# Welcome to Fanghui Liu (刘方辉)'s Homepage!

# Fanghui Liu

### Assistant Professor at Department of Computer Science, University of Warwick, UK

Email: **x**@**y** with **x**=fanghui.liu and **y**=warwick.ac.uk

Member of Centre for Discrete Mathematics and its Applications (DIMAP), Warwick

Affiliated member of the Division of Theory and Foundations (FoCS)

Visiting research scientist at EPFL, Switzerland

Email: **x**@**y** with **x**=fanghui.liu and **y**=epfl.ch

at Zermatt, Switzerland (Aug. 2022)

## About me

I'm currently an assistant professor at Department of Computer Science, a member of Centre for Discrete Mathematics and its Applications (DIMAP), an affliated member of the Division of Theory and Foundations (FoCS), at the University of Warwick, UK. Besides, I'm also a visiting research scientist at at EPFL, Switzerland. I am an ELLIS Member.

Previously, I was a postdoc researcher in the Laboratory for Information and Inference Systems (LIONS), École Polytechnique Fédérale de Lausanne (EPFL), Switzerland, working with Prof. Volkan Cevher from 2021 to 2023. Before that, I spent two years as a postdoc researcher in Department of Electrical Engineering (ESAT-STADIUS), KU Leuven, Belgium, hosted by Prof. Johan A.K. Suykens.

I obtained the Ph.D degree from Institute of Image Processing Pattern Recognition in Department of Automation, Shanghai Jiao Tong University (SJTU) in June 2019, supervised by Prof. Jie Yang, and the B.E. degree in Automation, Harbin Institute of Technology (HIT) in 2014.

## Jobs

**I am looking for highly motivated Ph.D. students to work with me on machine learning theory or theoretical-oriented application topics.** See Open positions for details.

Due to a large number of requests, I, unfortunately, may not be able to reply to all the emails regarding PhD applications. However, I'll look at applicants that have sent me emails and contact you soon if your enquires are indeed inline with my research.

## Research Interests

I'm generally interested in **mathematical foundations of machine learning**,
e.g., **statistical learning theory** and deep learning theory on the generalization properties of under-/over-parameterized models.
Currently I'm also interested in reinforcement learning theory, especially on function approximation, from classical statistical learning to sequential decision making.

My research interest starts from kernel methods to large-scale computational methodologies in algorithm, and mainly focuses on theoretically understanding generalization properties of machine learning based algorithms, especially on **over-parameterized models** (motivated by neural networks).
In fact, my research line can be understood from a **function space theory** perspective, from RKHS to hyper-RKHS, Barron spaces, Besov spaces.
This aims to understand the role of over-parameterization from kernel methods to neural networks.

Refer to my **Research Statement** if you're interested in.

statistical learning theory, e.g., double descent, benign overfitting [AISTATS21, NeurPS22, ICML23], theory of kernel methods [JMLR21, ML21].

Besides, I also spend time on student projects in theoretical-oriented application topics,
e.g., robustness and verification [NeurIPS22, NeurIPS22], neural architecture search [NeurIPS22], and out-of-distribution generalization [NeurIPS22], which aims to build **trustworthy machine learning** systems.

## News

[2024-01] Three papers were accepted by ICLR 2024: generalization of ResNets; robust NAS from benchmark to theory; local-linearity for catastrophic overfitting.

**I will be at Vienna. Feel free to chat.**

[2023-12] Selected to give a talk at AAAI 2024 New Faculty Highlights.

[2023-10] Join in University of Warwick as an assistant professor.

[2023-09] Two papers were accepted by NeurIPS 2023: one is about global convergence of Transformers; the other one is how over-parameterization affects differential privacy.

**I will be at New Orleans (again and again). Feel free to chat.**

[2023-06] Here is the slides of our CVPR 2023 tutorial.

[2023-06] Here is the slides of our ICASSP 2023 tutorial.

[2023-04] Two papers were accepted by ICML 2023: one is about function approximation in online RL; the other one is related to benign overfitting.

**I will be at Hawaii! Feel free to chat.**

[2023-04] Selected as a Notable Reviewer for ICLR 2023.

[2023-02] We will give a tutorial entitled

**Deep learning theory for computer vision**at IEEE CVPR 2023 in Vancouver, Canada.

[2023-02] I will attend the Rising Stars in AI Symposium 2023 at KAUST in Saudi Arabia (Feb. 19-21).

[2022-12] We will give a tutorial entitled

**Neural networks: the good, the bad, the ugly**at IEEE ICASSP 2023 in the Greek island of Rhodes.

[2022-09] Six papers were accepted by NeurIPS 2022.

[2021-10] One paper on double descent of RFF with SGD was posted on arXiv.

[2021-10] One paper was accepted by IEEE Transactions on Pattern Analysis and Machine Intelligence.

[2021-07] One paper was accepted by IEEE Transactions on Pattern Analysis and Machine Intelligence.

[2021-06] One paper was accepted by Journal of Machine Learning Research.

[2021-02] One paper was accepted by Machine Learning.

[2021-01] Two papers were accepted by AISTATS 2021.

[2020-10] One paper was accepted by Journal of Machine Learning Research.