This document summarizes Katrien Verbert's talk on mixed-initiative recommender systems at the 12th RecSysNL meetup. It discusses how recommender systems can increase user trust and acceptance by explaining recommendations and enabling user interaction with the recommendation process. Examples of Verbert's research include systems like TasteWeights and IntersectionExplorer that provide transparency, user control, and support for exploration in recommender interfaces. Verbert's work also examines how personal characteristics affect user experience with different types and levels of recommender system controllability.
Two Brains are Better than One: User Control in Adaptive Information AccessPeter Brusilovsky
In recent years, the use of Artificial Intelligence (AI) technologies expanded to many areas where they directly affect the lives of many people. AI-based approaches advise human decision-makers who should be released on bail, whether it is a good time to discharge a patient from a hospital and whether a specific student is at risk to fail a course. Such an extensive use in AI in decision making came with a range of protentional problems that have been extensively studied over the last few years. Recognition of these problems motivated a rapid rise of research on “human-centered AI”, which attempted to address and minimize the negative effects of using AI technologies. Among the ideas of human-centered AI is user control - engaging users in affecting AI decision making to prevent possible errors and biases. In my talk, I will focus on the application of user control in one popular area of AI application, adaptive information access. Adaptive information access systems such as personalized search and recommender systems attempt to model their users to help them in finding the most relevant information. Yet, user modeling and personalization mechanisms might not always work as expected resulting in errors, biases, and suboptimal behavior. Combining the decision power or AI with the ability of the user to guide and control it brings together the strong sides of artificial and human intelligence and could lead to better results. In my talk, I review several projects focused on user control in adaptive information access systems and discuss the benefits and challenges of this approach.
Delineating Cancer Genomics through Data VisualizationRupam Das
In spite in advances in technologies for working with data, people spend undue amount of time in understanding the data and manipulating it into holistic visualization. Data visualization software for complex dataset such as in cancer genomics (which we have taken as case study) are not able to provide effective visualization for the users. Identification and characterization of cancer detection are important areas of research that are based on the integrated analysis of multiple heterogeneous genomics datasets. In this report, we review the key issues and challenges associated with cancer genomics through exploration of data visualization techniques, interactions and methods, which will in-turn advance the state of the art.
Two Brains are Better than One: User Control in Adaptive Information AccessPeter Brusilovsky
In recent years, the use of Artificial Intelligence (AI) technologies expanded to many areas where they directly affect the lives of many people. AI-based approaches advise human decision-makers who should be released on bail, whether it is a good time to discharge a patient from a hospital and whether a specific student is at risk to fail a course. Such an extensive use in AI in decision making came with a range of protentional problems that have been extensively studied over the last few years. Recognition of these problems motivated a rapid rise of research on “human-centered AI”, which attempted to address and minimize the negative effects of using AI technologies. Among the ideas of human-centered AI is user control - engaging users in affecting AI decision making to prevent possible errors and biases. In my talk, I will focus on the application of user control in one popular area of AI application, adaptive information access. Adaptive information access systems such as personalized search and recommender systems attempt to model their users to help them in finding the most relevant information. Yet, user modeling and personalization mechanisms might not always work as expected resulting in errors, biases, and suboptimal behavior. Combining the decision power or AI with the ability of the user to guide and control it brings together the strong sides of artificial and human intelligence and could lead to better results. In my talk, I review several projects focused on user control in adaptive information access systems and discuss the benefits and challenges of this approach.
Delineating Cancer Genomics through Data VisualizationRupam Das
In spite in advances in technologies for working with data, people spend undue amount of time in understanding the data and manipulating it into holistic visualization. Data visualization software for complex dataset such as in cancer genomics (which we have taken as case study) are not able to provide effective visualization for the users. Identification and characterization of cancer detection are important areas of research that are based on the integrated analysis of multiple heterogeneous genomics datasets. In this report, we review the key issues and challenges associated with cancer genomics through exploration of data visualization techniques, interactions and methods, which will in-turn advance the state of the art.
User Control in AIED (Artificial Intelligence in Education)Peter Brusilovsky
Slides of my intro to "Meet the Expert" session at AIED 2021. This is a subset of slides of a longer presentation on user control in AI extended with many specific examples from AIED area.
