Ryan Chan
@ryanchankh
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Machine Learning PhD at @penn. Interested in the theory and practice of interpretable and interactive machine learning.
Philadelphia, PA
Joined September 2021
Come check out our work at NeurIPS on Dec 5, Friday! Conformal Information Pursuit for Interactively Guiding Large Language Models Project Link: https://t.co/DZyHGQ9uZa Poster: Dec 5 (Friday), 11am-2pm, Exhibit Hall C,D,E #2811
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I wrote a review paper about statistical methods in generative AI; specifically, about using statistical tools along with genAI models for making AI more reliable, for evaluation, etc. See here: https://t.co/oNrb4dYe9i! I have identified four main areas where statistical
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Congratulations to @PennEngineers researchers featured at @NeurIPSConf, with work spanning LLMs, generative AI, trustworthy AI, neuroscience, health and more. #NeurIPS2025
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Come check out our work โ๐๐๐๐: ๐๐๐ฆ๐๐ง๐ญ๐ข๐๐๐ฅ๐ฅ๐ฒ ๐๐ช๐ฎ๐ข๐ฏ๐๐ฅ๐๐ง๐ญ ๐๐ง๐ ๐๐จ๐ก๐๐ซ๐๐ง๐ญ ๐๐ญ๐ญ๐๐๐ค๐ฌ ๐๐จ๐ซ ๐๐ฅ๐ข๐๐ข๐ญ๐ข๐ง๐ ๐๐๐ ๐๐๐ฅ๐ฅ๐ฎ๐๐ข๐ง๐๐ญ๐ข๐จ๐ง๐ฌโ at ๐๐๐ฎ๐ซ๐๐๐ 2025 in San Diego this Friday, December 5!
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Finally, I would like to thank my wonderful collaborators: Yuyan Ge @yuyan_ge, Edgar Dobriban @EdgarDobriban, Hamed Hassani @HamedSHassani, Renรฉ Vidal @vidal_rene.
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The long-term goal is to develop helpful and guided AI agents that can collaborate and cooperate with humans and other agents for better decision making, especially in high-stake domains such as helping doctors to make challenging but accurate diagnoses.
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While it seems straight-forward, it turns out expressing uncertainty in an LLM itself is a major challenge. To make it work, we had to leverage uncertainty quantification techniques such as conformal prediction to obtain calibrated measures of uncertainty.
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In an interactive QA setting, it means that at each iteration, the LLM agent selects the informative question that reduces the most uncertainty. And based on the answer to the question, it selects the next question; so on and so forth until it is confident to make a prediction.
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We begin by having LLM agents play a game called 20 Questions, where one LLM is thinking of some object, and the other has to guess the object by asking a small number of questions. The statistical principle that describes this process is known as Information Gain.
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With todayโs development in Large Language Models, itโs an interesting question to see whether AI agents can interact like humans do. Can LLM agents seek information dynamically like humans do? We explore this question in our work: Conformal Information Pursuit!
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As humans, we often interactively solve tasks together. Imagine you are feeling sick and going to the doctors. To make an accurate diagnosis, the doctor has to learn some information from you by asking you a sequence of questions.
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Concept cells stitch together, one by one, in imagination and memory. For instance, โShrek and Jennifer Aniston walk into a bar. โฆ Maybe Shrek orders a beer,โ suggested researcher Pieter Roelfsema. As you read this, itโs likely that concept cells โare building something in your
quantamagazine.org
Individual cells in the brain light up for specific ideas. These concept neurons, once known as โJennifer Aniston cells,โ help us think, imagine and remember episodes from our lives.
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PaCE: Parsimonious Concept Engineering for Large Language Models "we propose Parsimonious Concept Engineering (PaCE), a novel activation engineering framework for alignment. First, to sufficiently model the concepts, we construct a large-scale concept dictionary in the
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๐ Curious about how to interpret and steer your LLM? Want to accurately engineer your LLM's activation? ๐ Excited to introduce ๐๐๐๐: ๐๐๐ซ๐ฌ๐ข๐ฆ๐จ๐ง๐ข๐จ๐ฎ๐ฌ ๐๐จ๐ง๐๐๐ฉ๐ญ ๐๐ง๐ ๐ข๐ง๐๐๐ซ๐ข๐ง๐ ๐๐จ๐ซ ๐๐๐ซ๐ ๐ ๐๐๐ง๐ ๐ฎ๐๐ ๐ ๐๐จ๐๐๐ฅ๐ฌ! We generate a concept
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Penn Engineering is pleased to announce AI Month, a four-week series of events in April touching on AI's many facets and impact on engineering and technology. See the full list of events here: https://t.co/PFu6gnHzLA
#AIMonthatPenn
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Excited to see an executive order on pushing safe, secure, and trustworthy AI. Even more so because the order targets key current risks and tangible interventions to take today, unlike having a sole focus on future existential risks. (1/4) https://t.co/iEewS5DfAI
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Come checkout our poster for linearizing and clustering data on nonlinear manifolds using an unsup/self-sup approach! The method is simple, fast, and can be trained on a gaming GPU. Yet, it achieves SOTA clustering on CIFAR-10, 20, 100, and even TinyImageNet-200. See you Nord 108
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๐๏ธ As we wrap up summer, construction on Penn Engineering's Amy Gutmann Hall is making incredible progress. Learn more about the building, which compliments the School's IDEAS Signature Initiative, at ๐ https://t.co/XsFhmcrbST ๐ฅ by @earthcam
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