Search Results for author: Karl Øyvind Mikalsen

Found 15 papers, 7 papers with code

A clinically motivated self-supervised approach for content-based image retrieval of CT liver images

2 code implementations11 Jul 2022 Kristoffer Knutsen Wickstrøm, Eirik Agnalt Østmo, Keyur Radiya, Karl Øyvind Mikalsen, Michael Christian Kampffmeyer, Robert Jenssen

We address these limitations by (1) proposing a self-supervised learning framework that incorporates domain-knowledge into the training procedure and (2) providing the first representation learning explainability analysis in the context of CBIR of CT liver images.

Content-Based Image Retrieval Representation Learning +2

The Kernelized Taylor Diagram

1 code implementation18 May 2022 Kristoffer Wickstrøm, J. Emmanuel Johnson, Sigurd Løkse, Gustau Camps-Valls, Karl Øyvind Mikalsen, Michael Kampffmeyer, Robert Jenssen

Our proposed kernelized Taylor diagram is capable of visualizing similarities between populations with minimal assumptions of the data distributions.

Data Visualization

RELAX: Representation Learning Explainability

1 code implementation19 Dec 2021 Kristoffer K. Wickstrøm, Daniel J. Trosten, Sigurd Løkse, Ahcène Boubekki, Karl Øyvind Mikalsen, Michael C. Kampffmeyer, Robert Jenssen

Our approach can also model the uncertainty in its explanations, which is essential to produce trustworthy explanations.

Representation Learning

Uncertainty-Aware Deep Ensembles for Reliable and Explainable Predictions of Clinical Time Series

1 code implementation16 Oct 2020 Kristoffer Wickstrøm, Karl Øyvind Mikalsen, Michael Kampffmeyer, Arthur Revhaug, Robert Jenssen

A measure of uncertainty in the relevance scores is computed by taking the standard deviation across the relevance scores produced by each model in the ensemble, which in turn is used to make the explanations more reliable.

Time Series Time Series Analysis

A Kernel to Exploit Informative Missingness in Multivariate Time Series from EHRs

no code implementations27 Feb 2020 Karl Øyvind Mikalsen, Cristina Soguero-Ruiz, Robert Jenssen

A large fraction of the electronic health records (EHRs) consists of clinical measurements collected over time, such as lab tests and vital signs, which provide important information about a patient's health status.

Ensemble Learning Imputation +2

Time series cluster kernels to exploit informative missingness and incomplete label information

no code implementations10 Jul 2019 Karl Øyvind Mikalsen, Cristina Soguero-Ruiz, Filippo Maria Bianchi, Arthur Revhaug, Robert Jenssen

To overcome this limitation, we present a kernel capable of exploiting the potentially rich information in the missing values and patterns, as well as the information from the observed data.

Ensemble Learning Imputation +2

Noisy multi-label semi-supervised dimensionality reduction

no code implementations20 Feb 2019 Karl Øyvind Mikalsen, Cristina Soguero-Ruiz, Filippo Maria Bianchi, Robert Jenssen

With the proposed Noisy multi-label semi-supervised dimensionality reduction (NMLSDR) method, the noisy multi-labels are denoised and unlabeled data are labeled simultaneously via a specially designed label propagation algorithm.

Supervised dimensionality reduction

An Unsupervised Multivariate Time Series Kernel Approach for Identifying Patients with Surgical Site Infection from Blood Samples

no code implementations21 Mar 2018 Karl Øyvind Mikalsen, Cristina Soguero-Ruiz, Filippo Maria Bianchi, Arthur Revhaug, Robert Jenssen

A large fraction of the electronic health records consists of clinical measurements collected over time, such as blood tests, which provide important information about the health status of a patient.

General Classification Imputation +2

Learning compressed representations of blood samples time series with missing data

1 code implementation20 Oct 2017 Filippo Maria Bianchi, Karl Øyvind Mikalsen, Robert Jenssen

Clinical measurements collected over time are naturally represented as multivariate time series (MTS), which often contain missing data.

General Classification Time Series +1

Time Series Cluster Kernel for Learning Similarities between Multivariate Time Series with Missing Data

1 code implementation3 Apr 2017 Karl Øyvind Mikalsen, Filippo Maria Bianchi, Cristina Soguero-Ruiz, Robert Jenssen

An ensemble learning approach is exploited to ensure robustness to parameters by combining the clustering results of many GMM to form the final kernel.

Clustering Ensemble Learning +2

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