Scalable Exploration of Relevance Prospects to Support Decision MakingKatrien Verbert
Presented at IntRS 2016 - Interfaces and Human Decision Making for Recommender Systems, workshop at RecSys 2016
Citation: Verbert, K., Seipp, K., He, C., Parra, D., Wongchokprasitti, C., & Brusilovsky, P. (2016). Scalable Exploration of Relevance Prospects to Support Decision Making. Proceedings of the Joint Workshop on Interfaces and Human Decision Making for Recommender Systems co-located with ACM Conference on Recommender Systems (RecSys 2016), Boston, MA, USA, September 16, 2016.
Agents vs Users: Visual Recommendation of Research Talks with Multiple Dimens...Katrien Verbert
Published in ACM TiiS: Verbert, K., Parra, D., & Brusilovsky, P. (2016). Agents Vs. Users: Visual Recommendation of Research Talks with Multiple Dimension of Relevance. ACM Transactions on Interactive Intelligent Systems (TiiS), 6(2), 11.
Presented at IUI 2017
Tutorial at UMAP 2022:
In recent years, the use of Artificial Intelligence (AI) technologies expanded to many areas where they directly affect the lives of many
people. AI-based approaches advise human decision-makers who should be released on bail, whether it is a good time to discharge a
patient from a hospital and whether a specific student is at risk to fail a course. Such an extensive use in AI in decision making came with
a range of protentional problems that have been extensively studied over the last few years. Recognition of these problems motivated a
rapid rise of research on “human-centered AI”, which attempted to address and minimize the negative effects of using AI technologies.
Among the ideas of human-centered AI is user control - engaging users in affecting AI decision making to prevent possible errors and
biases. In my talk, I will focus on the application of user control in one popular area of AI application, adaptive information access.
Adaptive information access systems such as personalized search and recommender systems attempt to model their users to help them in
finding the most relevant information. Yet, user modeling and personalization mechanisms might not always work as expected resulting
in errors, biases, and suboptimal behavior. Combining the decision power or AI with the ability of the user to guide and control it brings
together the strong sides of artificial and human intelligence and could lead to better results. This tutorial will provide a systematic review
of approaches focused on adding various kinds of user control to adaptive information access systems and discuss lessons learned,
prospects, and challenges of this direction of research.
Towards Collaboration Translucence: Giving Meaning to Multimodal Group DataSimon Buckingham Shum
Vanessa Echeverria, Roberto Martinez-Maldonado, and Simon Buck- ingham Shum.. 2019. Towards Collaboration Translucence: Giving Meaning to Multimodal Group Data. In Proceedings of ACM CHI conference (CHI’19). ACM, New York, NY, USA, Paper 39, 16 pages. https://doi.org/10.1145/3290605.3300269
Collocated, face-to-face teamwork remains a pervasive mode of working, which is hard to replicate online. Team members’ embodied, multimodal interaction with each other and artefacts has been studied by researchers, but due to its complexity, has remained opaque to automated analysis. However, the ready availability of sensors makes it increasingly affordable to instrument work spaces to study teamwork and groupwork. The possibility of visualising key aspects of a collaboration has huge potential for both academic and professional learning, but a frontline challenge is the enrichment of quantitative data streams with the qualitative insights needed to make sense of them. In response, we introduce the concept of collaboration translucence, an approach to make visible selected features of group activity. This is grounded both theoretically (in the physical, epistemic, social and affective dimensions of group activity), and contextually (using domain-specific concepts). We illustrate the approach from the automated analysis of healthcare simulations to train nurses, generating four visual proxies that fuse multimodal data into higher order patterns.
Leveraging Graph Neural Networks for User Profiling: Recent Advances and Open...Erasmo Purificato
Slide of the tutorial entitled "Leveraging Graph Neural Networks for User Profiling: Recent Advances and Open Challenges" held at CIKM'23: 32nd ACM International Conference on Information and Knowledge Management (October 21, 2023 | Birmingham, United Kingdom)
Jenny Preece, dean of University of Maryland's iSchool, discusses people, technology and information involved in citizen science. From a presentation given at the University of British Columbia, September 24, 2014.
User Control in AIED (Artificial Intelligence in Education)Peter Brusilovsky
Slides of my intro to "Meet the Expert" session at AIED 2021. This is a subset of slides of a longer presentation on user control in AI extended with many specific examples from AIED area.
