Romain Chor, Ph.D.

Ph.D. in Statistical Learning

Based in Paris, France

I am currently a Machine learning researcher in the INSERM unit MASCOT at Hôpital Lariboisière (AP-HP, Paris). I joined the INDICATE consortium (indicate-europe.eu) -- a collaboration between hospitals, universities, research institutes all across the EU -- developing a Federated Learning infrastructure to tackle challenges faced by Intensive Care Units (ICUs) that hinder progress in data-driven clinical decision-making and innovations. In particular, my work will focus on the development and implementation of Federated Learning methods for the early detection of organ failure.

I succesfully defended my Ph.D. thesis on September 2025.

My thesis, titled "Distributed and Federated Learning Systems: Information-Theoretic Generalization Bounds and Algorithms", was prepared at Huawei Paris Research Center and Laboratoire d'Informatique Gaspard Monge (LIGM, Université Gustave Eiffel).
The Ph.D. work focused on the generalization performance of distributed learning algorithms (in particular Federated Learning), in particular via information-theoretic tools, and on the development generalization-aware algorithms.

Feel free to visit my GitHub repository dedicated to Data Science, containing several of some recent and undergraduate projects: Link.

Research

Papers & Preprints

Google Scholar profile

Heterogeneity Matters even More in Distributed Learning: Study from Generalization Perspective
M. Kavian, R. Chor, M. Sefidgaran and A. Zaidi. International Symposium on Information Theory (ISIT) 2026, Mar. 2026. Link.
On the Effect of Client-Server Communication on the Generalization Error of Federated Learning.
R. Chor, A. Zaidi and M. Sefidgaran. IEEE Transactions on Information Theory, Mar. 2026. Link.
Lessons from Generalization Error Analysis of Federated Learning: You May Communicate Less Often!
M. Sefidgaran, R. Chor, A. Zaidi and Y. Wan. Forty-first International Conference on Machine Learning (ICML), 2024. Link.
More Communication Does Not Result in Smaller Generalization Error in Federated Learning.
R. Chor, M. Sefidgaran and A. Zaidi. International Symposium on Information Theory (ISIT), 2023. Link.
Rate-Distortion Theoretic Bounds on Generalization Error for Distributed Learning.
M. Sefidgaran, R. Chor and A. Zaidi. Neural Information Processing Systems 35 (NeurIPS), 2022. Link.

Other research activities

I am currently preparing a monograph paper on the topic of distributed learning algorithms & their generalization analysis, with several co-authors.
The paper will be available end of 2025.
I have had the opportunity to serve as a reviewer for the following conferences and journals:
NeurIPS 2024, AIStats 2025, ICML 2025, ECAI 2025, ISIT 2025, IEEE Transactions on Information Theory, ...

Teaching activities

Probability theory (~26h)
Fall 2024. École supérieure d’ingénieurs en électrotechnique et électronique (ESIEE Paris)
Statistics (~16h)
Fall 2023 and Fall 2024. École supérieure d’ingénieurs en électrotechnique et électronique (ESIEE Paris).
Coding theory (~26h)
Fall 2023. École supérieure d’ingénieurs en électrotechnique et électronique (ESIEE Paris).

CV (in short)

Ph.D. student in Statistical Learning
2022 - Sept. 2025. Huawei Paris Research Center (Huawei Technologies France) and Laboratoire d'Informatique Gaspard Monge (Université Gustave Eiffel).
Research engineer in Statistical Learning
Nov.-Dec. 2019. Laboratoire d'Informatique Gaspard Monge (Université Gustave Eiffel).
Data Scientist Intern
2020. Safety Line, Paris.
M.Sc. in Statistics.
2019 - 2020. Sorbonne Université, Paris.

Conferences, Workshops, Seminars

Oral presentation of a published paper
@ISIT 2023, Taipei (Taiwan)

France Information Theory PhD Workshop, June 2024. Palaiseau, France.
Oral presentation of my PhD work and some recent results at Telecom Paris. Link
International Symposium on Information Theory (ISIT), July 2023. Taipei, Taiwan.
Oral presentation of published paper "More Communication Does Not Result in Smaller Generalization Error in Federated Learning".
London Symposium on Information Theory, 2023. May 2023. London, United Kingdom.
Poster presentation.
"NeurIPS in Paris". December 2022. Paris, France.
Poster presentation of published paper at NeurIPS 2022 conference "Rate-Distortion Theoretic Bounds on Generalization Error for Distributed Learning".

To contact me

romain.chor@yahoo.fr

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