Search Results for author: Lassi Roininen

Found 8 papers, 1 papers with code

Log-Gaussian Gamma Processes for Training Bayesian Neural Networks in Raman and CARS Spectroscopies

no code implementations12 Oct 2023 Teemu Härkönen, Erik M. Vartiainen, Lasse Lensu, Matthew T. Moores, Lassi Roininen

We train two Bayesian neural networks to estimate parameters of the gamma process which can then be used to estimate the underlying Raman spectrum and simultaneously provide uncertainty through the estimation of parameters of a probability distribution.

Gaussian Processes Synthetic Data Generation

Mixtures of Gaussian Process Experts with SMC$^2$

no code implementations26 Aug 2022 Teemu Härkönen, Sara Wade, Kody Law, Lassi Roininen

Gaussian processes are a key component of many flexible statistical and machine learning models.

Gaussian Processes

Reconstruction and segmentation from sparse sequential X-ray measurements of wood logs

no code implementations20 Jun 2022 Sebastian Springer, Aldo Glielmo, Angelina Senchukova, Tomi Kauppi, Jarkko Suuronen, Lassi Roininen, Heikki Haario, Andreas Hauptmann

Thus, here we propose the use of a Dimension reduced Kalman Filter to accumulate information between slices and allow for sufficiently accurate reconstructions for further assessment of the object.

Computed Tomography (CT)

Blind hierarchical deconvolution

no code implementations22 Jul 2020 Arttu Arjas, Lassi Roininen, Mikko J. Sillanpää, Andreas Hauptmann

Deconvolution is a fundamental inverse problem in signal processing and the prototypical model for recovering a signal from its noisy measurement.

Non-Stationary Multi-layered Gaussian Priors for Bayesian Inversion

1 code implementation28 Jun 2020 Muhammad Emzir, Sari Lasanen, Zenith Purisha, Lassi Roininen, Simo Särkkä

In this article, we study Bayesian inverse problems with multi-layered Gaussian priors.

Statistics Theory Statistics Theory

Brexit Risk Implied by the SABR Martingale Defect in the EUR-GBP Smile

no code implementations12 Dec 2019 Petteri Piiroinen, Lassi Roininen, Martin Simon

We construct a data-driven statistical indicator for quantifying the tail risk perceived by the EURGBP option market surrounding Brexit-related events.

Posterior Inference for Sparse Hierarchical Non-stationary Models

no code implementations4 Apr 2018 Karla Monterrubio-Gómez, Lassi Roininen, Sara Wade, Theo Damoulas, Mark Girolami

Gaussian processes are valuable tools for non-parametric modelling, where typically an assumption of stationarity is employed.

Computation

Hyperpriors for Matérn fields with applications in Bayesian inversion

no code implementations9 Dec 2016 Lassi Roininen, Mark Girolami, Sari Lasanen, Markku Markkanen

We introduce non-stationary Mat\'ern field priors with stochastic partial differential equations, and construct correlation length-scaling with hyperpriors.

Statistics Theory Statistics Theory

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