Scalable Exploration of Relevance Prospects to Support Decision MakingKatrien Verbert
Presented at IntRS 2016 - Interfaces and Human Decision Making for Recommender Systems, workshop at RecSys 2016
Citation: Verbert, K., Seipp, K., He, C., Parra, D., Wongchokprasitti, C., & Brusilovsky, P. (2016). Scalable Exploration of Relevance Prospects to Support Decision Making. Proceedings of the Joint Workshop on Interfaces and Human Decision Making for Recommender Systems co-located with ACM Conference on Recommender Systems (RecSys 2016), Boston, MA, USA, September 16, 2016.
Agents vs Users: Visual Recommendation of Research Talks with Multiple Dimens...Katrien Verbert
Published in ACM TiiS: Verbert, K., Parra, D., & Brusilovsky, P. (2016). Agents Vs. Users: Visual Recommendation of Research Talks with Multiple Dimension of Relevance. ACM Transactions on Interactive Intelligent Systems (TiiS), 6(2), 11.
Presented at IUI 2017
Tutorial at UMAP 2022:
In recent years, the use of Artificial Intelligence (AI) technologies expanded to many areas where they directly affect the lives of many
people. AI-based approaches advise human decision-makers who should be released on bail, whether it is a good time to discharge a
patient from a hospital and whether a specific student is at risk to fail a course. Such an extensive use in AI in decision making came with
a range of protentional problems that have been extensively studied over the last few years. Recognition of these problems motivated a
rapid rise of research on “human-centered AI”, which attempted to address and minimize the negative effects of using AI technologies.
Among the ideas of human-centered AI is user control - engaging users in affecting AI decision making to prevent possible errors and
biases. In my talk, I will focus on the application of user control in one popular area of AI application, adaptive information access.
Adaptive information access systems such as personalized search and recommender systems attempt to model their users to help them in
finding the most relevant information. Yet, user modeling and personalization mechanisms might not always work as expected resulting
in errors, biases, and suboptimal behavior. Combining the decision power or AI with the ability of the user to guide and control it brings
together the strong sides of artificial and human intelligence and could lead to better results. This tutorial will provide a systematic review
of approaches focused on adding various kinds of user control to adaptive information access systems and discuss lessons learned,
prospects, and challenges of this direction of research.
Towards Collaboration Translucence: Giving Meaning to Multimodal Group DataSimon Buckingham Shum
Vanessa Echeverria, Roberto Martinez-Maldonado, and Simon Buck- ingham Shum.. 2019. Towards Collaboration Translucence: Giving Meaning to Multimodal Group Data. In Proceedings of ACM CHI conference (CHI’19). ACM, New York, NY, USA, Paper 39, 16 pages. https://doi.org/10.1145/3290605.3300269
Collocated, face-to-face teamwork remains a pervasive mode of working, which is hard to replicate online. Team members’ embodied, multimodal interaction with each other and artefacts has been studied by researchers, but due to its complexity, has remained opaque to automated analysis. However, the ready availability of sensors makes it increasingly affordable to instrument work spaces to study teamwork and groupwork. The possibility of visualising key aspects of a collaboration has huge potential for both academic and professional learning, but a frontline challenge is the enrichment of quantitative data streams with the qualitative insights needed to make sense of them. In response, we introduce the concept of collaboration translucence, an approach to make visible selected features of group activity. This is grounded both theoretically (in the physical, epistemic, social and affective dimensions of group activity), and contextually (using domain-specific concepts). We illustrate the approach from the automated analysis of healthcare simulations to train nurses, generating four visual proxies that fuse multimodal data into higher order patterns.
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Slide of the tutorial entitled "Leveraging Graph Neural Networks for User Profiling: Recent Advances and Open Challenges" held at CIKM'23: 32nd ACM International Conference on Information and Knowledge Management (October 21, 2023 | Birmingham, United Kingdom)
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2. Human-Computer Interaction group
recommender systems – visualization – intelligent user interfaces
Learning analytics
Media
consumption
Research Information
Systems
Wellness
& health
Augment prof. Katrien Verbert
ARIA
prof. Adalberto
Simeone
Computer
Graphics
prof. Phil Dutré
Language
Intelligence &
Information
Retrieval
prof. Sien Moens
3. Augment/HCI team
Robin De Croon
Postdoc researcher
Katrien Verbert
Associate Professor
Francisco Gutiérrez
PhD researcher
Tom Broos
PhD researcher
Martijn Millecamp
PhD researcher
Sven Charleer
Postdoc researcher
Nyi Nyi Htun
Postdoc researcher
Houda Lamqaddam
PhD researcher
Yucheng Jin
PhD researcher
Oscar Alvarado
PhD researcher
http://augment.cs.kuleuven.be/
Diego Rojo Carcia
PhD researcher
4. Interactive recommender systems
Core objectives:
• Explaining recommendations to increase user trust and acceptance
• Enable users to interact with the recommendation process
7. Interactive recommender systems
¤ Transparency: explaining the rational of recommendations
¤ User control: closing the gap between browse and search
¤ Diversity – novelty
¤ Cold start
¤ Context-aware interfaces
7
He, C., Parra, D. and Verbert, K., 2016. Interactive recommender systems: A survey
of the state of the art and future research challenges and opportunities. Expert
Systems with Applications, 56, pp.9-27.
