Teemu Roos, Ph.D.

Contact Information


Adjunct Professor, Faculty of Science
University of Helsinki (2011)

Doctor of Philosophy (PhD) - Computer Science
University of Helsinki (2007)

Master of Science (M.Sc.) - Computer Science
University of Helsinki (2001)

Matriculation Examination
Tervakosken Lukio, Janakkala (1994)


Teemu is the leader of the Information, Complexity and Learning (ICL) research group, which is a part of the CoSCo research group led by Prof. Petri Myllymäki. He is also affiliated with the Academy of Finland funded Centre of Excellence COIN.


  1. J. Leppä-aho, J. Pensar, T. Roos, and J. Corander (2017). Learning Gaussian graphical models with fractional marginal pseudo-likelihoodInternational Journal of Approximate Reasoning 83:21–42. preprint
  2. V. Hyvönen, T. Pitkänen, S. Tasoulis, E. Jääsaari, R. Tuomainen, L. Wang, J. Corander, and T. Roos (2016). Fast nearest neighbor search through sparse random projections and voting, in Proc. 2016 IEEE International Conference on Big Data (IEEE Big-Data 2016), Washington DC, Dec. 5–8.  C++ library (with Python bindings) | benchmarks
  3. T. Roos (2016). Minimum Description Length Principle, in Sammut, C. and Webb G.I. (eds), Encyclopedia of Machine Learning and Data Mining, 2016.
  4. J. Tehrani, Q. Nguyen, and T. Roos, (2016). Oral fairy tale or literary fake? Investigating the origins of Little Red Riding Hood using phylogenetic network analysisDigital Scholarship in the Humanities 31(3):611–636.
  5. K. Watanabe and T. Roos, (2015). Achievability of asymptotic minimax regret by horizon-dependent and horizon-independent strategiesJMLR 16(Nov):2357–2375.
  6. A. Barron, T. Roos, and K. Watanabe, (2014). Bayesian properties of normalized maximum likelihood and its fast computation, in Proc. IEEE International Symposium on Information Theory (ISIT-2014), IEEE Press, pp. 1667–1671.
  7. M. Sherman, G. Clark, Y. Yang, S. Sugrim, A. Modig, J. Lindqvist, A. Oulasvirta, and T. Roos, (2014). User-generated free-form gestures for authentication: security and memorability, in Proc. 12th International Conference on Mobile Systems, Applications, and Services (MobiSys-2014), ACM Press, pp. 176–189.
  8. J. Rissanen, T. Roos, and P. Myllymäki, (2010). Model selection by sequentially normalized least squares,Journal of Multivariate Analysis 101:4, 839–849.   preprint | R code