Researchers Information System

日本語に切り替えるswitch to english

Obuchi, Tomoyuki

Graduate School of Informatics, Department of Systems Science Associate Professor

Obuchi, Tomoyuki
list
    Last Updated :2022/07/03

    Basic Information

    Faculty

    • 工学部

    Academic Degree

    • 修士(理学)(東京工業大学)
    • 博士(理学)(東京工業大学)

    Research History

    • From Dec. 2019, To Present
      Kyoto University, Graduate School of Informatics Department of Systems Science, Associate professor
    • From Apr. 2016, To Nov. 2019
      Tokyo Institute of Technology, School of Computing, Assistant Professor
    • From Oct. 2013, To Mar. 2016
      Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, Assistant Professor
    • From Sep. 2012, To Sep. 2013
      Ecole Normale Superieure Paris, Department of theoretical physics, Postdoctoral researcher
    • From Apr. 2012, To Sep. 2013
      Osaka University, Cybermedia Center, 日本学術振興会特別研究員PD
    • From Apr. 2010, To Mar. 2012
      Osaka University, Graduate School of Science Department of Earth and Space Science, 特任研究員
    • From Apr. 2008, To Mar. 2010
      Tokyo Institute of Technology, Graduate School of Science and Engineering, 日本学術振興会特別研究員DC2

    ID,URL

    researchmap URL

    list
      Last Updated :2022/07/03

      Research

      Research Interests

      • 数理生物
      • information theory
      • quantum dynamics
      • machine learning
      • learning theory
      • statistical physics

      Research Areas

      • Informatics, Soft computing
      • Natural sciences, Mathematical physics and basic theory
      • Informatics, Statistical science

