Geometric Aspects of Mathematical Optimization and Statistical Theories

Information

Date:	December 16--17, 2025 (Japan Standard Time)
Venue:	Academic Extension Center (Osaka Metropolitan University)
Contents:	Workshop (Hybrid: physical/virtual)

This workshop is held as a part of OCAMI Joint Usage/Research
Please register if you would like to participate: Registration (Google Form)

Program

• December 16 (Tuesday)

13:00--13:50	Atsumi Ohara (Otemon Gakuin University)
	Conformal Flattening on the Probability Simplex and Its Applications
14:00--14:50	Naomichi Nakajima (Shibaura Institute of Technology)
	Information geometry of multiple roots in maximum likelihood estimation and singularity theory
15:00--15:50	Kaori Yamaguchi (Ritsumeikan University)
	Characterization of δ-almost sufficient statistics via KL divergence
16:10--17:00	Akifumi Okuno (Institute of Statistical Mathematics)
	Algebraic Approach to Ridge-Regularized Mean Squared Error Minimization in Minimal ReLU Neural Network
17:10--18:00	Bruno F. Lorenço^* (Institute of Statistical Mathematics)
	Some recent results on the geometry of hyperbolicity cones

• December 17 (Wednesday)

10:00--10:50	Takaharu Yaguchi (Kobe University)
	Symplectic Methods for Learning Hamiltonian Systems
11:00--11:50	Masaki Yoshioka (The University of Osaka)
	Geometric bias correction of maximum likelihood estimators in one-sided truncated exponential families
13:30--14:20	Michiko Okudo (Chiba University)
	Bayesian shrinkage prediction and estimation based on geometric structure
14:30--14:20	Hisatoshi Tanaka (Waseda University)
	The second score equation and semiparametric efficiency in regression models
15:40--16:30	Bartosz Kołodziejek (Warsaw University of Technology)
	A new class of colored Gaussian graphical models with explicit normalizing constants
16:40--17:30	Piotr Zwiernik^* (Pompeu Fabra University)
	Probabilistic PCA on tensors

*: Online Talk

Organizers

Hideto Nakashima (Tokai University)
Koichi Tojo (Tokai University)
Hiroto Inoue (Nishinippon Institute of Technology)
Yoshihiko Konno (Osaka Metropolitan University)
Hideyuki Ishi (Osaka Metropolitan University)
Kenji Fukumizu (The Institute of Statistical Mathematics)

Contact: h-nakashima [at] tokai.ac.jp

Sponsor

This workshop is supported by the following institution and grant:

OCAMI (Osaka Central Advanced Mathematical Institute)
- "MEXT Promotion of Distinctive Joint Research Center Program JPMXP0723833165"
- "Osaka Metropolitan University Strategic Research Promotion Project: Development of International Research Hubs"
JSPS KAKENHI Grant Numbers JP24KK0059 (Fund for the Promotion of Joint International Research)

Last modified: November 20, 2025