Berk Ustun

@berkustun.bsky.social

Assistant Prof at UCSD. I work on safety, interpretability, and fairness in machine learning. www.berkustun.com

UK government project using AI to find benefit fraud resulted in: - A 46% false fraud rate - Anguish for families who were wrongly accused of fraud and had benefits stopped - Months of additional work for government, setting up a hotline, correcting false fraud www.theguardian.com/society/2025...

HMRC trial of child benefit crackdown wrongly suspected fraud in 46% of cases

Exclusive: Almost half of families flagged as emigrants based on Home Office travel data were still living in UK

theguardian.com

Machine learning models can assign fixed predictions that preclude individuals from changing their outcome. Think credit applicants that can never get a loan approved, or young patients that can never get an organ transplant - no matter how sick they are!

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ExplainableAI has long frustrated me by lacking a clear theory of what an explanation should do. Improve use of a model for what? How? Given a task what's max effect explanation could have? It's complicated bc most methods are functions of features & prediction but not true state being predicted 1/

Hey AI folks - stop using SHAP! It won't help you debug [1], won't catch discrimination [2], and makes no sense for feature importance [3]. Plus - as we show - it also won't give recourse. In a paper at #ICLR we introduce feature responsiveness scores... 1/ arxiv.org/pdf/2410.22598

Left: a feature-highlighting explanation generated by SHAP that shows multiple important features, however these include features that can not be changed (e.g., age, number of dependents) and features that even if they were changed would not result in a different outcome (e.g., credit utilization).

Right: a feature-highlighting explanation generated by our responsiveness scores showing only features that can be changed and which have the potential to result in a better outcome for the individual (multiple credit lines and monthly income).
Harry Cheon@scheon.com · last yr.

Denied a loan, an interview, or an insurance claim by machine learning models? You may be entitled to a list of reasons. In our latest w @anniewernerfelt.bsky.social @berkustun.bsky.social @friedler.net, we show how existing explanation frameworks fail and present an alternative for recourse

Many ML models predict labels that don’t reflect what we care about, e.g.: – Diagnoses from unreliable tests – Outcomes from noisy electronic health records In a new paper w/@berkustun, we study how this subjects individuals to a lottery of mistakes. Paper: bit.ly/3Y673uZ 🧵👇

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I'm seeking a postdoc to work with me and @kenholstein.bsky.social on evaluating AI/ML decision support for human experts: statmodeling.stat.columbia.edu/2024/12/10/p... P.S. I'll be at NeurIPS Thurs-Mon. Happy to talk about this position or related mutual interests! Please repost 🙏

Postdoc position at Northwestern on evaluating AI/ML decision support | Statistical Modeling, Causal Inference, and Social Science

statmodeling.stat.columbia.edu

My group is hiring postdoc(s) and I will be at #NeurIPS2024 if you want to talk - send me a DM or find me on Whova! UK-based, 2 year position. We work on AI/ML for health, specifically building and *understanding/explaining* deep (multimodal) models on healthcare data, especially medical imaging.

Personally I think they should have a superset of: (1) empower their students (2) foment collaborations (3) help produce clarity (4) intellectually move to their students not other way around (5) teach core skills (6) mentor effectively (7) produce a sense of safety and joy