      Papers

      • 22pBT-11 Statistical mechanical analysis on flocks model in which interactions are defined on sparse graph
        Hikita S.; Obuchi T.; Kabashima Y.
        Meeting Abstracts of the Physical Society of Japan, 2016
      • 22pBT-10 Semi-analytic cross validation method for LASSO
        Obuchi T.; Kabashima Y.
        Meeting Abstracts of the Physical Society of Japan, 2016
      • 19aCQ-5 Distribution of sparse solutions in indeterminate linear equations
        Obuchi T.; Kabashima Y.
        Meeting Abstracts of the Physical Society of Japan, 2015
      • Assessing transfer entropy from biochemical data
        Takuya Imaizumi; Nobuhisa Umeki; Ryo Yoshizawa; Tomoyuki Obuchi; Yasushi Sako; Yoshiyuki Kabashima
        Physical Review E, 08 Mar. 2022
      • Ising Model Selection Using $\ell_1$-Regularized Linear Regression: A Statistical Mechanics Analysis
        Xiangming Meng; Tomoyuki Obuchi; Yoshiyuki Kabashima
        Advances in Neural Information Processing Systems, Aug. 2021
      • Perfect reconstruction of sparse signals with piecewise continuous nonconvex penalties and nonconvexity control
        Ayaka Sakata; Tomoyuki Obuchi
        Journal of Statistical Mechanics: Theory and Experiment, 01 Sep. 2021, Last author
      • Sharp Asymptotics of Matrix Sketching for a Rank-One Spiked Model
        Fumito Tagashira; Tomoyuki Obuchi; Toshiyuki Tanaka
        2021 IEEE International Symposium on Information Theory (ISIT), 12 Jul. 2021
      • Structure learning in inverse Ising problems using ℓ 2-regularized linear estimator
        Xiangming Meng; Tomoyuki Obuchi; Yoshiyuki Kabashima
        Journal of Statistical Mechanics: Theory and Experiment, 01 May 2021
      • Reconstructing Sparse Signals via Greedy Monte-Carlo Search
        Kao Hayashi; Tomoyuki Obuchi; Yoshiyuki Kabashima
        Journal of the Physical Society of Japan, 15 Dec. 2020, Corresponding author
      • Inferring Neuronal Couplings From Spiking Data Using a Systematic Procedure With a Statistical Criterion
        Yu Terada; Tomoyuki Obuchi; Takuya Isomura; Yoshiyuki Kabashima
        Neural Computation, Nov. 2020
      • Learning performance in inverse Ising problems with sparse teacher couplings
        Alia Abbara; Yoshiyuki Kabashima; Tomoyuki Obuchi; Yingying Xu
        Journal of Statistical Mechanics: Theory and Experiment, 06 Jul. 2020, Peer-reviewed
      • Empirical Bayes method for Boltzmann machines
        Muneki Yasuda; Tomoyuki Obuchi
        Journal of Physics A: Mathematical and Theoretical, 10 Jan. 2020
      • Cross validation in sparse linear regression with piecewise continuous nonconvex penalties and its acceleration
        Tomoyuki Obuchi; Ayaka Sakata
        Journal of Physics A: Mathematical and Theoretical, 11 Oct. 2019
      • Semi-Analytic Resampling in Lasso
        Tomoyuki Obuchi; Yoshiyuki Kabashima
        Journal of Machine Learning Research, Apr. 2019, Peer-reviewed
      • Statistical mechanical analysis of sparse linear regression as a variable selection problem
        Tomoyuki Obuchi; Yoshinori Nakanishi-Ohno; Masato Okada; Yoshiyuki Kabashima
        Journal of Statistical Mechanics: Theory and Experiment, Oct. 2018, Peer-reviewed
      • Mean-field theory of graph neural networks in graph partitioning
        Tatsuro Kawamoto; Masashi Tsubaki; Tomoyuki Obuchi
        Advances in Neural Information Processing Systems 31, Sep. 2018, Peer-reviewed
      • Objective and efficient inference for couplings in neuronal networks
        Yu Terada; Tomoyuki Obuchi; Takuya Isomura; Yoshiyuki Kabashima
        Advances in Neural Information Processing Systems 31, Sep. 2018, Peer-reviewed
      • Accelerating Cross-Validation in Multinomial Logistic Regression with L1-Regularization
        Tomoyuki Obuchi; YOSHIYUKI KABASHIMA
        Journal of Machine Learning Research, Sep. 2018, Peer-reviewed
      • Accelerating cross-validation with total variation and its application to super-resolution imaging
        Tomoyuki Obuchi; Shiro Ikeda; Kazunori Akiyama; Yoshiyuki Kabashima
        PLoS ONE, Dec. 2017, Peer-reviewed
      • Complex semiclassical analysis of the Loschmidt amplitude and dynamical quantum phase transitions
        Tomoyuki Obuchi; Sei Suzuki; Kazutaka Takahashi
        PHYSICAL REVIEW B, May 2017, Peer-reviewed
      • Random versus maximum entropy models of neural population activity
        Ulisse Ferrari; Tomoyuki Obuchi; Thierry Mora
        PHYSICAL REVIEW E, Apr. 2017, Peer-reviewed
      • Sampling approach to sparse approximation problem: Determining degrees of freedom by simulated annealing
        Tomoyuki Obuchi; Yoshiyuki Kabashima
        European Signal Processing Conference, 28 Nov. 2016, Peer-reviewed
      • Relative species abundance of replicator dynamics with sparse interactions
        Tomoyuki Obuchi; Yoshiyuki Kabashima; Kei Tokita
        JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT, Nov. 2016, Peer-reviewed
      • Boltzmann-machine learning of prior distributions of binarized natural images
        Tomoyuki Obuchi; Hirokazu Koma; Muneki Yasuda
        Journal of the Physical Society of Japan (JPSJ), Oct. 2016, Peer-reviewed
      • Multiple peaks of species abundance distributions induced by sparse interactions
