Pang Wei Koh

pangwei@cs.washington.edu | My first name is "Pang Wei"

Assistant Professor, Allen School of Computer Science & Engineering
University of Washington

CV | bio | twitter | github | google scholar


I am interested in how we can make machine learning systems more useful to society and more reliable in real-world application contexts. For example:

  • Adaptation. Today's foundation models can access the sum total of human knowledge through natural language. How do we harness this knowledge and adapt these models to particular domains and applications?
  • Reliability. How do we make our models more reliable under distribution shifts, more factual and up-to-date, and better calibrated about what they know? And how can we mitigate issues of bias, copyright, privacy, and disinformation?
  • Interaction. How can AI systems best augment and interact with their human end-users? Conversely, what kind of human supervision and feedback would let us train more robust models?

I received my PhD in Computer Science from Stanford, advised by Percy Liang. Before that, I was the 3rd employee and Director of Partnerships at Coursera. I was also an undergraduate at Stanford, advised by Andrew Ng and Daphne Koller.

I am part of the UW ML and NLP groups, and I'm also a visiting research scientist at AI2. If you're interested in joining our group, please read this.

Current students

Alumni

  • Irena Gao (MS 2023, now PhD student at Stanford University)
  • Kendrick Shen (MS 2022, now ML research engineer at Genesis Therapeutics)
  • Henrik Marklund (MS 2021, now PhD student at Stanford University)
  • Kai-Siang Ang (MS 2021, now ML engineer at Nuro)
  • Erik Jones (MS 2020, now PhD student at UC Berkeley)
  • Hubert Teo (MS 2019, now senior software engineer at Flock Freight)
  • Thao Nguyen (BS 2019, now PhD student at the University of Washington)
  • Yew-Siang Tang (BS 2019, now senior software engineer at You.com)

Publications

* = equal contribution.

