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Deformation and flatness of information geometric structure and their applications

Research Project

Project/Area Number 19K03633
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 12040:Applied mathematics and statistics-related
Research InstitutionUniversity of Fukui

Principal Investigator

Ohara Atsumi  福井大学, 学術研究院工学系部門, 教授 (90221168)

Project Period (FY) 2019-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords情報幾何 / 統計多様体 / 二重自己平行 / 共形平坦化 / ネットワーク非線形拡散 / 二重自己平行性 / 計多様体 / 最適化計算 / 統計モデル
Outline of Research at the Start

確率モデルの変形・一般化に関わる理論は,ロバスト統計・機械学習・統計物理などで急速に必要性を増しつつあるが,(情報)幾何学的な視点からの研究はまだ建設途上であり,大いに不足している.これに取り組むため,応募者は自分たちのこれまでの研究成果も勘案し,次の課題の解決を具体的な研究目的とする.
(A) 非標準的な情報幾何構造の平坦化手法(共形平坦化)の確立とその応用
(B) 双対的な平坦性を合わせもつ(二重自己平行な)確率モデルの特徴づけとその応用

Outline of Final Research Achievements

Since information geometry strucure defines two mutually dual affine connections on manifolds, which are called statistical manifolds, there naturally exist submanifolds which are autoparallel w.r.t. the two connections. Such manifolds are called doubly autoparallel submanifolds. First, we studied and analyzed doubly autoparallel submanifolds within two particularly important statistical manifolds: 1) The probability simplex, which can be identified with the set of discrete probability distributions. 2) The set of positive-definite real symmetric matrices, which can be identified with multivariate normal distributions with a mean of zero. Next, by pursuing the results obtained, we characterized doubly autoparallel submanifolds within a certain class of statistical manifolds known as symmetric cones using the Jordan algebra defined on them. Additionally, for the probability simplex, we provided a classification of these submanifolds.

Academic Significance and Societal Importance of the Research Achievements

多様な状況下での物理的・社会的現象の統計解析の要求から,従来から研究されている確率分布族に属さない非指数型確率モデルに対する統計理論と計算技術の充実が急務となっている.ここに必要な数理は,標準的な情報幾何構造の変形・一般化と密接に関連する.
本研究では,これらの結果に不足する点を埋め深化させるため,平坦性に着目した確率モデルの特徴づけとその構築手法の確立について研究した.ここで得たモデルの平坦性に関する結果は,理論的に新しい概念を提供するでなく,統計推論や最適化に関わる計算アルゴリズムの性能向上や簡略化など実用的に大きな意味をもたらす.

Report

(7 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (7 results)

All 2023 2021 2020 2019

All Journal Article (6 results) (of which Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Doubly autoparallel structure and curvature integrals: Applications to iteration complexity for solving convex programs2023

    • Author(s)
      Atsumi Ohara,Hideyuki Ishi and Takashi Tsuchiya
    • Journal Title

      Information Geometry

      Volume: 7 Issue: S1 Pages: 555-586

    • DOI

      10.1007/s41884-023-00116-x

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Static Output-Feedback Controller Synthesis for Linear MIMO Positive Delay Systems2021

    • Author(s)
      Xiaoyan Zhang and Atsumi Ohara
    • Journal Title

      IEEJ Transactions on Electronics, Information and Systems

      Volume: 141 Pages: 732-739

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Properties of Nonlinear Diffusion Equations on Networks and Their Geometric Aspects2021

    • Author(s)
      Atsumi Ohara and Xiaoyan Zhang
    • Journal Title

      Proceeding of Geometric Sciences 2021 (Frank Nielsen and Frederic Barbaresco eds.) Springer Lecture Notes in Computer Science

      Volume: 12829 Pages: 736-743

    • DOI

      10.1007/978-3-030-80209-7_79

    • ISBN
      9783030802080, 9783030802097
    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] 安定マッチングとそのいくつかの拡張問題の混合整数計画による定化について2021

    • Author(s)
      鈴川 欣秀,小原 敦美
    • Journal Title

      福井大学 学術研究院工学系部門 研究報告

      Volume: 70 Pages: 15-22

    • Related Report
      2021 Research-status Report
    • Open Access
  • [Journal Article] Behaviors of solutions to network diffusion equation with power-nonlinearity A role of the q-exponential function for sufficiently large power-exponent2020

    • Author(s)
      Xiaoyan Zhang, Taiga Senyo, Hiroto Sakai, and Atsumi Ohara
    • Journal Title

      Eur. Phys. J. Special Topics

      Volume: 229 Issue: 5 Pages: 729-741

    • DOI

      10.1140/epjst/e2020-900202-5

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Doubly Autoparallel Structure on Positive Definite Matrices and Its Applications2019

    • Author(s)
      Atsumi Ohara
    • Journal Title

      F. Nielsen and F. Barbaresco (Eds.): GSI 2019, Springer Lec. Notes in Comp. Science

      Volume: 11712 Pages: 251-260

    • DOI

      10.1007/978-3-030-26980-7_26

    • ISBN
      9783030269791, 9783030269807
    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Study for a certain nonlinear diffusion equation on finite networks2019

    • Author(s)
      Atsumi Ohara
    • Organizer
      Erice school of complexity XVI course
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2026-01-16  

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