Hi, I'm an Assistant Professor in the School of Electrical Engineering and Computer Science at Oregon State University, where I lead the Data Interaction and Visualization (DIV) Lab.
My research focuses on building novel visual analytics tools for people to easily explore, interpret, and interact with machine learning systems and large datasets. To do this, I combine data-driven scalable techniques and human-centered interactive approaches, by using methods in data visualization, Explainable AI, human-computer interaction (HCI), and databases.
I earned a PhD in computer science at Georgia Tech with a Dissertation Award. I was fortunate to work with amazing people at Google and Facebook, resulting in deployed and open-sourced systems. My research has been supported by NSF, DARPA, Google, and Facebook.
Research Interests
My students and I are currently working on research in the following topics:- Visual analytics for explaining errors in AI systems
- Intelligent user interfaces for exploring large video data
- Interactive analysis of bias and unfairness in AI
- Iterative ML development and debugging by interacting with datasets
News
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July 2021Two papers accepted for short presentations at IEEE VIS'21.
- Contrastive Identification of Covariate Shift in Image Data
- "Why did my AI agent lose?": Visual Analytics for Scaling Up AAR/AI - Apr 2021 Honored to receive the 2021 Georgia Tech College of Computing Dissertation Award.
- Mar 2021 Serving as a Program Committee member for IEEE VIS'21.
- Mar 2021 Our DARPA Explainable (XAI) grant has been extended for another year.
- Dec 2020 Our research will be supported by the NSF IUCRC PPI Center.
- Sept 2020 New paper on evaluting GAN Lab, accepted for IEEE VIS'20.
- Aug 2020 New paper, CNN Explainer, accepted for IEEE VIS'20 (TVCG track).
- Feb 2020 Our Chronodes paper nominated for the 2018 ACM TiiS Best Paper.
- July 2019 New paper, FairVis, on visual analysis of ML bias accepted to IEEE VIS'19.
Research Highlights
Education
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Ph.D. in Computer Science,
Georgia Institute of Technology, USA
2013-2019
Thesis: Human-Centered AI through Scalable Visual Data Analytics
Committee: Polo Chau, Sham Navathe, Alex Endert, Martin Wattenberg, Fernanda Viégas -
M.S. in Computer Science and Engineering,
Seoul National University, South Korea
2009-2011
Thesis: Context-Aware Recommendation using Learning-to-Rank - B.S. in Electrical and Computer Engineering, Seoul National University, South Korea 2005-2009
Industry Research Experience
- Google, Software Engineering Intern at Google Brain's People+AI Research Group Summer 2017
- Facebook, Research Intern at Applied ML Research Group Summer 2016
- Facebook, Research Intern at Applied ML Research Group Summer 2015
Awards (selected)
- 2021 College of Computing Dissertation Award, Georgia Tech 2021
- ACM Trans. Interactive Intelligent Systems (TiiS) 2018 Best Paper, Honorable Mention 2020
- Google PhD Fellowship, Google AI 2018-2019
- Graduate TA of the Year in School of Computer Science, Georgia Tech 2018
- NSF Graduate Research Fellowship, National Science Foundation 2014-2017
- Best Paper Award, PhD Workshop at CIKM 2011
- National Scholarship for Science and Engineering, Korea Student Aid Foundation 2005-2009
Publications (Selected) Full list (h-index: 18)
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Contrastive Identification of Covariate Shift in Image Data
IEEE Visualization Conference (VIS'21), 2021.
PDF -
"Why did my AI agent lose?": Visual Analytics for Scaling Up After-Action Review
IEEE Visualization Conference (VIS'21), 2021.
PDF -
CNN Explainer: Learning Convolutional Neural Networks with Interactive Visualization
IEEE Transactions on Visualization and Computer Graphics, 26(2) (VIS'20), 2021.
DOI PDF Demo Video Code -
How Does Visualization Help People Learn Deep Learning? Evaluation of GAN Lab with Observational Study and Log Analysis
IEEE Visualization Conference (VIS'20), 2020.
PDF -
FairVis: Visual Analytics for Discovering Intersectional Bias in Machine Learning
IEEE Conference on Visual Analytics Science and Technology (VIS'19), 2019.
