Search Results for author: Pierre Borgnat

Found 13 papers, 6 papers with code

A Comparative Analysis of Gene Expression Profiling by Statistical and Machine Learning Approaches

1 code implementation1 Feb 2024 Myriam Bontonou, Anaïs Haget, Maria Boulougouri, Benjamin Audit, Pierre Borgnat, Jean-Michel Arbona

A collection of machine learning models including logistic regression, multilayer perceptron, and graph neural network are trained to classify samples according to their cancer type.

feature selection

Studying Limits of Explainability by Integrated Gradients for Gene Expression Models

1 code implementation19 Mar 2023 Myriam Bontonou, Anaïs Haget, Maria Boulougouri, Jean-Michel Arbona, Benjamin Audit, Pierre Borgnat

The scientific questions are formulated as classical learning problems on tabular data or on graphs, e. g. phenotype prediction from gene expression data.

Clustering with Simplicial Complexes

no code implementations14 Mar 2023 Thummaluru Siddartha Reddy, Sundeep Prabhakar Chepuri, Pierre Borgnat

Then, leveraging the Cheeger inequality, we propose the simplicial spectral clustering algorithm.

Clustering

A Simple Way to Learn Metrics Between Attributed Graphs

no code implementations26 Sep 2022 Yacouba Kaloga, Pierre Borgnat, Amaury Habrard

Therefore, many metric learning algorithms have been developed in recent years, mainly for Euclidean data in order to improve performance of classification or clustering methods.

Metric Learning

Probabilistic forecasts of extreme heatwaves using convolutional neural networks in a regime of lack of data

2 code implementations1 Aug 2022 George Miloshevich, Bastien Cozian, Patrice Abry, Pierre Borgnat, Freddy Bouchet

The main scientific message is that most of the time, training neural networks for predicting extreme heatwaves occurs in a regime of lack of data.

Transfer Learning

Fast Multiscale Diffusion on Graphs

1 code implementation29 Apr 2021 Sibylle Marcotte, Amélie Barbe, Rémi Gribonval, Titouan Vayer, Marc Sebban, Pierre Borgnat, Paulo Gonçalves

Diffusing a graph signal at multiple scales requires computing the action of the exponential of several multiples of the Laplacian matrix.

Deep Learning-based Extreme Heatwave Forecast

no code implementations17 Mar 2021 Valérian Jacques-Dumas, Francesco Ragone, Pierre Borgnat, Patrice Abry, Freddy Bouchet

The present work explores the use of deep learning architectures, trained using outputs of a climate model, as an alternative strategy to forecast the occurrence of extreme long-lasting heatwaves.

Transfer Learning

Solving NMF with smoothness and sparsity constraints using PALM

1 code implementation31 Oct 2019 Raimon Fabregat, Nelly Pustelnik, Paulo Gonçalves, Pierre Borgnat

Non-negative matrix factorization is a problem of dimensionality reduction and source separation of data that has been widely used in many fields since it was studied in depth in 1999 by Lee and Seung, including in compression of data, document clustering, processing of audio spectrograms and astronomy.

Astronomy Clustering +1

Harmonic analysis on directed graphs and applications: from Fourier analysis to wavelets

no code implementations28 Nov 2018 Harry Sevi, Gabriel Rilling, Pierre Borgnat

We introduce a novel harmonic analysis for functions defined on the vertices of a strongly connected directed graph of which the random walk operator is the cornerstone.

Design of graph filters and filterbanks

no code implementations3 Nov 2017 Nicolas Tremblay, Paulo Gonçalves, Pierre Borgnat

The aim of this chapter is to review general concepts for the introduction of filters and representations of graph signals.

Signal Processing Information Theory Social and Information Networks Information Theory

Accelerated Spectral Clustering Using Graph Filtering Of Random Signals

no code implementations29 Sep 2015 Nicolas Tremblay, Gilles Puy, Pierre Borgnat, Remi Gribonval, Pierre Vandergheynst

We build upon recent advances in graph signal processing to propose a faster spectral clustering algorithm.

Social and Information Networks Numerical Analysis

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