Search Results for author: Lars Kai Hansen

Found 32 papers, 9 papers with code

Knowledge graphs for empirical concept retrieval

2 code implementations10 Apr 2024 Lenka Tětková, Teresa Karen Scheidt, Maria Mandrup Fogh, Ellen Marie Gaunby Jørgensen, Finn Årup Nielsen, Lars Kai Hansen

Concept-based explainable AI is promising as a tool to improve the understanding of complex models at the premises of a given user, viz.\ as a tool for personalized explainability.

General Knowledge Knowledge Graphs +1

Hubness Reduction Improves Sentence-BERT Semantic Spaces

1 code implementation30 Nov 2023 Beatrix M. G. Nielsen, Lars Kai Hansen

We find that when hubness is high, we can reduce error rate and hubness using hubness reduction methods.

Information Retrieval Retrieval +1

Masked Autoencoders with Multi-Window Local-Global Attention Are Better Audio Learners

no code implementations1 Jun 2023 Sarthak Yadav, Sergios Theodoridis, Lars Kai Hansen, Zheng-Hua Tan

In this work, we propose a Multi-Window Masked Autoencoder (MW-MAE) fitted with a novel Multi-Window Multi-Head Attention (MW-MHA) module that facilitates the modelling of local-global interactions in every decoder transformer block through attention heads of several distinct local and global windows.

Decoder

Robustness of Visual Explanations to Common Data Augmentation

1 code implementation18 Apr 2023 Lenka Tětková, Lars Kai Hansen

As the use of deep neural networks continues to grow, understanding their behaviour has become more crucial than ever.

Data Augmentation

On the role of Model Uncertainties in Bayesian Optimization

no code implementations14 Jan 2023 Jonathan Foldager, Mikkel Jordahn, Lars Kai Hansen, Michael Riis Andersen

In this work, we provide an extensive study of the relationship between the BO performance (regret) and uncertainty calibration for popular surrogate models and compare them across both synthetic and real-world experiments.

Bayesian Optimization Decision Making +1

Topic Model Robustness to Automatic Speech Recognition Errors in Podcast Transcripts

no code implementations25 Sep 2021 Raluca Alexandra Fetic, Mikkel Jordahn, Lucas Chaves Lima, Rasmus Arpe Fogh Egebæk, Martin Carsten Nielsen, Benjamin Biering, Lars Kai Hansen

We then observe how the cosine similarities decrease as transcription noise increases and conclude that even when automatic speech recognition transcripts are erroneous, it is still possible to obtain high-quality topic embeddings from the transcriptions.

Automatic Speech Recognition Automatic Speech Recognition (ASR) +1

Generalization by design: Shortcuts to Generalization in Deep Learning

no code implementations5 Jul 2021 Petr Taborsky, Lars Kai Hansen

Instead, we show that good generalization may be instigated by bounded spectral products over layers leading to a novel geometric regularizer.

A simple defense against adversarial attacks on heatmap explanations

no code implementations13 Jul 2020 Laura Rieger, Lars Kai Hansen

With machine learning models being used for more sensitive applications, we rely on interpretability methods to prove that no discriminating attributes were used for classification.

BIG-bench Machine Learning

Probabilistic Decoupling of Labels in Classification

no code implementations16 Jun 2020 Jeppe Nørregaard, Lars Kai Hansen

In this paper we develop a principled, probabilistic, unified approach to non-standard classification tasks, such as semi-supervised, positive-unlabelled, multi-positive-unlabelled and noisy-label learning.

Classification General Classification

IROF: a low resource evaluation metric for explanation methods

1 code implementation9 Mar 2020 Laura Rieger, Lars Kai Hansen

The adoption of machine learning in health care hinges on the transparency of the used algorithms, necessitating the need for explanation methods.

BIG-bench Machine Learning

Robustness analytics to data heterogeneity in edge computing

1 code implementation12 Feb 2020 Jia Qian, Lars Kai Hansen, Xenofon Fafoutis, Prayag Tiwari, Hari Mohan Pandey

Second, we study a classifier aggregated from a collection of local classifiers trained by data through active sampling at the edge.

Edge-computing Federated Learning

Aggregating explanation methods for neural networks stabilizes explanations

no code implementations25 Sep 2019 Laura Rieger, Lars Kai Hansen

Despite a growing literature on explaining neural networks, no consensus has been reached on how to explain a neural network decision or how to evaluate an explanation.

Probabilistic Decoupling of Labels in Classification

no code implementations29 May 2019 Jeppe Nørregaard, Lars Kai Hansen

We investigate probabilistic decoupling of labels supplied for training, from the underlying classes for prediction.