The unmet promise of synthetic training images: Using retrieved real images performs better
Scott Geng, Cheng-Yu Hsieh, Vivek Ramanujan, Matthew Wallingford, Chun-Liang Li, Pang Wei Koh, Ranjay Krishna
arXiv 2024
MEDIQ: Question-asking LLMs for adaptive and reliable clinical reasoning
Shuyue Stella Li, Vidhisha Balachandran, Shangbin Feng, Jonathan Ilgen, Emma Pierson, Pang Wei Koh, Yulia Tsvetkov
arXiv 2024
Multilingual diversity improves vision-language representations
Thao Nguyen, Matthew Wallingford, Sebastin Santy, Wei-Chiu Ma, Sewoong Oh, Ludwig Schmidt, Pang Wei Koh, Ranjay Krishna
arXiv 2024
Using unlabeled data to enhance fairness of medical AI
Rajiv Movva, Pang Wei Koh, and Emma Pierson
Nature Medicine 2024
Information-theoretic distillation for reference-less summarization
Jaehun Jung, Ximing Lu, Liwei Jiang, Faeze Brahman, Peter West, Pang Wei Koh, Yejin Choi
arXiv 2024
Reliable, adaptable, and attributable language models with retrieval
Akari Asai, Zexuan Zhong, Danqi Chen, Pang Wei Koh, Luke Zettlemoyer, Hannaneh Hajishirzi, and Wen-tau Yih
arXiv 2024
Uncertainty of Thoughts: Uncertainty-aware planning enhances information seeking in large language models
Zhiyuan Hu, Chumin Liu, Xidong Feng, Yilun Zhao, See-Kiong Ng, Anh Tuan Luu, Junxian He, Pang Wei Koh, and Bryan Hooi
arXiv 2024
Instructional fingerprinting of large language models
Jiashu Xu, Fei Wang, Mingyu Derek Ma, Pang Wei Koh, Chaowei Xiao, and Muhao Chen
NAACL 2024
The generative AI paradox: "What it can create, it may not understand"
Peter West*, Ximing Lu*, Nouha Dziri*, Faeze Brahman*, Linjie Li*, Jena D. Hwang, Liwei Jiang, Jillian Fisher, Abhilasha Ravichander, Khyathi Chandu, Benjamin Newman, Pang Wei Koh, Allyson Ettinger, and Yejin Choi
ICLR 2024
Leveraging domain relations for domain generalization
Huaxiu Yao*, Xinyu Yang*, Xinyi Pan, Shengchao Liu, Pang Wei Koh, Chelsea Finn
ICLR 2024
Spotlight paper
Impossibility theorems for feature attribution
Blair Bilodeau, Natasha Jaques, Pang Wei Koh, and Been Kim
Proceedings of the National Academy of Sciences (PNAS) 2024
Retrieval-based language models using a multi-domain datastore
Rulin Shao, Sewon Min, Luke Zettlemoyer, and Pang Wei Koh
NeurIPS Workshop on Distributution Shifts (DistShift) 2023
Use large language models to promote equity
Emma Pierson*, Divya Shanmugam*, Rajiv Movva*, Jon Kleinberg*, Monica Agrawal, Mark Dredze, Kadija Ferryman, Judy Wawira Gichoya, Dan Jurafsky, Pang Wei Koh, Karen Levy, Sendhil Mullainathan, Ziad Obermeyer, Harini Suresh, and Keyon Vafa
arXiv 2023
OpenFlamingo: An open-source framework for training large autoregressive vision-language models
Anas Awadalla*, Irena Gao*, Josh Gardner, Jack Hessel, Yusuf Hanafy, Wanrong Zhu, Kalyani Marathe, Yonatan Bitton, Samir Gadre, Shiori Sagawa, Jenia Jitsev, Simon Kornblith, Pang Wei Koh, Gabriel Ilharco, Mitchell Wortsman, and Ludwig Schmidt
arXiv 2023
FActScore: Fine-grained atomic evaluation of factual precision in long form text generation
Sewon Min, Kalpesh Krishna, Xinxi Lyu, Mike Lewis, Wen-tau Yih, Pang Wei Koh, Mohit Iyyer, Luke Zettlemoyer, and Hannaneh Hajishirzi
EMNLP 2023
DataComp: In search of the next generation of multimodal datasets
Samir Yitzhak Gadre*, Gabriel Ilharco*, Alex Fang*, Jonathan Hayase, Georgios Smyrnis, Thao Nguyen, Ryan Marten, Mitchell Wortsman, Dhruba Ghosh, Jieyu Zhang, Eyal Orgad, Rahim Entezari, Giannis Daras, Sarah Pratt, Vivek Ramanujan, Yonatan Bitton, Kalyani Marathe, Stephen Mussmann, Richard Vencu, Mehdi Cherti, Ranjay Krishna, Pang Wei Koh, Olga Saukh, Alexander Ratner, Shuran Song, Hannaneh Hajishirzi, Ali Farhadi, Romain Beaumont, Sewoong Oh, Alex Dimakis, Jenia Jitsev, Yair Carmon, Vaishaal Shankar, and Ludwig Schmidt
NeurIPS (Datasets and Benchmarks Track) 2023
Oral presentation
Proximity-informed calibration for deep neural networks
Miao Xiong, Ailin Deng, Pang Wei Koh, Jiaying Wu, Shen Li, Jianqing Xu, and Bryan Hooi
NeurIPS 2023
Spotlight paper
Are aligned neural networks adversarially aligned?
Nicholas Carlini, Milad Nasr, Christopher A Choquette-Choo, Matthew Jagielski, Irena Gao, Anas Awadalla, Pang Wei Koh, Daphne Ippolito, Katherine Lee, Florian Tramer, and Ludwig Schmidt