DOI PDF arXiv Blog Code
Featured in the Data Stories podcast (link) -
GAN Lab: Understanding Complex Deep Generative Models using Interactive Visual Experimentation
IEEE Transactions on Visualization and Computer Graphics, 25(1) (VIS'18), 2019.
Open sourced with Google AI
DOI PDF Slides Code Website -
Visual Analytics in Deep Learning: An Interrogative Survey for the Next Frontiers
IEEE Transactions on Visualization and Computer Graphics, 25(8), 2019.
DOI PDF Website Medium
Most cited paper among all papers published in the journal in 2017-2021 (link) -
ActiVis: Visual Exploration of Industry-Scale Deep Neural Network Models
IEEE Transactions on Visualization and Computer Graphics, 24(1) (VIS'17), 2018.
Deployed on Facebook ML Platform; Invited to present at SIGGRAPH'18 as a top VIS paper
DOI PDF Video Slides Website -
Chronodes: Interactive Multifocus Exploration of Event Sequences
ACM Transactions on Interactive Intelligent Systems (TiiS), 8(1), 2018.
Best Paper, Honorable Mention
DOI PDF -
FACETS: Adaptive Local Exploration of Large Graphs
SIAM International Conference on Data Mining (SDM'17), 2017.
DOI PDF -
Interactive Browsing and Navigation in Relational Databases
Proceedings of the VLDB Endowment, 9(12) (VLDB'16), 2016.
DOI PDF Slides -
Visual Exploration of Machine Learning Results using Data Cube Analysis
Workshop on Human-In-the-Loop Data Analytics (HILDA at SIGMOD'16), 2016.
Deployed on Facebook ML Platform
DOI PDF Slides -
Understanding Variations in Pediatric Asthma Care Processes in the Emergency Department using Visual Analytics
Journal of the American Medical Informatics Association, 22(2) (Special Issue on Visual Analytics in Healthcare), 2015.
DOI -
GLO-STIX: Graph-Level Operations for Specifying Techniques and Interactive eXploration
IEEE Transactions on Visualization and Computer Graphics, 20(12) (InfoVis'14), 2014.
DOI PDF Video -
PathRank: A Novel Node Ranking Measure on a Heterogeneous Graph for Recommender Systems
ACM Conference on Information and Knowledge Management (CIKM'12), 2012.
DOI -
Exploiting Paths for Entity Search in RDF Graphs
ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR'12 Poster), 2012.
DOI PDF Poster -
Ranking Objects by Following Paths in Entity-Relationship Graphs
ACM Workshop for Ph.D. Students in Information and Knowledge Management (Ph.D. Workshop at CIKM'11), 2011.
Best Paper Award
DOI PDF Slides -
Ranking in Context-Aware Recommender Systems
International Conference on World Wide Web (WWW'11 Poster), 2011.
DOI PDF Poster -
Random Walk based Entity Ranking on Graph for Multidimensional Recommendation
ACM Conference on Recommender Systems (RecSys'11), 2011.
DOI PDF
Teaching
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CS 499/549. Visual Analytics (Special Topic; Selected Topic in Data Science & Systems)
Winter 2022
This new course introduces "visual analytics" which combine automated analysis techniques with interactive visualizations for understanding, reasoning, and decision making on the basis of large and complex data. Students will learn how to design and build interactive visual interfaces for humans to easily and effectively explore data and discover insights. This course is open to both undergraduate and graudate students. -
CS 565. Human-Computer Interaction
Spring 2022, Spring 2021, and Spring 2020
This course provides students with basic principles of and research methods in Human-Computer Interaction (HCI). Students will learn how to design and prototype user interfaces and interactive systems, based on the needs of users, and how to evaluate such interfaces and systems rigorously. -
CS 539. Data Visualization for ML (Selected Topic in AI)
Fall 2020
This course introduces advanced state-of-the-art research on interactive data visualization for machine learning. Students will learn how to design and develop interactive data visualization methods and tools that are interpretable to complex ML models (e.g., deep learning models), scalable to large data, and usable to a variety of users (e.g., ML researchers, practitioners like ML engineers and data scientists, non-expert learners).
