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Invited joint talk « Reduced representations of non linear manifolds: from reduced basis to (conditional) vector quantization of measures » at the Tenth Congress’s of the Romanian Mathematiciens held in Pitesti, Romania, June 30 to July 5th 2023
Intervention à la conférence :slides
I serve or have served to some editorial boards, including « J. Numer. Anal. Approx. Theory », Biology, « Annals of the « Alexandru Ioan Cuza » University of Iaşi (New Series). Mathematics »; « Libertas Mathematica (new series) » and some others …
I also am member of several conference program committees among which : LOD2022, LOD2023, FAAI24, FAAI25, NANMATH22, NANMATH23, NANMATH24, NANMATH25, COLFFRO26
Invited joint talk « A few key issues in Finance that Machine Learning is Helping Solve » with Pierre Brugiere presented at the 4th JP Morgan Global Machine Learning conference held in Paris, Nov 29 2022
Talk materials: slides ,link to the associated paper.
Intervention at the round table « Tools, issues and current practice in media boards » at the Dauphine Digital Days held Nov 21-23 2022 at the Université Paris Dauphine – PSL, Paris, France.
Executive summary: software in general and IA is used in many repetitive tasks in media (grammar correction, translation, data search, paper writing when the format is known as ‘trading day report’ or ‘election report’. But same techniques can also be used for more creative tasks, cf. craiyon,(try with « windy day in Paris »), singer, Midjourney gallery (paper on a prize won).
This opens the way to « deep fake » creation ex. youtube deepfake, which is the creation of objects that are fake but that pretend to be true. Deep fakes can and have been used to do harm and we cannot ignore it. Note that fake objects can still impact the real world (rumors can affect people and even the stock market and bansk, etc). But how to distinguish a ‘real’ object from a ‘fake’ one ? Difficult task and not sure the technology can solve it entirely. Some regulation is necessary, see our 
deep fakes repport. But ultimately this is within our hands and as always can be tacked with a ounce of good will.
Conference badge 🙂 
This is a talk presented at the Numerical Analysis, Numerical Modeling, Approximation Theory (NA-NM-AT 2022) conference, Cluj-Napoca, Romania, Oct 26-28 2022 
Talk materials: the slides of the presentation.
Abstract: motivated by statistical learning applications, the stochastic descent optimization algorithms are widely used today to tackle difficult numerical problems. One of the most known among them, the Stochastic Gradient Descent (SGD), has been extended in various ways resulting in Adam, Nesterov, momentum, etc. After a brief introduction to this framework, we introduce in this talk a new approach, called SGD-G2, which is a high order Runge-Kutta stochastic descent algorithm; the procedure allows for step adaptation in order to strike a optimal balance between convergence speed and stability. Numerical tests on standard datasets in machine learning are also presented together with further theoretical extensions.
Workshop on « Models, Human Behaviour and Infectious Diseases » of the Coordinated Action on Modelling of Infectious Diseases, Institut Pasteur, Paris May 23rd, 2022
This is a talk titled « Mathematical models in immunology: weekly neutralizing antibodies, antibody dependent enhancement and reinfection » presented at the UMI-MSE Seminars
Talk materials: the slides of the presentation. and the VIDEO RECORDING HERE.
M1 mathématiques appliquées, Université Paris Dauphine -PSL
Responsable: Gabriel TURINICI
Contenu
| Supports de cours | ||
| poly 2021/22, (MaJ=24/01/2022). | Poly annoté: à venir | notes manuscrites: à venir |
| Supports de cours | ||
| poly 2020/21, (dernière mise à jour 6 mai 2021). | Poly annoté | notes manuscrites |
 Cours 1 : sections 1.1-1.2 « Motivation » vidéo Youtube  | Cours 1: section 1.3 « Inégalités » vidéo Youtube | Cours 1, section 1.4 « Thm. de convergence classique » vidéo Youtube |
| Cours 2 :section 1.5 « Rappels espérance conditionnelle » vidéo Youtube | Cours 2 section 1.6 « Rappel variables symétriques » vidéo Youtube | Cours 2 section 1.7.1 « Rappels sur les tests paramétriques (1) » vidéo  Youtube |
Notes du cours : poly annoté cours 1et 2 (lien ancien, ne pas utiliser) , cours 3 , cours 3,4 notes manuscrites
corrigé ex 2018: regarder l’exo 3 qui démontre le fait que la convergence des cdf en tout point de continuité est pareil que celle de l’inverse généralisée.
Vidéos des séances de cours pendant confinement printemps 2020: Vidéo youtube sur le test du signe; Vidéo Youtube: test de Wilcoxon, Vidéo Youtube: propriétés des rangs.; Test de Mann-Whitney partie 1/2; Test de Mann-Whitney partie 2/2, Estimation de densité partie 1/1, Estimation de densité par estimateurs à noyau, vidéo régression non paramétrique, vidéos: régression non paramétrique par polynomes locaux, et régression: validation croisée et phénomène d’overfit,
