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lebellig

@lebellig

Ph.D. student on generative models and domain adaptation for Earth observation πŸ›° Previously intern @SonyCSL, @Ircam, @Inria 🌎 Personal website: https://lebellig.github.io/

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08.12.2023
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Latest posts by lebellig @lebellig

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I have added a new tutorial on discrete diffusion models:
github.com/gpeyre/ot4ml

01.03.2026 14:40 πŸ‘ 51 πŸ” 15 πŸ’¬ 0 πŸ“Œ 0

I had a draft about how wild the pace of new generative models was… written two months ago. It’s already outdated. Somehow, things are moving even faster now... (and yes I’m back to posting about generative models)

20.02.2026 10:33 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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The unification of representation learning and generative modelling A deep dive into the convergence of discriminative and generative AI, covering 4 phases of evolution from REPA to RAE and beyond.

Too many REPA / RAE / representation alignment papers lately?
I was lost too, so I wrote a blog post that organizes the space into phases and zooms in on what actually matters for general/molecular ML.
Curious what folks think - link below!

πŸ”— Blog: kdidi.netlify.app/blog/ml/2025...

12.02.2026 06:27 πŸ‘ 10 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0

My first impression is that it will look like GANs for inverse problems but maybe there is something to do with the training drift term

08.02.2026 14:25 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Generative Modeling via Drifting Generative modeling can be formulated as learning a mapping f such that its pushforward distribution matches the data distribution. The pushforward behavior can be carried out iteratively at inference...

imo the original paper (arxiv.org/abs/2602.04770) is well written, but there are already some implementations/blog posts about it (github.com/Algomancer/M...)

07.02.2026 17:22 πŸ‘ 3 πŸ” 2 πŸ’¬ 1 πŸ“Œ 0

πŸ”³ Discrete drifting models
πŸ”³ Riemannian drifting models
πŸ”³ Optimal Transport drifting models
πŸ”³ Image2image drifting models
πŸ”³ Time-dependent drifting models (tricky one)
πŸ”³ Adversarial drifting models
πŸ”³ Wasserstein drifting models
πŸ”³ Variational drifting models
πŸ”³ Functional drifting models

07.02.2026 16:49 πŸ‘ 6 πŸ” 0 πŸ’¬ 3 πŸ“Œ 0

Very cool PhD project on generative models for dense detection of rare events in Earth Observation 🌍🌱

Nicolas has been my supervisor for the last 3 years, highly recommend doing a PhD with him!

03.02.2026 14:08 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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26-252 Dense Detection of Rare Events in Remote Sensing Using Generative Models Offre d’emploi 26-252 Dense Detection of Rare Events in Remote Sensing Using Generative Models au CNES Γ  75003 Paris !

πŸ“’ Fully funded PhD - 🌍 Dense Detection of Rare Events in Remote Sensing using Generative Models

Leverage generative models, unsupervised segmentation and explainability techniques to map disasters

w/ @javi-castillo.bsky.social and Flora Weissgerber

Apply ‡️
recrutement.cnes.fr/fr/annonce/4...

03.02.2026 12:51 πŸ‘ 8 πŸ” 8 πŸ’¬ 1 πŸ“Œ 1

Is it a vscode plugin?

23.01.2026 10:25 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Meta Flow Maps enable scalable reward alignment, Peter Potaptchik et al. (arxiv.org/abs/2601.14430)

This article introduces Meta Flow Maps: a stochastic generalization of consistency models (one-step generation) that allows efficient reward steering at inference time or during fine-tuning.

22.01.2026 09:15 πŸ‘ 5 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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I'm excited to open the new year by sharing a new perspective paper.

I give a informal outline of MD and how it can interact with Generative AI. Then, I discuss how far the field has come since the seminal contributions, such as Boltzmann Generators, and what is still missing

16.01.2026 10:25 πŸ‘ 19 πŸ” 5 πŸ’¬ 1 πŸ“Œ 1

Should we ban Brian Eno from bandcamp?

15.01.2026 17:08 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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A Cambridge PhD thesis in three research questions Geometric Deep Learning for Molecular Modelling and Design: A personal scientific journey

New blog πŸ’™: I reflect on why I worked on what I worked on...

I think a PhD is a very special time. You get to challenge yourself, push your boundaries, and grow. My thoughts go against the current AI/academia narrative online, so I hope you find it interesting.

chaitjo.substack.com/p/phd-thesis...