        Tomoyuki Obuchi; Yoshiyuki Kabashima; Kei Tokita
        PHYSICAL REVIEW E, Aug. 2016, Peer-reviewed
      • Sparse approximation based on a random overcomplete basis
        Yoshinori Nakanishi-Ohno; Tomoyuki Obuchi; Masato Okada; Yoshiyuki Kabashima
        JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT, Jun. 2016, Peer-reviewed
      • Cross validation in LASSO and its acceleration
        Tomoyuki Obuchi; Yoshiyuki Kabashima
        JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT, May 2016, Peer-reviewed
      • Monte Carlo Approach to sparse approximation problem
        Obuchi Tomoyuki; Kabashima Yoshiyuki
        Meeting Abstracts of the Physical Society of Japan, 2016
      • Sparse linear regression for transmission coefficient based on LASSO
        Obuchi Tomoyuki; Kabashima Yoshiyuki; Ando Yasunobu; Fujikake So; Watanabe Satoshi
        Meeting Abstracts of the Physical Society of Japan, 2016
      • Cross validation in Monte Carlo method for sparse approximation problem
        Obuchi Tomoyuki; Kabashima Yoshiyuki
        Meeting Abstracts of the Physical Society of Japan, 2016
      • Sparse approximation problem: how rapid simulated annealing succeeds and fails
        Tomoyuki Obuchi; Yoshiyuki Kabashima
        INTERNATIONAL MEETING ON HIGH-DIMENSIONAL DATA-DRIVEN SCIENCE (HD3-2015), 2016, Peer-reviewed
      • Sampling approach to sparse approximation problem: determining degrees of freedom by simulated annealing
        Tomoyuki Obuchi; Yoshiyuki Kabashima
        2016 24TH EUROPEAN SIGNAL PROCESSING CONFERENCE (EUSIPCO), 2016, Peer-reviewed
      • Approximate cross-validation formula for Bayesian linear regression
        Yoshiyuki Kabashima; Tomoyuki Obuchi; Makoto Uemura
        2016 54TH ANNUAL ALLERTON CONFERENCE ON COMMUNICATION, CONTROL, AND COMPUTING (ALLERTON), 2016, Peer-reviewed
      • Learning probabilities from random observables in high dimensions: the maximum entropy distribution and others
        Tomoyuki Obuchi; Simona Cocco; Rémi Monasson
        Journal of Statistical Physics, Aug. 2015, Peer-reviewed
      • Learning probability distributions from smooth observables and the maximum entropy principle: some remarks
        Tomoyuki Obuchi; Remi Monasson
        STATPHYS-KOLKATA VIII, 2015, Peer-reviewed
      • Monte Carlo simulations of the three-dimensional XY spin glass focusing on chiral and spin order
        Tomoyuki Obuchi; Hikaru Kawamura
        Physical Review B - Condensed Matter and Materials Physics, 31 May 2013, Peer-reviewed
      • Zeros of the partition function and dynamical singularities in spin-glass systems
        K. Takahashi; T. Obuchi
        ELC INTERNATIONAL MEETING ON INFERENCE, COMPUTATION, AND SPIN GLASSES (ICSG2013), 2013, Peer-reviewed
      • Dynamical singularities of glassy systems in a quantum quench
        Tomoyuki Obuchi; Kazutaka Takahashi
        PHYSICAL REVIEW E, Nov. 2012, Peer-reviewed
      • Spin and chiral orderings of the antiferromagnetic XY model on the triangular lattice and their critical properties
        Tomoyuki Obuchi; Hikaru Kawamura
        Journal of the Physical Society of Japan, Apr. 2012, Peer-reviewed
      • Partition-function zeros of spherical spin glasses and their relevance to chaos
        Tomoyuki Obuchi; Kazutaka Takahashi
        JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL, Mar. 2012, Peer-reviewed
      • Statistical mechanical analysis of a hierarchical random code ensemble in signal processing
        Tomoyuki Obuchi; Kazutaka Takahashi; Koujin Takeda
        JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL, Feb. 2011, Peer-reviewed
      • Replica symmetry breaking, complexity, and spin representation in the generalized random energy model
        Tomoyuki Obuchi; Kazutaka Takahashi; Koujin Takeda
        Journal of Physics A: Mathematical and Theoretical, Nov. 2010, Peer-reviewed
      • Zero-temperature complex replica zeros of the ±J Ising spin glass on mean-field systems and beyond
        Tomoyuki Obuchi; Yoshiyuki Kabashima; Hidetoshi Nishimori; Masayuki Ohzeki
        Physica E, Aug. 2010, Peer-reviewed
      • Role of the finite replica analysis in the mean-field theory of spin glasses
        Tomoyuki Obuchi
        Mar. 2010, Peer-reviewed
      • Distribution of partition function zeros of the ± J model on the Bethe lattice
        Yoshiki Matsuda; Markus Müller; Hidetoshi Nishimori; Tomoyuki Obuchi; Antonello Scardicchio
        Journal of Physics A: Mathematical and Theoretical, 2010, Peer-reviewed
      • Weight space structure and analysis using a finite replica number in the Ising perceptron
        Tomoyuki Obuchi; Yoshiyuki Kabashima
        JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT, Dec. 2009, Peer-reviewed
      • Complex replica zeros of +/- J Ising spin glass at zero temperature
        Tomoyuki Obuchi; Yoshiyuki Kabashima; Hidetoshi Nishimori
        JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL, Feb. 2009, Peer-reviewed
      • Phase diagram of the p-spin-interacting spin glass with ferromagnetic bias and a transverse field in the infinite-p limit
        Tomoyuki Obuchi; Hidetoshi Nishimori; David Sherrington
        JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, May 2007, Peer-reviewed