8. Flexible interaction with RecSys
Research visit
¤ Host: Carnegie Mellon
University & University of
Pittsburg
¤ Collaboration: John Stamper,
Peter Brusilovsky, Denis Parra
¤ Period: April 2012 – June 2012
Second post-doctoral
fellowship FWO
¤ host university: KU Leuven,
Belgium
¤ supervisor: Erik Duval
¤ period: Oct 2012 – Sept 2015
8
9. Overview research topics
9
2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018
Learning Analytics - Media Consumption – Research Information Systems - Healthcare
12. Contributions
¤ new approach to support exploration, transparency
and controllability
¤ recommender systems are shown as agents
¤ in parallel to real users and tags
¤ users can interrelate entities to find items
¤ evaluation study that assesses
¤ effectiveness
¤ probability of item selection
12
Verbert, K., Parra, D., Brusilovsky, P., & Duval, E. (2013). Visualizing recommendations
to support exploration, transparency and controllability. In Proceedings of the IUI
2013 international conference on Intelligent user interfaces (pp. 351-362). ACM.
14. Results of studies 1 & 2
¤ Effectiveness: #
bookmarked items /
#explorations
¤ Effectiveness increases with
intersections of more
entities
¤ Effectiveness wasn’t
affected in the field study
(study 2)
¤ … but exploration
distribution was affected
14
Average effectiveness
Total number of explorations
Verbert, K., Parra, D., & Brusilovsky, P. (2016). Agents vs. users: Visual recommendation of research
talks with multiple dimension of relevance. ACM Transactions on Interactive Intelligent Systems
(TIIS), 6(2), 11.
16. Three user studies
¤ Study 1:
¤ Within-subjects study with 20 users
¤ baseline: exploration of recommendations in CN3
¤ Second condition: exploration of recommendations in IEx
¤ Data from two conferences EC-TEL 2014, EC-TEL 2015
¤ Study 2:
¤ Field study at Digital Humanities conference
¤ + 1000 participants, less technically oriented
¤ Study 3:
¤ Field study at IUI conference
¤ Smaller scale, technical audience
16
17. Study 1 vs Study 2 vs Study 3
¤ Overall combinations of users and agents (“augmented
agents”) were used in all three studies
¤ Precision scores significantly higher for augmented agents in
study 1 and study 3
¤ Participants of study 2 (Digital Humanities)
¤ more interested in content perspective
¤ Rated several dimensions lower (use intention, fun, information
sufficiency, control)
17
Cardoso, B., Sedrakyan, G., Gutiérrez, F., Parra, D., Brusilovsky, P., & Verbert, K. (2018). IntersectionExplorer, a
multi-perspective approach for exploring recommendations. International Journal of Human-Computer Studies.
18. Overview research topics
18
2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018
Learning analytics - Media Consumption – Research Information Systems - Healthcare
20. Personal characteristics
Need for cognition
•Measurement of the tendency for an individual to engage in, and enjoy, effortful cognitive
activities
•Measured by test of Cacioppo et al. [1984]
Visualisation literacy
•Measurement of the ability to interpret and make meaning from information presented in the form
of images and graphs
•Measured by test of Boy et al. [2014]
Locus of control (LOC)
•Measurement of the extent to which people believe they have power over events in their lives
•Measured by test of Rotter et al. [1966]
Visual working memory
•Measurement of the ability to recall visual patterns [Tintarev and Mastoff, 2016]
•Measured by Corsi block-tapping test
Musical experience
•Measurement of the ability to engage with music in a flexible, effective and nuanced way
[Müllensiefen et al., 2014]
•Measured using the Goldsmiths Musical Sophistication Index (Gold-MSI)
Tech savviness
•Measured by confidence in trying out new technology 20
21. User study
¤ Within-subjects design: 105 participants recruited with Amazon Mechanical Turk
¤ Baseline version (without explanations) compared with explanation interface
¤ Pre-study questionnaire for all personal characteristics
¤ Task: Based on a chosen scenario for creating a play-list, explore songs and
rate all songs in the final playlist
¤ Post-study questionnaire:
¤ Recommender effectiveness
¤ Trust
¤ Good understanding
¤ Use intentions
¤ Novelty
¤ Satisfaction
¤ Confidence
23. Design implications
¤ Explanations should be personalised for different groups of
end-users.
