Publications

Preprints

• Asymptotic Inference for Exchangeable Gibbs Partitions
  Takuya Koriyama, arXiv preprint, 2025.

• Denoising Diffusions with Optimal Transport: Localization, Curvature, and Multi-Scale Complexity
  Tengyuan Liang, Kulunu Dharmakeerthi, and Takuya Koriyama
  arXiv:2411.01629, 2024, submitted.

• Precise Asymptotics of Bagging Regularized M-estimators
  Takuya Koriyama, Pratik Patil, Jin-Hong Du, Kai Tan, and Pierre C. Bellec
  arXiv:2409.15252, 2024, submitted. [github]

• Asymptotics of resampling without replacement in robust and logistic regression
  Pierre C. Bellec and Takuya Koriyama (alphabetical order)
  arXiv:2404.02070, 2024, major revision at Bernoulli.

• Existence of solutions to the nonlinear equations characterizing the precise error of M-estimators
  Pierre C. Bellec and Takuya Koriyama (alphabetical order)
  arXiv:2312.13254, 2023, submitted. [slide]

Publications

• Phase transitions for the existence of unregularized M-estimators in single index models
  Takuya Koriyama and Pierre C. Bellec
  Accepted to Proceedings of the 42nd International Conference on Machine Learning (ICML 2025).

• Asymptotic mixed normality of maximum likelihood estimator for Ewens–Pitman partition
  Takuya Koriyama, Takeru Matsuda and Fumiyasu Komaki
  arXiv:2207.01949, 2022, to appear in Advances in Applied Probability 58.1, 2026. [slide].

• Error estimation and adaptive tuning for unregularized robust M-estimator
  Pierre C. Bellec and Takuya Koriyama (alphabetical order)
  Journal of Machine Learning Research 26 (16), 1-40, 2025.

• Corrected generalized cross-validation for finite ensembles of penalized estimators
  Pierre C. Bellec, Jin-Hong Du, Takuya Koriyama, Pratik Patil and Kai Tan (alphabetical order)
  Journal of the Royal Statistical Society Series B: Statistical Methodology, 87(2), 289-318, 2025. [journal], [slide], [github].

• Fully Data-driven Normalized and Exponentiated Kernel Density Estimator with Hyvärinen Score
  Shunsuke Imai, Takuya Koriyama, Shouto Yonekura, Shonosuke Sugasawa and Yoshihiko Nishiyama
  Journal of Business & Economic Statistics 43 (1), 110-121, 2025. [journal]