Student Advising
Graduate Students
- Eric Slyman, AI PhD (co-advised by Stefan Lee), Fall 2021 - present Advisor
- Yashwanthi Anand, CS MS/PhD, Fall 2021 - present
- Montaser Hamid, CS PhD, Spring 2021 - present
- Delyar Tabatabai, CS MS, Winter 2021 - present
-
Roli Khanna,
CS MS, Spring 2020 - Spring 2021 (Graduated)
Thesis: Assessing and Finding Faults in AI: Two Empirical Studies - Dayeon Oh, CS MS, Spring 2020 - present
- Kin-Ho Lam, CS MS (Advisor: Alan Fern), Fall 2020 - present Co-advisor
- Matthew Olson, CS MS/PhD (Advisor: Weng-Keen Wong), Winter 2020 - present Collaborator
Undergraduate Students
- Donny Bertucci, CS, Winter 2020 - present
- Mark Ser, CS, Fall 2020 - Spring 2021 (OSU STEM Leader Program)
- Kristina Lee, CS, Fall 2020 - Winter 2021
- Anita Ruangrotsakun, CS BS/MS (AMP), Summer 2020 - present
- Thuy-Vy Nguyen, CS, Summer 2020 - Spring 2021 (Graduated; Now at Oracle)
- Junhyeok Jeong, CS, Winter 2020 - Fall 2020
Grants & Funding
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NSF National AI Research Institute
Title: USDA-NIFA Institute for Agricultural AI for Transforming Workforce and Decision Support
Senior Personnel (Lead PI: Ananth Kalyanaraman)
Total Amount: $20,000,000 (Period: 2021-26) -
DARPA Explainable Artificial Intelligence (XAI)
Title: xACT: Explanation-Informed Acceptance Testing of Deep Adaptive Programs
Co-PI (Lead PI: Alan Fern)
Total Amount: $6,500,000 + $600,000 (Period: 2017-21, 2021-22) -
NSF Industry-University Collaboration Research Center on Pervasive Personalized Intelligence
Project: Visual Analytics for Scalable AI Debugging
Project PI (Site PI: Weng-Keen Wong): Collaboration with NEC and Intel
Total Amount for OSU for Year 1: $64,000 (Period: 2021-present) -
Credit
Google Cloud Research Credit
Amount: $5,000, 2021 -
Fellowship
Google PhD Fellowship
Full Tuition + $35,000 for 2 years, 2018-2019 -
NSF Graduate Research Fellowship
Full Tuition + $34,000 for 3 years, 2014-2017
Professional Service
Workshop Co-Organizer
- KDD 2018 Workshop on Interactive Data Exploration and Analytics (IDEA 2018)
Journal Co-Editor
- ACM Transactions on Interactive Intelligent Systems (TiiS), Special Issue Highlights of IUI 2019
Conference Organizing Committee: Webmaster and Web Designer
- WSDM 2016
Conference Program Committee
- IUI 2019-22
- AAAI 2021–22
- IEEE VIS 2021
- IEEE VIS (Short Papers) 2020
- SDM 2020
- CIKM (Demo) 2019
- IUI (Poster and Demo) 2019
Workshop Program Committee
- Workshop on Visualization Meets AI (at PacificVis 2020-21)
- Symposium on Visualization in Data Science (at VIS 2018–19)
- Workshop on Big Data Tools, Methods, and Use Cases for Innovative Scientific Discovery (at BigData 2019)
- Workshop on Visualization for AI Explainability (at VIS 2018)
- KDD Workshop on Interactive Data Exploration and Analytics (IDEA 2016–17)
- Workshop on Visual Analytics for Deep Learning (at VIS 2017)
Journal Reviewer
- IEEE Transactions on Visualization and Computer Graphics (TVCG) (2019, 2021)
- ACM Transactions on Interactive Intelligent Systems (TiiS) (2020)
- ACM Transactions on Intelligent Systems and Technology (TIST) (2020)
- Distill (2019)
- ACM Transactions on Computer-Human Interaction (TOCHI) (2015, 2018)
- Expert Systems with Applications (2015)
Conference Reviewer
- CHI 2014, 2017–19, 2021
- CSCW 2020
- VIS 2018–20
- EuroVis 2018
- SDM 2014, 2016–17
- KDD 2014–16
- IUI 2016
- RecSys 2016
- SIGMOD 2013
- DASFAA 2011