Institut de Mathématiques de Toulouse

Les événements de la journée


4 événements


  • Séminaire de Probabilités

    Mardi 12 juin 09:45-10:45 - Raphael Chétrite - CNRS et Université de Nice

    On Gibbs-Shannon entropy

    Résumé : This talk will focus on the question of the physical contents of the Gibbs-Shannon entropy outside equilibrium.
    Article : Gavrilov-Chetrite-Bechhoeffer : Direct measurement of weakly nonequilibrium system entropy is consistent with Gibbs-Shannon form. PNAS 2017.

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  • Séminaire de Statistique

    Mardi 12 juin 11:00-12:00 - Charlotte Laclau

    Unsupervised learning through Rank-one Approximation

    Résumé : Optimal transportation (OT) problem is a powerful technique for aligning probability distributions that has recently found its application in various areas of machine learning including, for instance, computer vision, music unmixing and information retrieval.
    In this talk, I will present an algorithmic idea that we proposed in machine learning based on OT, that aims at discovering homogeneous groups of data objects and features by grouping them simultaneously. This approach uses the entropy regularized OT between empirical measures defined on data
    objects and features in order to obtain an estimated joint probability density function represented by the optimal coupling matrix.
    Following this work, I will introduce a novel unsupervised learning framework called rank-one co-clustering and show that several popular unsupervised algorithms can be seen as instances of this general framework, notably the algorithm for co-clustering based on entropy regularized optimal transport.
    The goal of this framework is to provide a new point of view for several unsupervised learning techniques that helps to gain a deeper understanding about the general mechanisms behind clustering.

    Lieu : Bat 1R1, Salle 106

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  • Séminaire MIP

    Mardi 12 juin 11:00-12:00 - Judith Vancostenoble - IMT

    Contrôle multiplicatif de l’équation de la chaleur avec potentiel singulier

    Lieu : Salle GMM13 à l'INSA

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  • Homotopie en Géométrie Algébrique

    Mardi 12 juin 14:00-15:00 - Jorge Antonio - IMT

    Homologie de Hochschild Topologique III

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