About me

My name is Lixin Xiu. I’m currently a PhD student at Graduate School of Information Science and Technology, the University of Tokyo, supervised by Prof. Hideki Nakayama. I’m actively finding some research-related internship positions so if you are interested in me, feel free to contact me!

My research interests include Multimodal Large Language Models (MLLMs), post-training, agent systems and information theory.

Education:

The University of Tokyo, Tokyo, Japan (Oct 2024 — Sep 2027, Expected)
PhD in Information Science and Technology. Supervisor: Prof. Hideki Nakayama
The University of Tokyo, Tokyo, Japan (Oct 2022 — Sep 2024)
Master of Information Science and Technology, Department of Mathematical Informatics
Xi’an Jiaotong University, Xi’an, China (Aug 2018 — Jul 2022)
B.E. in Computer Science and Technology

Publications

Lixin Xiu, Xufang Luo, and Hideki Nakayama. A Comprehensive Information-Decomposition Analysis of Large Vision-Language Models. In Proceedings of the 14th International Conference on Learning Representations (ICLR 2026). [Project Page]

Xin Du^*, Lixin Xiu^*, and Kumiko Tanaka-Ishii. Bottleneck-Minimal Indexing for Generative Document Retrieval. In Proceedings of the 41st International Conference on Machine Learning, PMLR 235:11888-11904, 2024. Selected as oral presentations (ICML 2024 Oral).
^*: Equal Contribution.

Experience

Intern (Dec 2025 — Mar 2026)
Shanda AI Research Tokyo, Tokyo, Japan

Research Assistant (Nov 2024 — Present)
Beyond AI, the University of Tokyo and SoftBank, Tokyo, Japan

Traffic Sign Recognition Contest, Summer Workshop 2021 (May 2021 — Jul 2021)
School of Computing, National University of Singapore, Singapore

Honors & Service

Honors:

UTokyo SPRING GX (JPY 180,000/month stipend, JPY 360,000/year research grant), Oct 2024 — Sep 2027
Outstanding Graduate, Xi’an Jiaotong University, Jun 2022
Third Prize of the 12th Mathematics Competition of Chinese College Students, Dec 2020

Service:

Reviewer: ICLR 2026

Misc

You can find my full CV here.