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Sylvain Chevallier

5 accepted papers

2025

Wrapped Gaussian on the manifold of Symmetric Positive Definite Matrices

ICML 2025poster

Circular and non-flat data distribution are prevalent across diverse domains of data science, yet their specific geometric structures often remain underutilized in machine learning frameworks. A principled approach to accounting for the underlying geometry of such data is pivotal, particularly when…

Cited by 0SourcePDFScholar
2024

Geodesic Optimization for Predictive Shift Adaptation on EEG data

NeurIPS 2024spotlight

Electroencephalography (EEG) data is often collected from diverse contexts involving different populations and EEG devices. This variability can induce distribution shifts in the data $X$ and in the biomedical variables of interest $y$, thus limiting the application of supervised machine learning (M…

Cited by 4SourcePDFScholar
2021

Riemannian Geometry on Connectivity for Clinical BCI

ICASSP 2021accepted

Riemannian BCI based on EEG covariance have won many data competitions and achieved very high classification results on BCI datasets. To increase the accuracy of BCI systems, we propose an approach grounded on Riemannian geometry that extends this framework to functional connectivity measures. This…

Cited by 0SourceScholar
2021

Subspace Oddity - Optimization on Product of Stiefel Manifolds for EEG Data

ICASSP 2021accepted

Dimensionality reduction of high-dimensional electroencephalography (EEG) covariance matrices is crucial for effective utilization of Riemannian geometry in Brain-Computer Interfaces (BCI). In this paper, we propose a novel similarity-based classification method that relies on dimensionality reducti…

Cited by 0SourceScholar
2020

Semi-Supervised Optimal Transport Methods for Detecting Anomalies

ICASSP 2020accepted

Building upon advances on optimal transport and anomaly detection, we propose a generalization of an unsupervised and automatic method for detection of significant deviation from reference signals. Unlike most existing approaches for anomaly detection, our method is built on a non-parametric framewo…

Cited by 0SourceScholar