Classification General Classification

Phase transition in PCA with missing data: Reduced signal-to-noise ratio, not sample size!

1 code implementation2 May 2019 Niels Bruun Ipsen, Lars Kai Hansen

It has been shown that learning signal structure in terms of principal components is dependent on the ratio of sample size and dimensionality and that a critical number of observations is needed before learning starts (Biehl and Mietzner, 1993).

Aggregating explanation methods for stable and robust explainability

no code implementations1 Mar 2019 Laura Rieger, Lars Kai Hansen

Despite a growing literature on explaining neural networks, no consensus has been reached on how to explain a neural network decision or how to evaluate an explanation.

Multi-View Bayesian Correlated Component Analysis

no code implementations7 Feb 2018 Simon Kamronn, Andreas Trier Poulsen, Lars Kai Hansen

Correlated component analysis as proposed by Dmochowski et al. (2012) is a tool for investigating brain process similarity in the responses to multiple views of a given stimulus.

EEG

Latent Space Oddity: on the Curvature of Deep Generative Models

1 code implementation ICLR 2018 Georgios Arvanitidis, Lars Kai Hansen, Søren Hauberg

Deep generative models provide a systematic way to learn nonlinear data distributions, through a set of latent variables and a nonlinear "generator" function that maps latent points into the input space.

Clustering

Adaptive Smoothing in fMRI Data Processing Neural Networks

no code implementations2 Oct 2017 Albert Vilamala, Kristoffer Hougaard Madsen, Lars Kai Hansen

Functional Magnetic Resonance Imaging (fMRI) relies on multi-step data processing pipelines to accurately determine brain activity; among them, the crucial step of spatial smoothing.

EEG source imaging assists decoding in a face recognition task

no code implementations17 Apr 2017 Rasmus S. Andersen, Anders U. Eliasen, Nicolai Pedersen, Michael Riis Andersen, Sofie Therese Hansen, Lars Kai Hansen

In this work we explore the generality of Edelman et al. hypothesis by considering decoding of face recognition.

Neurons and Cognition

Towards end-to-end optimisation of functional image analysis pipelines

no code implementations13 Oct 2016 Albert Vilamala, Kristoffer Hougaard Madsen, Lars Kai Hansen

The study of neurocognitive tasks requiring accurate localisation of activity often rely on functional Magnetic Resonance Imaging, a widely adopted technique that makes use of a pipeline of data processing modules, each involving a variety of parameters.

Brain Decoding

A Locally Adaptive Normal Distribution

no code implementations NeurIPS 2016 Georgios Arvanitidis, Lars Kai Hansen, Søren Hauberg

The multivariate normal density is a monotonic function of the distance to the mean, and its ellipsoidal shape is due to the underlying Euclidean metric.

EEG

Dreaming More Data: Class-dependent Distributions over Diffeomorphisms for Learned Data Augmentation

no code implementations9 Oct 2015 Søren Hauberg, Oren Freifeld, Anders Boesen Lindbo Larsen, John W. Fisher III, Lars Kai Hansen

We then learn a class-specific probabilistic generative models of the transformations in a Riemannian submanifold of the Lie group of diffeomorphisms.

Data Augmentation Feature Engineering

Bayesian inference for spatio-temporal spike-and-slab priors

no code implementations15 Sep 2015 Michael Riis Andersen, Aki Vehtari, Ole Winther, Lars Kai Hansen

In this work, we address the problem of solving a series of underdetermined linear inverse problems subject to a sparsity constraint.

Bayesian Inference

Spatio-temporal Spike and Slab Priors for Multiple Measurement Vector Problems

no code implementations19 Aug 2015 Michael Riis Andersen, Ole Winther, Lars Kai Hansen

We are interested in solving the multiple measurement vector (MMV) problem for instances, where the underlying sparsity pattern exhibit spatio-temporal structure motivated by the electroencephalogram (EEG) source localization problem.

EEG

A Topic Model Approach to Multi-Modal Similarity

no code implementations27 May 2014 Rasmus Troelsgård, Bjørn Sand Jensen, Lars Kai Hansen

Calculating similarities between objects defined by many heterogeneous data modalities is an important challenge in many multimedia applications.

Dimensionality reduction for click-through rate prediction: Dense versus sparse representation

no code implementations27 Nov 2013 Bjarne Ørum Fruergaard, Toke Jansen Hansen, Lars Kai Hansen

In this work, we propose to use dimensionality reduction of the user-website interaction graph in order to produce simplified features of users and websites that can be used as predictors of clickthrough rate.

Click-Through Rate Prediction Dimensionality Reduction

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