Search Results for author: Quentin Barthélemy

Found 12 papers, 8 papers with code

Spectral Norm of Convolutional Layers with Circular and Zero Paddings

1 code implementation31 Jan 2024 Blaise Delattre, Quentin Barthélemy, Alexandre Allauzen

This paper leverages the use of \emph{Gram iteration} an efficient, deterministic, and differentiable method for computing spectral norm with an upper bound guarantee.

Efficient Bound of Lipschitz Constant for Convolutional Layers by Gram Iteration

1 code implementation25 May 2023 Blaise Delattre, Quentin Barthélemy, Alexandre Araujo, Alexandre Allauzen

Since the control of the Lipschitz constant has a great impact on the training stability, generalization, and robustness of neural networks, the estimation of this value is nowadays a real scientific challenge.

End-to-end P300 BCI using Bayesian accumulation of Riemannian probabilities

1 code implementation15 Mar 2022 Quentin Barthélemy, Sylvain Chevallier, Raphaëlle Bertrand-Lalo, Pierre Clisson

In brain-computer interfaces (BCI), most of the approaches based on event-related potential (ERP) focus on the detection of P300, aiming for single trial classification for a speller task.

Classification ERP

Multi-dimensional signal approximation with sparse structured priors using split Bregman iterations

no code implementations29 Sep 2016 Yoann Isaac, Quentin Barthélemy, Cédric Gouy-Pailler, Michèle Sebag, Jamal Atif

This paper addresses the structurally-constrained sparse decomposition of multi-dimensional signals onto overcomplete families of vectors, called dictionaries.

Online SSVEP-based BCI using Riemannian geometry

2 code implementations Neurocomputing 2016 Emmanuel Kalunga, Sylvain Chevallier, Quentin Barthélemy, Karim Djouani, Eric Monacelli, Yskandar Hamam

We propose a novel algorithm for online and asynchronous processing of brain signals, borrowing principles from semi-unsupervised approaches and following a dynamic stopping scheme to provide a prediction as soon as possible.

EEG General Classification +1

On the need for metrics in dictionary learning assessment

1 code implementation EUSIPCO 2014 Sylvain Chevallier, Quentin Barthélemy, Jamal Atif

Dictionary-based approaches are the focus of a growing attention in the signal processing community, often achieving state of the art results in several application fields.

Dictionary Learning

Subspace metrics for multivariate dictionaries and application to EEG

1 code implementation ICASSP 2014 Sylvain Chevallier, Quentin Barthélemy, Jamal Atif

Overcomplete representations and dictionary learning algorithms are attracting a growing interest in the machine learning community.

Clustering Dictionary Learning +1

Multi-dimensional sparse structured signal approximation using split Bregman iterations

no code implementations21 Mar 2013 Yoann Isaac, Quentin Barthélemy, Jamal Atif, Cédric Gouy-Pailler, Michèle Sebag

An extensive empirical evaluation shows how the proposed approach compares to the state of the art depending on the signal features.

Metrics for Multivariate Dictionaries

1 code implementation18 Feb 2013 Sylvain Chevallier, Quentin Barthélemy, Jamal Atif

Despite a recurrent need to rely on a distance for learning or assessing multivariate overcomplete representations, no metrics in their underlying spaces have yet been proposed.

Clustering Dictionary Learning +1

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