Les inscriptions aux journées MODE 2026 à Nice sont désormais ouvertes. Elles se dérouleront du 18 au 20 mars à l'Hôtel Saint-Paul. Les inscriptions sont ouvertes jusqu'au 1 mars (majoration > 9/02). La deadline pour soumettre une communication est le **15 janvier**.

Mail annuel du CNRS pour savoir si tu as obtenu le prix Nobel ✅

I am at #NeurIPS2025, reach out if you want to chat!

🏅Finalist: Gradient Scarcity in Graph Learning with Bilevel Optimization, by Hashem GHANEM, Samuel Vaiter, Nicolas Keriven 5/n openreview.net/forum?id=10Y...

Happy to be at #NeurIPS in San Diego to present our poster ‘Learning Theory for Kernel Bilevel Optimization’ #3005, Fri at 4:30 p.m. Stop by/ping me to chat, especially about statistics, causality, generative models! Let's connect! Joint w/ E. Pauwels, @samuelvaiter.com, @michael-arbel.bsky.social

I have several offers for Master internships / PhDs on graph ML funded by ERC MALAGA for 2026. Don't hesitate to contact me to apply! All infos here: nkeriven.github.io/malaga/

Drame : je me suis gouré de bus à Massy et là je visite *toute* la startup-nation

Est-ce que certain d'entre vous #ESR sont dans un laboratoire qui gère les missions / conférences avec un système de ticket genre GLPI ou Jira ? Si oui, est-ce que c'est l'apocalypse ou plutôt mieux qu'une gestion traditionnel ? Si non, quel niveau d'enthousiasme ou de dégout cela vous inspire ?

Les journées SMAI-MODE 2026 auront lieu à Nice du 18 au 20 mars 2026, précédées par un mini-cours les 16/17. Vous pouvez déposer votre proposition de contrib sur mode2026.sciencesconf.org Inscription à partir du 1er décembre pour finir le 1 mars (avec un tarif majoré à compter du 1 février).

Now accepted to #NeurIPS2025, congrats to @fareselkhoury.bsky.social for his first ML paper!

Happy to share that I have been promoted to senior research scientist (directeur de recherche (*)) at @cnrs.fr effective today! Grateful to my amazing students, collaborators and mentors who made this journey possible. I will continue my research at the math lab of UniCA @ljad-off.bsky.social.

Je viens de réaliser que mon employeur, sans me donner la possibilité d'acquérir un téléphone pro, exige une politique de sécurité sur mon code de smartphone pour accéder aux emails. Je viens donc de faire ce que j'aurai du faire il y a dix ans : enlever mes mails pros de mon téléphone perso 🤷‍♂️

Now accepted at #NeurIPS2025 :)

#Communiqué 🗞️ La médaille d'or 2025 du CNRS est décernée à Stéphane Mallat, mondialement reconnu pour ses travaux autour des mathématiques appliquées au traitement du signal et à l’intelligence artificielle. 👏 👉 cnrs.fr/fr/presse/en... #TalentsCNRS 🏅

Sur le marché public de ma fac, il y a deux hotels de disponible paris intra-muros (1 mois et demi en avance). Et pas "deux" comme une manière de dire peu, DEUX = D-E-U-X = 2. Putain de marché public à la con. Putain de règles administratives à la con.

20 years later I still love this city!

I'm BEYOND THRILLED to tell you that our first original song is now available on all platforms! Plz share if you like it 🙏🏼🙏🏼😊 Cheers

Congratulations to Dr. Sophie Jaffard @sophiejaffard.bsky.social for a brillant PhD defense! We were very lucky with Patricia to have you as a PhD student, and I am sure that you will have a brillant career ahead.

1/2 Julia Brun (M1) «Modèles particulaires de type Cucker-Smale et limites de champ moyen» gagne le prix K. Johnson 🎉 avec un voyage à Paris et visite de la Maison Poincaré #parité #maths #Nice06 #fillesEtMaths @cnrs-insmi.bsky.social @univcotedazur.bsky.social @cnrscotedazur.bsky.social

A reviewer in my batch submitted a review shorter than a tweet. wtf

AWS chatbot is amazing. Q: I cant login neither I can reset my password because phone number verification is not working. A: If you cant reset your password, login into your account to reset your MFA.

Expedition 33 might be overhyped. Let me add my contribution: This is an incredibile masterpiece.

New paper on the generalization of Flow Matching www.arxiv.org/abs/2506.03719 🤯 Why does flow matching generalize? Did you know that the flow matching target you're trying to learn *can only generate training points*? w @quentinbertrand.bsky.social @annegnx.bsky.social @remiemonet.bsky.social 👇👇👇

I am sure that the number of faculty follows the same curve /s

Ma matinée

It seems other authors* have just reached similar conclusions (large minibatches help for OT-CFM), using entropic-reg OT in place of our bilevel-sliced OT * Michal Klein, Alireza Mousavi-Hosseini, Stephen Zhang, @marcocuturi.bsky.social arxiv.org/abs/2506.05526

I wrote in my notes few years ago a *suboptimal* (and maybe wrong 😅) lower bounds of GD for smooth strongly convex function. Nesterov's proof uses seq w/ values in ℝ^ℕ (so infinite dimensional), whereas I do a similar strategy as in the convex case, ie in ℝ^n 1/3 samuelvaiter.com/intro-to-low...