      Misc.

      • 25pTD-5 Performance of a hierarchical random code and the replica symmetry breaking
        Obuchi Tomoyuki; Takeda Koujin; Takahashi Kazutaka
        Meeting abstracts of the Physical Society of Japan, 18 Aug. 2010
      • 23pTH-2 Replica symmetry breaking and complexity in hierarchical random energy model
        Takahashi Kazutaka; Obuchi Tomoyuki; Takeda Koujin
        Meeting abstracts of the Physical Society of Japan, 18 Aug. 2010
      • 25aQL-4 Finite Replica Analysis of Simple Perceptron and Complexity
        Obuchi Tomoyuki; Kabashima Yoshiyuki
        Meeting abstracts of the Physical Society of Japan, 18 Aug. 2009
      • 22aTJ-2 Zeros of nth moment of the distribution function on complex replica plane
        Obuchi Tomoyuki; Nishimori Hidetoshi
        Meeting abstracts of the Physical Society of Japan, 21 Aug. 2007
      • 23aXD-4 Phase diagram of the random energy model in a transverse field
        Obuchi Tomoyuki; Nishimori Hidetoshi
        Meeting abstracts of the Physical Society of Japan, 18 Aug. 2006
      • 27aTJ-4 Lee-Yang zeros of the ±J model of spin glasses on the Bethe lattice
        Matsuda Y.; Nishimori H.; Obuchi T.; Scardicchio Antonello
        Meeting abstracts of the Physical Society of Japan, 03 Mar. 2009
      • 18pWA-10 Phase diagram of the SK model in a transverse field at zero temperature
        Obuchi Tomoyuki; Nishimori Hidetoshi
        Meeting abstracts of the Physical Society of Japan, 28 Feb. 2007
      • Relative species abundance of replicator dynamics with sparse interactions
        Tokita Kei; Kabashima Yoshiyuki; Obuchi Tomoyuki
        Journal of Statistical Mechanics: Theory and Experiment, 16 Nov. 2016
      • International Meeting on "high-Dimensional Data-Driven Science" (HD3-2017)
        Masayuki Ohzeki; Teppei Ikeya; Tatsu Kuwatani; Yoshinori Nakanishi-Ohno; Masamichi J. Miyama; Tomoyuki Obuchi
        Journal of Physics: Conference Series, 27 Jun. 2018
      • 過完備基底による歪有圧縮のレート歪関係
        中西(大野)義典; 中西(大野)義典; 小渕智之; 岡田真人; 樺島祥介
        日本物理学会講演概要集(CD-ROM), 24 Mar. 2015
      • 過完備基底圧縮の統計力学的解析
        中西(大野)義典; 小渕智之; 岡田真人; 樺島祥介
        情報理論とその応用シンポジウム予稿集(CD-ROM), 02 Dec. 2014
      • 過完備基底を用いた歪有圧縮の統計力学的解析
        中西(大野)義典; 小渕智之; 岡田真人; 樺島祥介
        電子情報通信学会技術研究報告, 10 Nov. 2014
      • 7pAR-9 Performance evaluation of overcomplete basis compression by the replica method
        Nakanishi-Ohno Yoshinori; Obuchi Tomoyuki; Okada Masato; Kabashima Yoshiyuki
        Meeting abstracts of the Physical Society of Japan, 22 Aug. 2014
      • 19aAD-9 Replicator equations with (p+r)-body species interactions
        Oura Takeshi; Obuchi Tomoyuki; Tokita Kei
        Meeting abstracts of the Physical Society of Japan, 24 Aug. 2012
      • 25pAG-9 Equilibrium Monte-Carlo Approch to Ordering of Three-Dimensional XY Spin Glasses
        Obuchi Tomoyuki; Kawamura Hikaru
        Meeting abstracts of the Physical Society of Japan, 05 Mar. 2012
      • 20aVC-10 Relation between complex replica zeros and some kinds of phase transitions
        Obuchi Tomoyuki; Nishimori Hidetoshi; Kabashima Yoshiyuki
        Meeting abstracts of the Physical Society of Japan, 25 Aug. 2008
      • 26pWF-8 Zeros of the replicated partition function on the complex replica plane : in the presence of the RSB
        Obuchi Tomoyuki; Nishimori Hidetoshi; Kabashima Yoshiyuki
        Meeting abstracts of the Physical Society of Japan, 29 Feb. 2008

