Search Results for author: Julien Chiquet

Found 6 papers, 0 papers with code

A Probabilistic Graph Coupling View of Dimension Reduction

no code implementations31 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.

Dimensionality Reduction

Identification of deregulated transcription factors involved in subtypes of cancers

no code implementations17 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.

Fast Computation of Genome-Metagenome Interaction Effects

no code implementations29 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.

Variational inference for sparse network reconstruction from count data

no code implementations8 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

Variational inference for probabilistic Poisson PCA

no code implementations20 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

Sparsity by Worst-Case Penalties

no code implementations7 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.

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