¤ Users should be able to choose whether or not they want to
see explanations.
¤ Explanation components should be flexible enough to present
varying levels of details depending on a user’s preference.
23
24. User control
Users tend to be more satisfied when they have control over
how recommender systems produce suggestions for them
(Konstan and Riedl, 2012)
Control recommendations
Douban FM
Control user profile
Spotify
Control algorithm parameters
TasteWeights
26. Different levels of user control
26
Level
Recommender
components
Controls
low
Recommendations
(REC)
Rating, removing, and
sorting
medium User profile (PRO)
Select which user profile
data will be considered by
the recommender
high
Algorithm parameters
(PAR)
Modify the weight of
different parameters
Jin, Y., Tintarev, N., & Verbert, K. (2018, September). Effects of personal characteristics on music
recommender systems with different levels of controllability. In Proceedings of the 12th ACM Conference
on Recommender Systems (pp. 13-21). ACM.
27. User profile (PRO) Algorithm parameters (PAR) Recommendations (REC)
8 control settings
No control
REC
PAR
PRO
REC*PRO
REC*PAR
PRO*PAR
REC*PRO*PAR
28. Evaluation method
¤ Between-subjects – 240 participants recruited with AMT
¤ Independent variable: settings of user control
¤ 2x2x2 factorial design
¤ Dependent variables:
¤ Acceptance (ratings)
¤ Cognitive load (NASA-TLX), Musical Sophistication, Visual Memory
¤ Framework Knijnenburg et al. [2012]
29. Results
¤ Main effects: from REC to PRO to PAR → higher cognitive
load
¤ Two-way interaction: does not necessarily result in higher
cognitive load. Adding an additional control component
to PAR increases the acceptance. PRO*PAR has less
cognitive load than PRO and PAR
¤ High Musical Sofistication leads to higher quality, and
thereby result in higher acceptance
29
30. Overview research topics
30
2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018
Learning Analytics - Media Consumption – Research Information Systems - Healthcare
36. Peter Brusliovsky Nava Tintarev Cristina ConatiDenis Parra
Collaborations
Bart Knijnenburg Jurgen Ziegler
37. Open PhD and Postdoc positions
¤ PhD/Postdoc position on Human-Computer Interaction:
the focus of this research position is on user interfaces for
recommender systems
¤ PhD position on Visual Analytics for Healthcare
37
http://augment.cs.kuleuven.be
39. References
¤ Boy, J., Rensink, R. A., Bertini, E., & Fekete, J. D. (2014). A principled way of assessing visualization
literacy. IEEE transactions on visualization and computer graphics, 20(12), 1963-1972.
¤ Cacioppo, J.T., Petty, R.E. and Feng Kao, C., 1984. The efficient assessment of need for cognition.
Journal of personality assessment, 48(3), pp.306-307.
¤ B. P. Knijnenburg, M. C. Willemsen, Z. Gantner, H. Soncu, and C. Newell. Explaining the user
experience of recommender systems. User Modeling and User-Adapted Interaction, 22(4-5):441–504,
2012.
¤ Konstan, J.A. and Riedl, J., 2012. Recommender systems: from algorithms to user experience. User
modeling and user-adapted interaction, 22(1-2), pp.101-123.
¤ Müllensiefen, D., Gingras, B., Musil, J., & Stewart, L. (2014). The musicality of non-musicians: an index
for assessing musical sophistication in the general population. PloS one, 9(2), e89642.
¤ Rotter, J. B. (1966). Generalized expectancies for internal versus external control of reinforcement.
Psychological monographs: General and applied, 80(1), 1.
¤ Tintarev, N., & Masthoff, J. (2016). Effects of Individual Differences in Working Memory on Plan
Presentational Choices. Frontiers in psychology, 7, 1793.