Gaël Varoquaux
@gaelvaroquaux.bsky.social
Research & code: Research director @inria
►Data, Health, & Computer science
►Python coder, (co)founder of scikit-learn, joblib, & @probabl.bsky.social
►Sometimes does art photography
►Physics PhD
►Data, Health, & Computer science
►Python coder, (co)founder of scikit-learn, joblib, & @probabl.bsky.social
►Sometimes does art photography
►Physics PhD
Finally did it! A glitter @scikit-learn.org sticker on my bike helmet.
If you're around Saclay, Massy, ... and you see me go by on my bike, go ahead and cheer!
If you're around Saclay, Massy, ... and you see me go by on my bike, go ahead and cheer!
January 4, 2026 at 8:21 PM
Finally did it! A glitter @scikit-learn.org sticker on my bike helmet.
If you're around Saclay, Massy, ... and you see me go by on my bike, go ahead and cheer!
If you're around Saclay, Massy, ... and you see me go by on my bike, go ahead and cheer!
Finally did it! A glitter @scikit-learn.org -learn sticker on my bike helmet.
If you're around Saclay, Massy, ... and you see me go by on my bike, go ahead and cheer!
If you're around Saclay, Massy, ... and you see me go by on my bike, go ahead and cheer!
January 4, 2026 at 8:21 PM
Finally did it! A glitter @scikit-learn.org -learn sticker on my bike helmet.
If you're around Saclay, Massy, ... and you see me go by on my bike, go ahead and cheer!
If you're around Saclay, Massy, ... and you see me go by on my bike, go ahead and cheer!
Reposted by Gaël Varoquaux
Si vous vous demandez ce que vous, oui VOUS, pouvez faire à votre niveau quand les USA deviennent une menace pour le monde entier : virer Windows/Mac, les services Google, Amazon. Ne plus *dépendre* d'eux.
January 3, 2026 at 10:49 AM
Si vous vous demandez ce que vous, oui VOUS, pouvez faire à votre niveau quand les USA deviennent une menace pour le monde entier : virer Windows/Mac, les services Google, Amazon. Ne plus *dépendre* d'eux.
The US are rapidly becoming a fascist state (I weigh my words).
The speed of this transformation should be a warning to all of us, not only those living in the US.
Democracy, functioning societies, are fragile. Living without them is hell.
The speed of this transformation should be a warning to all of us, not only those living in the US.
Democracy, functioning societies, are fragile. Living without them is hell.
Retired immigration judge to @radleybalko.bsky.social: "It always starts with the minorities. It always starts with the immigrants. If we don’t stop them, it will be American citizens. We need to be screaming that this isn’t America—that this isn’t who we are" newrepublic.com/article/2042...
Trump’s Immigration Nightmare: It Is Happening Here
With astonishing speed, the administration has toppled the most cherished pillars of a free society. And the experts agree: It’s all going to get much, much worse.
newrepublic.com
January 2, 2026 at 10:48 PM
The US are rapidly becoming a fascist state (I weigh my words).
The speed of this transformation should be a warning to all of us, not only those living in the US.
Democracy, functioning societies, are fragile. Living without them is hell.
The speed of this transformation should be a warning to all of us, not only those living in the US.
Democracy, functioning societies, are fragile. Living without them is hell.
My 2025 highlights for AI research and code:
▪ Unpacking the AI scale narrative
▪ Tabular-learning research
- TabICL: table foundation model
- Retrieve merge predict: data lakes
▪ Better software
- Skrub: machine learning with tables
- Fundamentals in scikit-learn
gael-varoquaux.info/science/2025...
▪ Unpacking the AI scale narrative
▪ Tabular-learning research
- TabICL: table foundation model
- Retrieve merge predict: data lakes
▪ Better software
- Skrub: machine learning with tables
- Fundamentals in scikit-learn
gael-varoquaux.info/science/2025...
2025 highlights: AI research and code
AI is everywhere. Can you see it here? Note Some highlights about my work in 2025: progress on tabular-learning stands out, a publication on unpacking trade-off and consequences of scale in...
gael-varoquaux.info
January 2, 2026 at 1:45 PM
My 2025 highlights for AI research and code:
▪ Unpacking the AI scale narrative
▪ Tabular-learning research
- TabICL: table foundation model
- Retrieve merge predict: data lakes
▪ Better software
- Skrub: machine learning with tables
- Fundamentals in scikit-learn
gael-varoquaux.info/science/2025...
▪ Unpacking the AI scale narrative
▪ Tabular-learning research
- TabICL: table foundation model
- Retrieve merge predict: data lakes
▪ Better software
- Skrub: machine learning with tables
- Fundamentals in scikit-learn
gael-varoquaux.info/science/2025...
Dusk falls on the Eiffel tower - Paris
This shot was taken from the @probabl.ai offices, on the 27th floor of the "Tour Montparnasse", the only high-riser of inner Paris
Click through for details and highres image
www.flickr.com/photos/gaelv...
