Thomas Schön

Thomas Schön, Professor of Automatic Control at Uppsala University. Photo: Mikael Wallerstedt

Our aim is to automate the extraction of knowledge and understanding from data. Allowing machines (and humans) to understand what is happening and to acquire new skills and learn new things. We achieve this by developing new probabilistic models and deriving algorithms capable of learnings these models from data. The systematic use of probability in representing and manipulating these models is key. It allows us to represent not only what we know, but to some extent also what we do not know. We take a particular interest in dynamical phenomena evolving over time.

Our research is multi-disciplinary and it sits somewhere on the intersection of the areas of Machine learning and statistics, signal processing, automatic control and computer vision. We pursue both basic and applied research, which explains our tight collaboration with various companies. A slightly more detailed overview of our research is available here.

Recent research results/news

June 7, 2018 [New Automatica paper] We revisit the classical problem of maximum likelihood learning of linear time-invariant state space models. Our contribution is that we add model stability guarantees by combining Lagrangian relaxation with the expectation maximization (EM) algorithm to build tight bounds on the likelihood. We then derive two algorithms that can be used to optimize these bounds over convex parameterizations of all stable linear models using semidefinite programming.

[J34] Jack Umenberger, Johan Wågberg, Ian Manchester and Thomas B. Schön. Maximum likelihood identification of stable linear dynamical systems. Automatica, 2018. (Accepted for publication) [arXiv] [code]

June 1, 2018 [2 guest PhD students] Over the coming month I am very glad to welcome our two guest PhD students Timothy Rogers from the University of Sheffield in the UK and Matteo Scandella from the University of Bergamo in Italy. Both will be working on sequential Monte Carlo and Birch.

May 11, 2018 [Paper accepted for ICML] We provide new results for the problem of predicting spatio-temporal processes with temporal patterns that vary across spatial regions, when data is obtained as a stream. More specifically, we develop a localized spatio-temporal covariance model of the process that can capture spatially varying temporal periodicities in the data. We then apply a covariance-fitting methodology to learn the model parameters which yields a predictor that can be updated sequentially with each new data point.

[C105] Muhammad Osama, Dave Zachariah and Thomas B. Schön. Learning localized spatio-temporal models from streaming data. In Proceedings of the 35th International Conference on Machine Learning (ICML)Stockholm, Sweden, July, 2018. [arXiv]

birch

March 21, 2018 [First pre-release of our new probabilistic programming language Birch] Within our research project ASSEMBLE (funded by the Swedish Foundation for Strategic Research) we are developing a new probabilistic programming language, which we call Birch. Everyone is welcome to play with it. More information is available here.


Click here for older news.

 © Thomas Schön 2018