no code implementations • 31 Jan 2022 • Hugues van Assel, Thibault Espinasse, Julien Chiquet, Franck Picard
Most popular dimension reduction (DR) methods like t-SNE and UMAP are based on minimizing a cost between input and latent pairwise similarities.
no code implementations • 17 Apr 2020 • Magali Champion, Julien Chiquet, Pierre Neuvial, Mohamed Elati, François Radvanyi, Etienne Birmelé
We propose a methodology for the identification of transcription factors involved in the deregulation of genes in tumoral cells.
no code implementations • 29 Oct 2018 • Florent Guinot, Marie Szafranski, Julien Chiquet, Anouk Zancarini, Christine Le Signor, Christophe Mougel, Christophe Ambroise
Our focus is on detecting interactions between groups of genetic and metagenomic markers in order to gain a better understanding of the complex relationship between environment and genome in the expression of a given phenotype.
no code implementations • 8 Jun 2018 • Julien Chiquet, Mahendra Mariadassou, Stéphane Robin
We adopt a different stance by relying on a latent model where we directly model counts by means of Poisson distributions that are conditional to latent (hidden) Gaussian correlated variables.
Methodology
no code implementations • 20 Mar 2017 • Julien Chiquet, Mahendra Mariadassou, Stéphane Robin
A typical example is the joint observation of the respective abundances of a set of species in a series of sites, aiming to understand the co-variations between these species.
Methodology
no code implementations • 7 Oct 2012 • Yves Grandvalet, Julien Chiquet, Christophe Ambroise
We illustrate on real and artificial datasets that this accuracy is required to for the correctness of the support of the solution, which is an important element for the interpretability of sparsity-inducing penalties.