for each speaker, i. e., by using speaker identification techniques, improves emotion recognition simply by adding this additional information to the feature vector of the statistical classification algorithm.

Attribute Emotion Classification +3

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