Search Results for author: Mattias Ohlsson

Found 8 papers, 3 papers with code

A Masked language model for multi-source EHR trajectories contextual representation learning

no code implementations7 Feb 2024 Ali Amirahmadi, Mattias Ohlsson, Kobra Etminani, Olle Melander, Jonas Björk

Using electronic health records data and machine learning to guide future decisions needs to address challenges, including 1) long/short-term dependencies and 2) interactions between diseases and interventions.

Language Modelling Representation Learning

Towards Explaining Satellite Based Poverty Predictions with Convolutional Neural Networks

no code implementations1 Dec 2023 Hamid Sarmadi, Thorsteinn Rögnvaldsson, Nils Roger Carlsson, Mattias Ohlsson, Ibrahim Wahab, Ola Hall

Deep convolutional neural networks (CNNs) have been shown to predict poverty and development indicators from satellite images with surprising accuracy.

Satellite Image and Machine Learning based Knowledge Extraction in the Poverty and Welfare Domain

no code implementations2 Mar 2022 Ola Hall, Mattias Ohlsson, Thortseinn Rögnvaldsson

Our review of the field shows that the status of the three core elements of explainable machine learning (transparency, interpretability and domain knowledge) is varied and does not completely fulfill the requirements set up for scientific insights and discoveries.

BIG-bench Machine Learning

The Concordance Index decomposition: A measure for a deeper understanding of survival prediction models

1 code implementation28 Feb 2022 Abdallah Alabdallah, Mattias Ohlsson, Sepideh Pashami, Thorsteinn Rögnvaldsson

In contrast to such deep learning methods, classical machine learning models deteriorate when the censoring level decreases due to their inability to improve on ranking the events versus other events.

Survival Analysis Survival Prediction

A New Bandit Setting Balancing Information from State Evolution and Corrupted Context

1 code implementation16 Nov 2020 Alexander Galozy, Slawomir Nowaczyk, Mattias Ohlsson

We present an algorithm that uses a referee to dynamically combine the policies of a contextual bandit and a multi-armed bandit.

Decision Making Efficient Exploration +1

Variational auto-encoders with Student's t-prior

1 code implementation6 Apr 2020 Najmeh Abiri, Mattias Ohlsson

We propose a new structure for the variational auto-encoders (VAEs) prior, with the weakly informative multivariate Student's t-distribution.

The advantage of using Student's t-priors in variational autoencoders

no code implementations25 Sep 2019 Najmeh Abiri, Mattias Ohlsson

Is it optimal to use the standard Gaussian prior in variational autoencoders?

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