Search Results for author: Matthieu Jonckheere

Found 13 papers, 3 papers with code

Score-Aware Policy-Gradient Methods and Performance Guarantees using Local Lyapunov Conditions: Applications to Product-Form Stochastic Networks and Queueing Systems

no code implementations5 Dec 2023 Céline Comte, Matthieu Jonckheere, Jaron Sanders, Albert Senen-Cerda

As a second contribution, we show that, under appropriate assumptions, the policy under a SAGE-based policy-gradient method has a large probability of converging to an optimal policy, provided that it starts sufficiently close to it, even with a nonconvex objective function and multiple maximizers.

Policy Gradient Methods Reinforcement Learning (RL)

Choosing the parameter of the Fermat distance: navigating geometry and noise

no code implementations30 Nov 2023 Frédéric Chazal, Laure Ferraris, Pablo Groisman, Matthieu Jonckheere, Frédéric Pascal, Facundo Sapienza

The Fermat distance has been recently established as a useful tool for machine learning tasks when a natural distance is not directly available to the practitioner or to improve the results given by Euclidean distances by exploding the geometrical and statistical properties of the dataset.

Navigate

FEMDA: a unified framework for discriminant analysis

no code implementations13 Nov 2023 Pierre Houdouin, Matthieu Jonckheere, Frederic Pascal

Although linear and quadratic discriminant analysis are widely recognized classical methods, they can encounter significant challenges when dealing with non-Gaussian distributions or contaminated datasets.

Symphony of experts: orchestration with adversarial insights in reinforcement learning

no code implementations25 Oct 2023 Matthieu Jonckheere, Chiara Mignacco, Gilles Stoltz

Structured reinforcement learning leverages policies with advantageous properties to reach better performance, particularly in scenarios where exploration poses challenges.

Decision Making reinforcement-learning

FEMDA: Une méthode de classification robuste et flexible

no code implementations4 Jul 2023 Pierre Houdouin, Matthieu Jonckheere, Frederic Pascal

Linear and Quadratic Discriminant Analysis (LDA and QDA) are well-known classical methods but can heavily suffer from non-Gaussian distributions and/or contaminated datasets, mainly because of the underlying Gaussian assumption that is not robust.

Classification

Clustering for directed graphs using parametrized random walk diffusion kernels

no code implementations1 Oct 2022 Harry Sevi, Matthieu Jonckheere, Argyris Kalogeratos

In this paper, we introduce a new clustering framework, the Parametrized Random Walk Diffusion Kernel Clustering (P-RWDKC), which is suitable for handling both directed and undirected graphs.

Clustering

Generalized Spectral Clustering for Directed and Undirected Graphs

no code implementations7 Mar 2022 Harry Sevi, Matthieu Jonckheere, Argyris Kalogeratos

In this paper, we present a generalized spectral clustering framework that can address both directed and undirected graphs.

Clustering graph partitioning

Robust classification with flexible discriminant analysis in heterogeneous data

1 code implementation9 Jan 2022 Pierre Houdouin, Frédéric Pascal, Matthieu Jonckheere, Andrew Wang

Linear and Quadratic Discriminant Analysis are well-known classical methods but can heavily suffer from non-Gaussian distributions and/or contaminated datasets, mainly because of the underlying Gaussian assumption that is not robust.

Classification Robust classification

Clustering high dimensional meteorological scenarios: results and performance index

no code implementations14 Dec 2020 Yamila Barrera, Leonardo Boechi, Matthieu Jonckheere, Vincent Lefieux, Dominique Picard, Ezequiel Smucler, Agustin Somacal, Alfredo Umfurer

The Reseau de Transport d'Electricit\'e (RTE) is the French main electricity network operational manager and dedicates large number of resources and efforts towards understanding climate time series data.

Clustering Dimensionality Reduction +4

Improving the performance of heterogeneous data centers through redundancy

no code implementations3 Mar 2020 Elene Anton, Urtzi Ayesta, Matthieu Jonckheere, Ina Verloop

As such, our result is the first in showing that redundancy can improve the stability and hence performance of a system when copies are non-i. i. d..

Networking and Internet Architecture Probability

Uncovering differential equations from data with hidden variables

no code implementations6 Feb 2020 Agustín Somacal, Yamila Barrera, Leonardo Boechi, Matthieu Jonckheere, Vincent Lefieux, Dominique Picard, Ezequiel Smucler

SINDy is a method for learning system of differential equations from data by solving a sparse linear regression optimization problem [Brunton et al., 2016].

RTE Time Series +1

A flexible EM-like clustering algorithm for noisy data

2 code implementations2 Jul 2019 Violeta Roizman, Matthieu Jonckheere, Frédéric Pascal

Though very popular, it is well known that the EM for GMM algorithm suffers from non-Gaussian distribution shapes, outliers and high-dimensionality.

Clustering

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