# Tomonari Sei

# Profile

Tomonari Sei

**Department of Mathematical Informatics, Graduate School of Information Science and Technology, University of Tokyo Professor**

7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656 Eng. 6 Bldg. Room 353

Tel:

Fax:

E-mail： sei@mist.t.u-tokyo.ac.jp

## Curriculum Vitae

Mar. 2000 | Bachelor degree from Department of Mathematical Engineering and Information Physics, Faculty of Engineering, The University of Tokyo |
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Mar. 2002 | Master degree from Department of Mathematical Engineering and Information Physics, Graduate School of Engineering, The University of Tokyo |

Mar. 2005 | Ph. D. from Department of Mathematical Informatics, Graduate School of Information Science and Technology, The University of Tokyo |

Apr. 2005 | Assistant Professor, Department of Mathematical Informatics, Graduate School of Information Science and Technology, The University of Tokyo |

Apr. 2011 | Lecturer, Department of Mathematics, Faculty of Science and Technology, Keio University |

Apr. 2014 | Associate Professor, Department of Mathematics, Faculty of Science and Technology, Keio University |

Apr. 2015 | Associate Professor, Department of Mathematical Informatics, Graduate School of Information Science and Technology, The University of Tokyo |

Jun. 2021 | Professor, Mathematics and Informatics Center, The University of Tokyo |

## Research Themes

I study theoretical aspects of statistics (mathematical statistics).1. Computational algebraic statistics: application of the holonomic gradient method to statistics.

2. Statistical modeling of rare events and time series data.

3. Statistical methods using optimal transport maps.

## Selected papers

- Sei, T. and Kume, A. (2015). Calculating the normalizing constant of the Bingham distribution on the sphere using the holonomic gradient method, Statistics and Computing, 25 (2), 321-332.
- Sei, T. (2014). Infinitely imbalanced binomial regression and deformed exponential families, Journal of Statistical Planning and Inference, 149, 116-124.
- Rueschendorf, L. and Sei, T. (2012). On optimal stationary couplings between stationary processes, Electronic Journal of Probability, 17 (17), 1-20.
- Nakayama H., Nishiyama K., Noro M., Ohara K., Sei, T., Takayama, N. and Takemura A. (2011). Holonomic gradient descent and its application to the Fisher-Bingham integral, Advances in Applied Mathematics, 47 (3), 639-658.