Research scientist @valeoai | Teaching @Polytechnique @ENS_ULM | Alumni @upb1818 @Mines_Paris @Inria @ENS_ULM | Feedback: https://xitter.cf/t.co/MHAm0ClYvh

Paris, France
Joined November 2008
The unreasonable magic of simplicity! Meet DrivoR (Driving on Registers): our latest end2end autonomous driving model. We teared down complex dependencies & modules from current models to obtain a pure Transformer-based SOTA driving agent (NAVSIM v1 & v2, HUGSIM). Find out more👇
1/🧵 Q: Can we have both a simple and SOTA architecture in autonomous driving? R: Yes! 😍 Introducing Driving on Registers (DrivoR): a pure Transformer backbone that achieves SOTA results in NAVSIM v1 / v2 and closed-loop HUGSIM evaluation. Here is how 👇
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Andrei Bursuc retweeted
Tinker's new StableReinforce objective is Reinforce + Score Centering. Here's how I reverse-engineered it 🧵
Off-policy RL is difficult; runs can suddenly collapse because of async RL staleness or numerical mismatch. StableReinforce is a new method on Tinker that keeps your RL runs stable, even when learning drifts from sampling. tinker-docs.thinkingmachines…
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Andrei Bursuc retweeted
With ReDi, @ThKouz, Nikos, and team, we showed the benefits of jointly modeling images and semantic features through diffusion. Now, @MathiasOllu and Nikos bring this idea to continuous diffusion LMs, jointly denoising tokens and semantic clusters. Love this! 🔥
🚀Improve Continuous Diffusion LMs by making them denoise hierarchical token representations! We introduce Hierarchical Continuous Diffusion LMs (H-CDLMs), which diffuse tokens *and* coarse semantic clusters jointly. ➡️ Better generations for less compute🧵
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🚀Improve Continuous Diffusion LMs by making them denoise hierarchical token representations! We introduce Hierarchical Continuous Diffusion LMs (H-CDLMs), which diffuse tokens *and* coarse semantic clusters jointly. ➡️ Better generations for less compute🧵
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Andrei Bursuc retweeted
Hi all, I have a new result I'm excited to share. It turns out that *all existing implementations* of softmax and cross-entropy (that's JAX, PyTorch, textbooks, etc) have a subtle bug --- two bugs, actually. A simple rewrite fixes both, and eliminates "slingshots" when grokking:
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Andrei Bursuc retweeted
Ever wondered what it’s like to learn robot autonomy @Stanford? Now you can. Today, we’re opening up the robot autonomy teaching materials that my collaborators and I have been developing over the past several years—for anyone, anywhere, completely free. At the heart of this effort is Principles of Robot Autonomy (PoRA), a textbook inspired by the Stanford robot autonomy course series I’ve been teaching since 2017. Robot autonomy has evolved from a research discipline into a technology deployed in the real world. Building capable autonomous systems requires more than understanding individual algorithms: it requires understanding how perception, state estimation, planning, control, and learning work together in a complete autonomy stack. That’s what we set out to teach with PoRA: bringing classical robotics and modern AI together in one coherent framework, grounded in both theory and practice. Coming soon in print from Cambridge University Press, Principles of Robot Autonomy is also freely available online and comes with a comprehensive collection of open educational resources: 📖 Textbook, arxiv.org/abs/2608.03496 — Foundations of robot autonomy, from classical methods to modern AI-based approaches. 🎥 Video lectures, porabook.com/lectures/ Lectures from my Stanford courses on robot autonomy and on optimal and learning-based control. 💻 Interactive exercises, porabook.com/exercises/ — Hands-on Python implementations and Jupyter notebooks. 📝 Teaching materials, porabook.com/instructors/ — Lecture slides and resources for instructors. 🌐 Explore all PoRA resources, porabook.com/ — Including Ask the Book, an AI study assistant integrated throughout the textbook to answer questions, explain derivations, and connect ideas across chapters. 📣 Read the Stanford announcement: news.stanford.edu/stories/20… Our goal is simple: to make high-quality education in robot autonomy accessible to students, researchers, engineers, educators, and anyone curious about how autonomous robotic systems work. I believe that sharing knowledge is fundamental to the mission of a university. Autonomous robotics—and Physical AI more broadly—are among the defining technological frontiers of our time. We want to help more people understand these technologies, build with them, and advance the field. A huge thank you to my co-authors, @DanieleGammelli, Joseph Lorenzetti, @katielulula, and @GioeleZardini, and to everyone who helped bring this project to life. Explore the resources, use them in your own learning or teaching, and please share them with anyone who might find them useful! #Robotics #PhysicalAI #ArtificialIntelligence #AutonomousSystems #Education @Stanford @StanfordEng @StanfordAILab @StanfordHAI
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The rise of AI-assisted peer review: reviewers are finally making it into the appendix.
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Some things in computer science stay the same in the era of coding agents: it's still the "laziest" who thrive the most, i.e., the ones that find ways to do less manual work and rather delegate to the machines.
