Obuchi Tomoyuki

オブチトモユキ | Obuchi Tomoyuki

Affiliation and department：
Job title： Assistant Professor
Homepage URL (1)： http://www-adsys.sys.i.kyoto-u.ac.jp/obuchi/index.html

Research field (3)： Soft computing , Mathematical physics and basic theory , Statistical science

Research keywords (6)：数理生物 , information theory , quantum dynamics , machine learning , learning theory , statistical physics

Research theme for competitive and other funds (11)：

2022 - 2027 Statistical mechanics approach to high-dimensional machine learning
2022 - 2026 Evolution of data science theory through analysis of solvable models
2019 - 2022 Physics of Glass and Jamming Transitions Captured by Spins: from Soft Matter Physics to Statistical Physics of Information Processing
2018 - 2022 Statistical mechanics and sparse modeling approach to large-scale inverse problems
2017 - 2022 半解析リサンプリング法の開発と整備:信頼性評価への統計力学的アプローチ

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Papers (52)：

Tomoyuki Obuchi, Toshiyuki Tanaka. When resampling/reweighting improves feature learning in imbalanced classification?: A toy-model study. Transactions on Machine Learning Research. 2025
Xiaosi Gu, Tomoyuki Obuchi. Analysis of high-dimensional Gaussian labeled-unlabeled mixture model via message-passing algorithm. Journal of Statistical Mechanics: Theory and Experiment. 2025. 2025. 3. 033404-033404
Koki Okajima, Tomoyuki Obuchi. Transfer Learning in $\ell_1$ Regularized Regression: Hyperparameter Selection Strategy based on Sharp Asymptotic Analysis. Transactions on Machine Learning Research. 2025
Kyoya Uemura, Tomoyuki Obuchi, Toshiyuki Tanaka. Sparse Modeling for Spectrometer Based on Band Measurement. IEEE Transactions on Signal Processing. 2024. 72. 1724-1738
Xiangming Meng, Tomoyuki Obuchi, Yoshiyuki Kabashima. On Model Selection Consistency of Lasso for High-Dimensional Ising Models on Tree-like Graphs. Proceedings of Machine Learning Research. 2023. 206. 6783-6805

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MISC (20)：

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Patents (1)：

Books (3)：

スパースモデリングと情報統計力学
2021
統計力学的手法に基づく階層的ランダム符号の性能解析
2010
Analysis of the Random Energy Model in a Transverse Field- Solvable Quantum Spin Glass
2007

Lectures and oral presentations (132)：

Compound Poisson-Gamma分布を用いたGalton-Watson分枝過程の近似モデリング
(日本物理学会第80回年次大会(2025年) 2025)
Analysis of High-dimensional Gaussian Labeled-unlabeled Mixture Model via Message-passing Algorithm
(2025)
Neural Collapse in Cumulative Link Models for Ordinal Regression: An Analysis with Unconstrained Feature Model
(2025)
L1正則化回帰における転移学習の典型的解析及びハイパーパラメータ選択法の提案
(2025)
1段階レプリカ対称性の破れを利用した非凸性アニーリング
(日本物理学会2025年春季大会 2025)

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Education (4)：

2007 - 2010 Tokyo Institute of Technology Graduate School of Science and Engineering
2010 - 東京工業大学博士(理学)
2005 - 2007 Tokyo Institute of Technology Graduate School of Science and Engineering
2001 - 2005 Tokyo Institute of Technology School of Science

Professional career (1)：

Work history (7)：

2019/12 - 現在 Kyoto University Graduate School of Informatics, Department of Systems Science Associate professor
2016/04 - 2019/11 Tokyo Institute of Technology School of Computing Assistant Professor
2013/10 - 2016/03 Tokyo Institute of Technology Interdisciplinary Graduate School of Science and Engineering Assistant Professor
2012/09 - 2013/09 Ecole Normale Superieure Paris Department of theoretical physics Postdoctoral researcher
2012/04 - 2013/09 Osaka University Cybermedia Center

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Committee career (2)：

Association Membership(s) (2)：

日本統計学会 , 日本物理学会

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