NeurIPS 2023
On the trade-off of intra-/inter-class diversity for supervised pre-training
Jieyu Zhang*, Bohan Wang*, Zhengyu Hu, Pang Wei Koh, and Alexander Ratner
NeurIPS 2023
Out-of-distribution robustness via targeted augmentations
Irena Gao*, Shiori Sagawa*, Pang Wei Koh, Tatsunori Hashimoto, and Percy Liang
ICML 2023
Wild-Time: A benchmark of in-the-wild distribution shift over time
Huaxiu Yao*, Caroline Choi*, Yoonho Lee, Pang Wei Koh, and Chelsea Finn
NeurIPS (Datasets and Benchmarks Track) 2022
Extending the WILDS benchmark for unsupervised adaptation
Shiori Sagawa*, Pang Wei Koh*, Tony Lee*, Irena Gao*, Sang Michael Xie, Kendrick Shen, Ananya Kumar, Weihua Hu, Michihiro Yasunaga, Henrik Marklund, Sara Beery, Etienne David, Ian Stavness, Wei Guo, Jure Leskovec, Kate Saenko, Tatsunori Hashimoto, Sergey Levine, Chelsea Finn, and Percy Liang
ICLR 2022
Oral presentation
WILDS: A benchmark of in-the-wild distribution shifts
Pang Wei Koh*, Shiori Sagawa*, Henrik Marklund, Sang Michael Xie, Marvin Zhang, Akshay Balsubramani, Weihua Hu, Michihiro Yasunaga, Richard Lanas Phillips, Irena Gao, Tony Lee, Etienne David, Ian Stavness, Wei Guo, Berton A. Earnshaw, Imran S. Haque, Sara Beery, Jure Leskovec, Anshul Kundaje, Emma Pierson, Sergey Levine, Chelsea Finn, and Percy Liang
ICML 2021
Oral presentation. Covered by articles in Science Magazine and Stanford Magazine.
Just Train Twice: Improving group robustness without training group information
Evan Zheran Liu*, Behzad Haghgoo*, Annie S. Chen*, Aditi Raghunathan, Pang Wei Koh, Shiori Sagawa, Percy Liang, and Chelsea Finn
ICML 2021
Oral presentation
Accuracy on the line: On the strong correlation between out-of-distribution and in-distribution generalization
John Miller, Rohan Taori, Aditi Raghunathan, Shiori Sagawa, Pang Wei Koh, Vaishaal Shankar, Percy Liang, Yair Carmon, and Ludwig Schmidt
ICML 2021
Supporting COVID-19 policy response with large-scale mobility-based modeling
Serina Chang, Mandy L. Wilson, Bryan Lewis, Zakaria Mehrab, Komal K. Dudakiya, Emma Pierson, Pang Wei Koh, Jaline Gerardin, Beth Redbird, David Grusky, Madhav Marathe, Jure Leskovec
KDD (Applied Data Science track) 2021
Best paper award
On the opportunities and risks of foundation models
Rishi Bommasani, Drew A. Hudson, ..., Pang Wei Koh, ..., and Percy Liang (116 authors, alphabetical within ellipses)
arXiv 2021
Selective classification can magnify disparities across groups
Erik Jones*, Shiori Sagawa*, Pang Wei Koh*, Ananya Kumar, and Percy Liang
ICLR 2021
Spotlight talk at the NeurIPS 2020 ICBINB Workshop
Also presented at the NeurIPS 2020 Algorithmic Fairness Workshop
Stronger data poisoning attacks break data sanitization defenses
Pang Wei Koh*, Jacob Steinhardt*, and Percy Liang
Machine Learning 2021
First published on arXiv in 2018. The 2021 version has the same content but was edited for clarity.
Mobility network models of COVID-19 explain inequities and inform reopening
Serina Y Chang*, Emma Pierson*, Pang Wei Koh*, Jaline Gerardin, Beth Redbird, David Grusky, and Jure Leskovec
Nature 2021
Commentary in Nature News and Views by Kevin Ma and Marc Lipsitch
Interactive article in The New York Times by Yaryna Serkez
Other press by The New York Times; The Washington Post; The Telegraph; Bloomberg; CNN; MIT Technology Review; Wired; STAT; and Stanford News
Also presented at NetSci 2021 (oral), the NeurIPS 2020 ML for Health Workshop, and the NeurIPS 2020 COVID-19 Symposium (invited talk).
Concept bottleneck models
Pang Wei Koh*, Thao Nguyen*, Yew Siang Tang*, Steve Mussmann, Emma Pierson, Been Kim, and Percy Liang
ICML 2020
Spotlight talk at the ICML 2020 Workshop on Human Interpretability in Machine Learning
An investigation of why overparameterization exacerbates spurious correlations
Shiori Sagawa*, Aditi Raghunathan*, Pang Wei Koh*, and Percy Liang
ICML 2020
ExpBERT: Representation engineering with natural language explanations
Shikhar Murty, Pang Wei Koh, and Percy Liang
ACL 2020
Toward trustworthy AI development: Mechanisms for supporting verifiable claims
