1 code implementation • 22 Dec 2023 • Wouter M. Kouw
We propose an adaptive model-predictive controller that balances driving the system to a goal state and seeking system observations that are informative with respect to the parameters of a nonlinear autoregressive exogenous model.
no code implementations • 28 Sep 2022 • Alp Sarı, Tak Kaneko, Lense H. M. Swaenen, Wouter M. Kouw
We address object tracking by radar and the robustness of the current state-of-the-art methods to process outliers.
1 code implementation • 2 Sep 2020 • Wouter M. Kouw
Online system identification is the estimation of parameters of a dynamical system, such as mass or friction coefficients, for each measurement of the input and output signals.
no code implementations • L4DC 2020 • Ismail Senoz, Albert Podusenko, Wouter M. Kouw, Bert de Vries
We address the problem of online Bayesian state and parameter tracking in autoregressive (AR) models with time-varying process noise variance.
1 code implementation • 27 Feb 2020 • Evelien Schat, Rens van de Schoot, Wouter M. Kouw, Duco Veen, Adriënne M. Mendrik
In a broad range of fields it may be desirable to reuse a supervised classification algorithm and apply it to a new data set.
1 code implementation • 11 Mar 2019 • Wouter M. Kouw, Silas N. Ørting, Jens Petersen, Kim S. Pedersen, Marleen de Bruijne
Here we present a smoothness prior that is fit to segmentations produced at another medical center.
1 code implementation • 16 Jan 2019 • Wouter M. Kouw, Marco Loog
Feature-based methods revolve around on mapping, projecting and representing features such that a source classifier performs well on the target domain and inference-based methods incorporate adaptation into the parameter estimation procedure, for instance through constraints on the optimization procedure.
no code implementations • 31 Dec 2018 • Wouter M. Kouw, Marco Loog
Domain adaptation and transfer learning are sub-fields within machine learning that are concerned with accounting for these types of changes.
1 code implementation • 17 Oct 2018 • Wouter M. Kouw, Marco Loog, Wilbert Bartels, Adriënne M. Mendrik
Generalization of voxelwise classifiers is hampered by differences between MRI-scanners, e. g. different acquisition protocols and field strengths.
1 code implementation • 21 Jun 2018 • Wouter M. Kouw, Marco Loog
In practice, the data distribution at test time often differs, to a smaller or larger extent, from that of the original training data.
1 code implementation • 19 Apr 2018 • Wouter M. Kouw, Marco Loog
For sample selection bias settings, and for small sample sizes, the importance-weighted risk estimator produces overestimates for datasets in the body of the sampling distribution, i. e. the majority of cases, and large underestimates for data sets in the tail of the sampling distribution.
1 code implementation • 17 Oct 2017 • Wouter M. Kouw, Jesse H. Krijthe, Marco Loog
Cross-validation under sample selection bias can, in principle, be done by importance-weighting the empirical risk.
1 code implementation • 22 Sep 2017 • Wouter M. Kouw, Marco Loog, Lambertus W. Bartels, Adriënne M. Mendrik
Due to this acquisition related variation, classifiers trained on data from a specific scanner fail or under-perform when applied to data that was acquired differently.
1 code implementation • 25 Jun 2017 • Wouter M. Kouw, Marco Loog
In domain adaptation, classifiers with information from a source domain adapt to generalize to a target domain.
1 code implementation • 31 Jul 2016 • Wouter M. Kouw, Marco Loog
This paper identifies a problem with the usual procedure for L2-regularization parameter estimation in a domain adaptation setting.
no code implementations • 15 Dec 2015 • Wouter M. Kouw, Jesse H. Krijthe, Marco Loog, Laurens J. P. van der Maaten
Our empirical evaluation of FLDA focuses on problems comprising binary and count data in which the transfer can be naturally modeled via a dropout distribution, which allows the classifier to adapt to differences in the marginal probability of features in the source and the target domain.