July 8, 2021
The recipients of the 3rd Hosoya Prize
1. Masaaki Imaizumi（University of Tokyo）
Imaizumi, M. and Fukumizu, K. (2019). Deep Neural Networks Learn Non-Smooth Functions Effectively. Artificial Intelligence and Statistics (PMLR 89).
2. Kaiji Motegi（Kobe University）
Hamori, S., Motegi, K. and Zhang, Z. (2020). Copula-based regression models with
data missing at random. Journal of Multivariate Analysis, 180.
Review comments
The two papers by Dr. Masaaki Imaizumi and Dr. Kaiji Motegi have established critical contributions in theory and application of statistics/data science, and we suggest both two for the 3rd Hosoya prize recipients.
Dr. Masaaki Imaizumi clarifies advantageous features of deep neural networks (DNNs) for non-smooth functions in a theoretical way. It has been empirically known that DNNs often outperform other methods, while theoretical justification is rarely known. This paper tackles this challenging problem by deriving the minimax rate for the least square and Bayes estimators of piecewise smooth functions. The great contributions are judged to be suitable for the prize.
Dr. Kaiji Motegi examines copula-based regression models when there is random missing of data. Analysis of missing data has been one of the complicated and challenging problem in statistics. This paper provides a practically working method to missing data problems with interesting empirical examples. His contributions to tackle the difficult problem deserves the prize.
Hosoya prize selection committee
Nobuhiko Terui (chair, Tohoku Univ.)
Kosuke Oya (Osaka Univ.)
Mototsugu Shintani (Univ. Tokyo)
Yasumasa Matsuda (Tohoku Univ.)
Peter M. Robinson (London School of Economics and Political Science)
Takashi Yamagata (Univ. York and Osaka Univ.)
Brief history of Dr. Masaaki Imaizumi
BA in literature, Univ. of Tokyo in 2011
PhD in Economics, Univ. Tokyo in 2017
Associate professor, Graduate School of Arts and Sciences, Univ. Tokyo, since April, 2020
Brief history of Dr. Kaiji Motegi
B.S. in Economics, Waseda Univ. in 2008
PhD in Economics, Univ. of North Carolina at Chapel Hill in 2014
Associate Professor, Graduate School of Economics, Kobe Univ. since 2020
The 3rd Hosoya prize lecture by the recipients will be held in Nov. 2021 in Tohoku Univ. Details will be shown here soon.