08.01.2026 04:38 πŸ‘ 10 πŸ” 2 πŸ’¬ 1 πŸ“Œ 0

Yes estimating distance between distributions with single sample sounds irrelevant. I wonder if flow-based artefacts are sufficiently similar across models with the same FID, allowing us to learn the score predictive model. I may try later!

08.01.2026 17:56 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Agree! I wonder if some generation artefacts are signatures that allow to predict the FID score (suppose that they are present in almost all generated images by a given model)

08.01.2026 17:41 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

You may add the real test (or training πŸ‘€) dataset if you are into leaderboard chasing

08.01.2026 17:33 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

1. Select many diffusion/flow-matching models
2. Generate 50k images per model
3. Use FID of each set as a label
4. Train a model to predict FID from a single image

What’s the probability this actually works, gives a cheap proxy for FID and enable fast generative model prototyping?

08.01.2026 15:17 πŸ‘ 2 πŸ” 0 πŸ’¬ 2 πŸ“Œ 1
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We introduce epiplexity, a new measure of information that provides a foundation for how to select, generate, or transform data for learning systems. We have been working on this for almost 2 years, and I cannot contain my excitement! arxiv.org/abs/2601.03220 1/7

07.01.2026 17:27 πŸ‘ 143 πŸ” 34 πŸ’¬ 9 πŸ“Œ 9
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Self-Supervised Learning from Noisy and Incomplete Data Many important problems in science and engineering involve inferring a signal from noisy and/or incomplete observations, where the observation process is known. Historically, this problem has been tac...

πŸ“– We put together with Mike Davies a review of self-supervised learning for inverse problems, covering the main approaches in the literature with a unified notation and analysis.

arxiv.org/abs/2601.03244

08.01.2026 12:37 πŸ‘ 8 πŸ” 4 πŸ’¬ 1 πŸ“Œ 0

Can we train neural networks just with permutations of their initial weights? And then whats the best initialisation distribution ?

10.12.2025 17:21 πŸ‘ 5 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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PS: We also recently released a unified codebase for discrete diffusion, check it out!

𝕏 Thread : x.com/nkalyanv99/...
πŸ”— GitHub: github.com/nkalyanv99/...
πŸ“š Docs: nkalyanv99.github.io/UNI-D2/

09.12.2025 16:06 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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πŸ†• β€œFoundations of Diffusion Models in General State Spaces: A Self-Contained Introduction”

Huge thanks to Tobias Hoppe, @k-neklyudov.bsky.social,
@alextong.bsky.social, Stefan Bauer and @andreadittadi.bsky.social for their supervision! πŸ™Œ

arxiv : arxiv.org/abs/2512.05092 πŸ§΅πŸ‘‡

09.12.2025 16:05 πŸ‘ 10 πŸ” 4 πŸ’¬ 1 πŸ“Œ 0
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I use drum mic kits for punchier presentations

08.12.2025 08:53 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Then I’m counting on the sound engineer to engage

07.12.2025 21:23 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

"Improved Mean Flows: On the Challenges of Fastforward Generative Models" arxiv.org/abs/2512.02012 questions this approximation and proposes a new training process for mean flows.

03.12.2025 21:32 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Hi @ google, can you provide 100k TPU hours to explore the design space of diffusion bridges for image-to-image translation? x1 vs drift pred, architectures and # params, # dataset, scaling couplings and batch sizes (for minibatch-based couplings). I can run everything in jax in return...

03.12.2025 21:19 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Yesterday, @nicolasdufour.bsky.social defended is PhD. I really enjoyed the years of collaboration w/ @vickykalogeiton.bsky.social (& @loicland.bsky.social)

Video: youtube.com/live/DXQ7FZA...

Big thanks to the jury @dlarlus.bsky.social @ptrkprz.bsky.social @gtolias.bsky.social A. Efros & T. Karras

27.11.2025 19:14 πŸ‘ 28 πŸ” 3 πŸ’¬ 1 πŸ“Œ 1

@climateainordics.com is now on youtube! Check out some amazing talks on how to help fight climate change using AI!

youtube.com/@climateaino...

26.11.2025 14:06 πŸ‘ 7 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
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@neuripsconf.bsky.social is two weeks away!

πŸ“’ Stop missing great workshop speakers just because the workshop wasn’t on your radar. Browse them all in one place:
robinhesse.github.io/workshop_spe...

(also available for @euripsconf.bsky.social)

#NeurIPS #EurIPS

19.11.2025 20:00 πŸ‘ 9 πŸ” 5 πŸ’¬ 1 πŸ“Œ 1

Calling it for today... I tried using the gemini 3 Pro preview to build some js animations, and it went well

18.11.2025 20:17 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0