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No need to baby-sit your training and hyper-parameters anymore: your agent can do it for you and way better
1/9 Current optimizers are static during training. What if the optimizer could think and react while the network trains? We let an agent watch the training dynamics and rewrite the optimizer's source code as training goes: a reactive optimizer. In every language and image setting we tried that has no tuned recipe, it matches or beats the best recipe one can one-shot, and it guards against loss spikes and overfitting by itself. In the near future, optimization decisions may belong to agents, not humans. 📝 xingjianbai.com/reactive-opt… 💻 Try it on your task: github.com/xingjian-bai/opal 🧵
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Andrei Bursuc retweeted
Why are French university students lining up for lunch at 11am when the cafeteria opens at noon? I took this picture on my way to work this morning because it is a good lesson in “shadow prices.” In May, France extended €1 university meals to all students. Previously, those not eligible for assistance paid €3.30. The result was not cheaper meals, but shortages. Demand surged, and students now queue an hour or more in advance to secure their lunch. What they used to pay with money, they now pay with time. And this is a lesson in shadow prices. It tells us that students are willing to sacrifice an additional hour to save €2.30, so they are implicitly valuing their time at €2.30 an hour or less. That's awful. 11 am is one of the best times to study. You are alert, but not yet tired. Even if a fraction of them studied at this time, there could be more value than the one saved by the “cheaper” meal. While the government did provide €50 million in additional funding for 2026, for a system serving more than 3 million higher-education students (about 8 cents per student per day), the problem illustrates something deeper about France. Don't get me wrong. I love living here, and I work hard every day to contribute to this country. But too many French institutions operate as though people's time were free. It is a system where enormous resources flow through the state, and simple transactions are replaced by forms, permissions, and waiting. People grow accustomed to this dependency, sometimes even demanding more of it. The implicit message of the system is that your time is cheap, your initiative is unwelcome, and your ability to decide for yourself is something to be managed. It is a sad situation because I genuinely believe France can be one of the best places in the world to live. But people are tired. And I'm not talking about those who looted sporting goods stores and vandalized public buildings over the weekend. I'm talking about the butchers, bakers, and produce sellers I meet every week at the market. The small antique dealers who worry that a mob could destroy the little capital they have. I talked to many of them yesterday. They are scared and they know there is nothing for them to do other than hide. A country that values its people should value their time. Vive la France!
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Well articulated post by @arthurmensch on why Europe should aim for frontier AI as well & be more optimistic. Don't know if Europe will catch up with this immediate wave, but working towards ambitious aims will eventually lead to all sorts of cool stuff whether aimed or sidetrack
Should Europe leave frontier AI to the Americans and the Chinese? The idea has gained ground in Europe. It is a fundamental mistake. Build or surrender: for now, the choice is still ours. Full article below.
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Andrei Bursuc retweeted
Today we’re releasing Muse Spark Open, the most capable US open-weight model to date. Built for coding and agentic work, it excels at long-horizon tasks, complex software engineering, and multi-step reasoning. Key Model Specs: → 816B total / 42B active parameters → 1M token context window → Natively multimodal across text, image, video, audio
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Andrei Bursuc retweeted
We are thrilled to announce that we have joined forces with @kesai_labs towards building generalist autonomous driving systems together. We aim high and plan to release models and code to push forward research boundaries. valeo.com/en/valeo-and-kesai…
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Thrilled about the partnership between @Valeo_Group and @kesai_labs towards open and high performing generalist autonomous driving systems. An ambitious agenda ahead of us together with a dream team of researchers. Let’s go! 🚗
We are excited to announce that we have joined forces with Valeo to launch a new partnership aimed at building generalist autonomous driving systems. Together, we will openly release models, code, and weights to advance physical AI research. kesai.eu/blog/2026-10-13-val…
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Andrei Bursuc retweeted
A glimpse into #computervision history. The inaugural #ECCV1990 was held over 4 days in Antibes, France. • ~40 attendees • 63 accepted papers • 60 oral presentations • 20 posters • 13 sessions Fast forward 36 years. How times have changed!
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Big fan of such works ever since ASIF (Coupled Data Turns Unimodal Models to Multimodal Without Training) came out a while ago, though without much traction until now arxiv.org/abs/2210.01738 Nice work!
DINOv2 has never seen a caption, and Qwen3 has never seen an image. We still aligned their embedding spaces without a single image-caption pair. It even works when the images and the captions come from different datasets. Project page: dominik-schnaus.github.io/un… ⬇️
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Folks, think twice before you ask Claude to write Java. This might get you a ban from Ant 🙃
Anthropic may start banning people for bullying Claude Their upcoming Usage Policy prohibits “sustained and needless abusive or cruel behavior toward our models”
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Andrei Bursuc retweeted
For everybody sharing their papers here, if you have a bit of scientific decency left, please add your sota table and a few ablation results at least at the bottom of your thread…🧵 if not, please consider labeling your post as advertisement.
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1/n Our paper REPA-G is accepted at #NeurIPS2026! 🎉 I'll present it at the NeurIPS Paris site 🇫🇷. We introduce test-time conditioning of REPA-style diffusion models with visual features, with no extra training.
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Andrei Bursuc retweeted
Besides scalability, self-supervised learning is attractive because we have a good real-life example of humans/mammals learning strong visual systems. BUT: they do not learn from shuffled image collections. They learn from (essentially) a single long visual stream. This is what we tackle in our new @NeurIPSConf paper, led by Ivan, together with @LukasKnobel1 and me. 1/ arxiv.org/abs/2609.40333
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The much awaited @stateofai report 2026 is now up. At this crazy level of things happening in AI, this is becoming the one tool to keep some sanity. Thanks @nathanbenaich for the amazing diligence.
welcome to the 9th annual @stateofai report! ai building better ai, world models, physical ai, geopolitics, cyber defense and 12-month predictions. read it at stateof(dot)ai or watch my editor’s cut here. a few of this year’s biggest findings follow:
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