TABLE OF CONTENTS
- Upcoming Events
- Event report
- Person of the week
Person of the week
From the Office
The office of iTHES assistant, Ms.Chikako Oota is situated at the second floor of the main research building, room # 246. The extension number is 3261. She will be at the office from 10 a.m. to 16 p.m.
"Advanced Mean Field Theory of Restricted Boltzmann Machine"
Haiping Huang and Taro Toyoizumi (RIKEN Brain Science Institute (BSI))
Date and time: August 3, 3pm-
Place: Main research building, 4th floor, room 433
Learning in restricted Boltzmann machine is typically hard due to the computation of gradients of log-likelihood function. To describe the network state statistics of the restricted Boltzmann machine, we develop an advanced mean field theory based on the Bethe approximation. Our theory provides an efficient message passing based method that evaluates not only the partition function (free energy) but also its gradients without requiring statistical sampling. The results are compared with those obtained by the computationally expensive sampling based method.
iTHES Colloquium was held on July 6th inviting Prof. Takahiro Sagawa from the University of Tokyo as a lecturer. The title was "Thermodynamics of Information Processing,” and Prof. Sagawa explained his original work on the generalization of so-called Jarzynski equality and its application to the problems that involve the fundamental aspects of quantum physics and thermodynamics. He also expounded his most recent research, which can be applied to biological systems, such as Escherichia coli (E. coli), for example. Prof. Sagawa’s lecture thus covered various issues ranging from quantum physics to biology, just in accordance with the scope of iTHES project. It naturally attracted a large number (about 50) of audience.
On July 8, 2015, Dr. Masato Taki (ithes-phys fellow) visited Institute of Mathematics for Industry (IMI) in Kyushu Univ. http://www.imi.kyushu-u.ac.jp/eng/ to give a talk on his recent work on the theory of "Invisibility Cloak".
About 20 mathematicians got together and lots of deep questions were asked. IMI is located in the Ito Campus of Kyushu Univ. surrounded by full of green trees.
Person of the week
I am thrilled to be a member of the iTHES Interdisciplinary Mathematical and Computational Collaboration Team (MCC). “Data assimilation”, my research field, is interdisciplinary by nature and would have a lot of potential. I am really excited about working with iTHES colleagues for getting new ideas and insights into data assimilation. That would help achieve my goal of pioneering new, wider applications of data assimilation.
I started working on data assimilation since 2002, when I moved to Numerical Prediction Division, Japan Meteorological Agency (JMA). Upon completing the B.S. degree in theoretical physics from the Kyoto University in 2000, I started my professional career as a civil servant at JMA. After two years of administrative experience, I started my scientific career on numerical weather prediction and data assimilation. In 2003, I received a Japanese government fellowship to study at the University of Maryland (UMD) and completed both M.S. and Ph.D. degrees in meteorology on ensemble data assimilation within two years (I heard this is still the record of UMD!). In 2005, I moved back to JMA, in charge of developing the JMA's next generation ensemble data assimilation systems. In 2009, I moved to UMD as a Research Assistant Professor, and got deeply involved in education as a tenure-track Assistant Professor since 2011. In 2012, I started leading the Data Assimilation Research Team in RIKEN Advanced Institute for Computational Science, and has been working towards my goals of advancing the science of data assimilation as well as a deep commitment to education. My scientific achievements include more than 60 peer-reviewed publications and have been recognized by several prestigious awards such as the Yamamoto-Syono Award by the Meteorological Society of Japan (2008), the Young Scientists’ Prize by the Minister of Education, Culture, Sports, Science and Technology (2014), and the Nishida Prize by the Japan Geosciences Union (2015).