Miles Brundage*, Shahar Avin*, Jasmine Wang*, Haydn Belfield*, Gretchen Krueger*, Gillian Hadfield, Heidy Khlaaf, Jingying Yang, Helen Toner, Ruth Fong, Tegan Maharaj, Pang Wei Koh, Sara Hooker, ..., Thomas Krendl Gilbert, Lisa Dyer, Saif Khan, Yoshua Bengio, and Markus Anderljung
arXiv 2020
Distributionally robust neural networks for group shifts: On the importance of regularization for worst-case generalization
Shiori Sagawa*, Pang Wei Koh*, Tatsunori B. Hashimoto, and Percy Liang
ICLR 2020
On the accuracy of influence functions for measuring group effects
Pang Wei Koh*, Kai-Siang Ang*, Hubert H. K. Teo*, and Percy Liang
NeurIPS 2019
Temporal FiLM: Capturing long-range sequence dependencies with feature-wise modulations
Sawyer Birnbaum*, Volodymyr Kuleshov*, Zayd Enam, Pang Wei Koh, Stefano Ermon
NeurIPS 2019
Inferring multi-dimensional rates of aging from cross-sectional data
Emma Pierson*, Pang Wei Koh*, Tatsunori B. Hashimoto*, Daphne Koller, Jure Leskovec, Nicholas Eriksson, and Percy Liang
AISTATS 2019
Contributed talk at the ICML/IJCAI 2018 Workshop on Computational Biology
Spotlight talk at the NeurIPS 2018 Workshop on Machine Learning for Health
Certified defenses for data poisoning attacks
Jacob Steinhardt*, Pang Wei Koh*, and Percy Liang
NeurIPS 2017
Understanding black-box predictions via influence functions
Pang Wei Koh and Percy Liang
ICML 2017
Best paper award
Localized hepatic lobular regeneration by central-vein-associated lineage-restricted progenitors
Jonathan M. Tsai, Pang Wei Koh, Ania Stefanska, Liujing Xing, Graham G. Walmsley, Nicolas Poux, Irving L. Weissman, and Yuval Rinkevich
Proceedings of the National Academy of Sciences (PNAS) 2017
An atlas of transcriptional, chromatin accessibility, and surface marker changes in human mesoderm development
Pang Wei Koh*, Rahul Sinha*, Amira A. Barkal, Rachel M. Morganti, Angela Chen, Irving L. Weissman, Lay Teng Ang, Anshul Kundaje, and Kyle M. Loh
Scientific Data 2016
Mapping the pairwise choices leading from pluripotency to human bone, heart, and other mesoderm cell types
Kyle M. Loh*, Angela Chen*, Pang Wei Koh, Tianda Z. Deng, Rahul Sinha, Jonathan M. Tsai, Amira A. Barkal, Kimberle Y. Shen, Rajan Jain, Rachel M. Morganti, Ng Shyh-Chang, Nathaniel B. Fernhoff, Benson M. George, Gerlinde Wernig, Rachel E.A. Salomon, Zhenghao Chen, Hannes Vogel, Jonathan A. Epstein, Anshul Kundaje, William S. Talbot, Philip A. Beachy, Lay Teng Ang, and Irving L. Weissman
Cell 2016
Denoising genome-wide histone ChIP-seq with convolutional neural networks
Pang Wei Koh*, Emma Pierson*, and Anshul Kundaje
Intelligent Systems for Molecular Biology (ISMB) / Bioinformatics 2017
Spotlight talk and best poster award at the ICML 2016 Workshop on Computational Biology
Top 10 papers of 2016-2017 in regulatory and systems genomics at RECOMB/ISCB
Dissecting an online intervention for cancer survivors
Zhenghao Chen, Pang Wei Koh, Philip L. Ritter, Kate Lorig, Erin O'Carroll Bantum, and Suchi Saria
Health Education & Behavior 2014
Peer and self assessment in massive online classes
Chinmay Kulkarni, Pang Wei Koh, Huy Le, Daniel Chia, Kathryn Papadopoulos, Justin Cheng, Daphne Koller, and Scott Klemmer
ACM Transactions on Computer-Human Interaction 2013
Identifying genetic drivers of cancer morphology
Pang Wei Koh, Andrew Beck, and Daphne Koller.
Undergraduate honors thesis 2012
Firestone Medal for Excellence in Research
Ben Wegbreit Prize for Best Undergraduate Honors Thesis in Computer Science
David M. Kennedy Honors Thesis Prize (best thesis in Stanford Engineering & Appl. Sciences)
Undergraduate Award in Computer Science (an international research award)
Sparse filtering
Jiquan Ngiam, Pang Wei Koh, Zhenghao Chen, Sonia Bhaskar, and Andrew Y. Ng
NeurIPS 2011
Spotlight paper
Learning deep energy models
Jiquan Ngiam, Zhenghao Chen, Pang Wei Koh, and Andrew Y. Ng
ICML 2011
On random weights and unsupervised feature learning
Andrew Saxe, Pang Wei Koh, Zhenghao Chen, Maneesh Bhand, Bipin Suresh, and Andrew Y. Ng
ICML 2011
Tiled convolutional neural networks
Quoc V. Le, Jiquan Ngiam, Zhenghao Chen, Daniel Chia, Pang Wei Koh, and Andrew Y. Ng
NeurIPS 2010
Lower bound on the time complexity of local adiabatic evolution
Zhenghao Chen, Pang Wei Koh, and Zhao Yan
Physical Review A 2006