I play Expedition 33 in story mode, and found it not that easy (*). This evening, I launched the game and was impressed with myself because I was much better at parrying than usual. And then I saw the patch notes ... 🥲 (*) translation: I'm getting slaughtered.

One of my papers with @sophiejaffard.bsky.social just turned one 🎂. No reviews yet, but I’m sure the reviewers are carefully choosing every word (one per day).

Le prochain Data Science Colloquium à l'ENS, jeudi 12 juin, sera donné par David Louapre d'Ubisoft, "What modern AI and neuroscience can bring to non-playing characters in video games". David c'est bien sûr également le vulgarisateur scientifique de www.youtube.com/scienceetonn...

📣 New preprint 📣 **Differentiable Generalized Sliced Wasserstein Plans** w/ L. Chapel @rtavenar.bsky.social We propose a Generalized Sliced Wasserstein method that provides an approximated transport plan and which admits a differentiable approximation. arxiv.org/abs/2505.22049 1/5

They say "emacs bankruptcy". I say Marie Kondo x dotemacs = ❤️

Most (?) misunderstood theorems in pop culture 1. Godel's incompleteness theorem 2. Curry-Howard correspondence 3. Universal approximation of neural networks

I have cleaned a bit my lecture notes on Optimal Transport for Machine Learners arxiv.org/abs/2505.06589

Convolution theorem: Fourier transform of the convolution of two functions (under suitable assumptions) is the product of the Fourier transforms of these two functions. buff.ly/aOamDMF

Dual numbers correspond to the completion of the real line with an nilpotent element ε different from 0. It can be thought as a universal linearization of functions, or as the forward-mode of automatic differentiation. buff.ly/vahZ0Fk

Convergence of iterates does not imply convergence of the derivatives. Nevertheless, Gilbert (1994) proposed an interversion limit-derivative theorem under strong assumption on the spectrum of the derivatives. buff.ly/MhK7qiI

Leader-follower games, also known as Stackelberg games, are models in game theory where one player (the leader) makes a decision first, and the other player (the follower) responds, considering the leader’s action. This is one the first instance of bilevel optimization.

The Matrix Mortality Problem asks if a given set of square matrices can multiply to the zero matrix after a finite sequence of multiplications of elements. It is is undecidable for matrices of size 3x3 or larger. buff.ly/lLmvvlo

The SAT problem asks whether a logical formula, composed of variables and (AND, OR, NOT), can be satisfied by assigning True to the variables. SAT is NP-complete along with 3-SAT, with clauses of three literals, while 2-SAT, is in P! buff.ly/mMLGbw4

The Krein-Milman theorem states that any compact convex subset of a locally convex topological vector space is the closed convex hull of its extreme points. In particular, the set of extreme points of a nonempty compact convex set is nonempty. buff.ly/6aYS8ox

The Stone-Weierstrass theorem states that any continuous function on a compact Hausdorff space can be uniformly approximated by elements of a subalgebra, provided the subalgebra separates points and contains constants. buff.ly/MbZOAG0

The Nesterov Accelerated Gradient (NAG) algorithm refines gradient descent by using an extrapolation step before computing the gradient. It leads to faster convergence for smooth convex functions, achieving the optimal rate of O(1/k^2). www.mathnet.ru/links/ceedfb...

The pinhole camera model illustrates the concept of projective projection. Light rays from a 3D scene pass through an (infinitely) small aperture — the pinhole — and project onto a 2D surface, creating an inverted image on the focal plan. monoskop.org/images/f/ff/...

Łojasiewicz inequality provides a way to control how close points are to the zeros of a real analytic function based on the value of the function itself. Extension of this result to semialgebraic or o-minimal functions exist. matwbn.icm.edu.pl/ksiazki/sm/s...

The fast inverse square root trick from Quake III is an algorithm to quickly approximate 1/√x, crucial for 3D graphics (normalisation). It uses bit-level manipulation and Newton's method for refinement. web.archive.org/web/20170729...

A Monge map, i.e., a solution to optimal transport Monge problems, may not always exist, be unique, or be symmetric with respect to the source and target distributions. It was one of the motivation to introduce Kantorovich relaxation. math.univ-lyon1.fr/~santambrogi...

Attouch’ theorem relates the (epi-) convergence of convex lsc functions to the convergence of their subdifferential seen as graph on the product between the space and its dual. gallica.bnf.fr/ark:/12148/b...

Brenier's theorem states that the optimal transport map between two probability measures for quadratic cost is the gradient of a convex function. Moreover, it is uniquely defined up to a Lebesgue negligible set. www.ceremade.dauphine.fr/~carlier/Bre...

The Weierstrass function is a famous example of a continuous function that is nowhere differentiable. It defies intuition by being continuous everywhere but having no tangent at any point. Introduced by Karl Weierstrass in 1872.