      External funds: Kakenhi

      • Physics of Glass and Jamming Transitions Captured by Spins: from Soft Matter Physics to Statistical Physics of Information Processing
        Grant-in-Aid for Scientific Research (B)
        Basic Section 13010:Mathematical physics and fundamental theory of condensed matter physics-related
        Osaka University
        吉野 元
        From 01 Apr. 2019, To 31 Mar. 2022, Granted
        ガラス転移;ジャミング転移;フラストレートスピン系;ソフトマター;情報統計力学;フラストレート磁性;スピングラス;深層ニューラルネットワーク;機械学習;統計的推定
      • Statistical mechanics and sparse modeling approach to large-scale inverse problems
        Grant-in-Aid for Scientific Research (C)
        Basic Section 61040:Soft computing-related
        Kyoto University;Tokyo Institute of Technology
        小渕 智之
        From 01 Apr. 2018, To 31 Mar. 2022, Granted
        情報統計力学;スパースモデリング;統計的逆問題;機械学習
      • 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
        Grant-in-Aid for Scientific Research (A)
        The University of Tokyo;Tokyo Institute of Technology
        樺島 祥介
        From 01 Apr. 2017, To 31 Mar. 2022, Granted
        リサンプリング;交差検証法;ブートストラップ;レプリカ法;平均場近似;ブートストラップ法;確率伝搬法;期待値伝搬法;ランダム行列
      • A comprehensive study of learning, inference, and inverse problems based on the spin-glass theory
        Grant-in-Aid for Young Scientists (B)
        Tokyo Institute of Technology
        Tomoyuki Obuchi
        From 01 Apr. 2014, To 31 Mar. 2017, Project Closed
        逆問題・多自由度推定;統計的学習理論・機械学習;統計物理学;最大エントロピー法;スパースモデリング;逆問題;機械学習;ニューラルネットワーク;ベイズ統計
      • Statistical mechanics approach to massive sparse modeling
        Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
        Complex systems
        Tokyo Institute of Technology
        Yoshiyuki KABASHIMA
        From 28 Jun. 2013, To 31 Mar. 2018, Project Closed
        圧縮センシング;潜在変数モデリング;モデル選択;レプリカ法;平均場近似;特異モデル;統計力学;情報量基準;交差検証法;行列分解
      • スピングラス理論に基づいた逆問題の統計力学的研究
        Grant-in-Aid for Young Scientists (B)
        Osaka University
        小渕 智之
        From 01 Apr. 2012, To 31 Mar. 2013, Declined
      • 可解モデルの解析を通じたデータ科学の理論の進化
        Grant-in-Aid for Scientific Research (C)
        Basic Section 61040:Soft computing-related
        Kyoto University
        小渕 智之
        From 01 Apr. 2022, To 31 Mar. 2026, Adopted
      list
        Last Updated :2022/07/03

        Education

        Teaching subject(s)

        • From 01 Apr. 2022, To 31 Mar. 2023
          Systems Science, Advanced II
          3512, Fall, Graduate School of Informatics, 2
        • From 01 Apr. 2022, To 31 Mar. 2023
          Information-theoretic systems thory
          3555, Spring, Graduate School of Informatics, 2
        • From 01 Apr. 2022, To 31 Mar. 2023
          Mathematical theory of information and communications
          9142, Fall, Faculty of Engineering, 2
        • From 01 Apr. 2022, To 31 Mar. 2023
          Systems Science, Advanced I
          3542, Spring, Graduate School of Informatics, 2
        • From Apr. 2020, To Mar. 2021
          Mathematical theory of information and communications
          Fall, 工学部
        • From Apr. 2020, To Mar. 2021
          Introduction to Systems Analysis
          Fall, 工学部
        • From Apr. 2020, To Mar. 2021
          Adaptive Systems Theory
          Spring, 情報学研究科
        • From Apr. 2021, To Mar. 2022
          ILAS Seminar :Starting statistical mechanics from scratch
          Spring, 全学共通科目
        • From Apr. 2021, To Mar. 2022
          Mathematical theory of information and communications
          Fall, 工学部
        • From Apr. 2021, To Mar. 2022
          Systems Science, Advanced II
          Fall, 情報学研究科
        • From Apr. 2021, To Mar. 2022
          Systems Science, Advanced I
          Spring, 情報学研究科
        • From Apr. 2021, To Mar. 2022
          Introduction to Systems Analysis
          Fall, 工学部
        • From Apr. 2021, To Mar. 2022
          Adaptive Systems Theory
          Spring, 情報学研究科
        list
          Last Updated :2022/07/03

          Administration

          Faculty management (title, position)

          • From 01 Apr. 2020, To 31 Mar. 2022
            評価WG
          list
            Last Updated :2022/07/03

            Academic, Social Contribution

            Committee Memberships

            • From Oct. 2017, To Sep. 2018
              領域11運営委員, 日本物理学会

            ページ上部へ戻る