This shot was taken from the @probabl.ai offices, on the 27th floor of the "Tour Montparnasse", the only high-riser of inner Paris
Click through for details and highres image
www.flickr.com/photos/gaelv...
Dusk falls on the Eiffel tower - Paris
This shot was taken from the :Probabl. offices, on the 27th floor of the "Tour Montparnasse", the only high-riser of inner Paris. The view is that of the Eiffel tower, and far behind it the business d...
www.flickr.com
December 30, 2025 at 5:43 PM
Dusk falls on the Eiffel tower - Paris
This shot was taken from the @probabl.ai offices, on the 27th floor of the "Tour Montparnasse", the only high-riser of inner Paris
Click through for details and highres image
www.flickr.com/photos/gaelv...
This shot was taken from the @probabl.ai offices, on the 27th floor of the "Tour Montparnasse", the only high-riser of inner Paris
Click through for details and highres image
www.flickr.com/photos/gaelv...
Hi everyone,
If you like @scikit-learn.org, how about upvoting my request to add it to the LinuxFoundation insight board:
github.com/linuxfoundat...
Thanks 🧡💙
If you like @scikit-learn.org, how about upvoting my request to add it to the LinuxFoundation insight board:
github.com/linuxfoundat...
Thanks 🧡💙
Add scikit-learn · linuxfoundation insights · Discussion #1506
We'd like to request enrolling scikit-learn into LFX Insights. The GitHub org is https://github.com/scikit-learn/scikit-learn. Scikit-learn is the most used machine learning library: download numbe...
github.com
December 28, 2025 at 9:40 PM
Hi everyone,
If you like @scikit-learn.org, how about upvoting my request to add it to the LinuxFoundation insight board:
github.com/linuxfoundat...
Thanks 🧡💙
If you like @scikit-learn.org, how about upvoting my request to add it to the LinuxFoundation insight board:
github.com/linuxfoundat...
Thanks 🧡💙
Reposted by Gaël Varoquaux
In case you need a positive reminder:
How effective is protesting? According to historians and political scientists: very www.theguardian.com/us-news/2025...
How effective is protesting? According to historians and political scientists: very www.theguardian.com/us-news/2025...
How effective is protesting? According to historians and political scientists: very
From emancipation to women’s suffrage, civil rights and BLM, mass movement has shaped the arc of US history
www.theguardian.com
December 26, 2025 at 2:51 AM
In case you need a positive reminder:
How effective is protesting? According to historians and political scientists: very www.theguardian.com/us-news/2025...
How effective is protesting? According to historians and political scientists: very www.theguardian.com/us-news/2025...
Morning ski
A picture of an early-morning ski-touring run. I liked the shape drawn in the sky by the clouds
flickr.com/photos/gaelv...
Click through for high-res 👆
A picture of an early-morning ski-touring run. I liked the shape drawn in the sky by the clouds
flickr.com/photos/gaelv...
Click through for high-res 👆
December 25, 2025 at 6:07 PM
Morning ski
A picture of an early-morning ski-touring run. I liked the shape drawn in the sky by the clouds
flickr.com/photos/gaelv...
Click through for high-res 👆
A picture of an early-morning ski-touring run. I liked the shape drawn in the sky by the clouds
flickr.com/photos/gaelv...
Click through for high-res 👆
Reposted by Gaël Varoquaux
Vendredi 12 décembre, à la salle du Mont-Blanc, nous avons lancé notre campagne municipale à Antony ❤
Une soirée chaleureuse et engagée autour d’une liste de coalition menée par David Mauger, portée par l’énergie collective d’Antony Terre Citoyenne
🙏 Un grand MERCI à toutes et tous d'être venu.e.s
Une soirée chaleureuse et engagée autour d’une liste de coalition menée par David Mauger, portée par l’énergie collective d’Antony Terre Citoyenne
🙏 Un grand MERCI à toutes et tous d'être venu.e.s
December 18, 2025 at 5:49 PM
Vendredi 12 décembre, à la salle du Mont-Blanc, nous avons lancé notre campagne municipale à Antony ❤
Une soirée chaleureuse et engagée autour d’une liste de coalition menée par David Mauger, portée par l’énergie collective d’Antony Terre Citoyenne
🙏 Un grand MERCI à toutes et tous d'être venu.e.s
Une soirée chaleureuse et engagée autour d’une liste de coalition menée par David Mauger, portée par l’énergie collective d’Antony Terre Citoyenne
🙏 Un grand MERCI à toutes et tous d'être venu.e.s
Reposted by Gaël Varoquaux
Let's kick off 2026 with a workshop on Survival Analysis and Foundation Models, co-organized w. Julie Alberge Linus Bleistein Clément Berenfeld Agathe Guilloux and Julie Josse on January 27th at PariSanté Campus !
Registrations and submissions are open!!! www.linusbleistein.com/ramh
Registrations and submissions are open!!! www.linusbleistein.com/ramh
LinkedIn
This link will take you to a page that’s not on LinkedIn
lnkd.in
December 15, 2025 at 9:25 PM
Let's kick off 2026 with a workshop on Survival Analysis and Foundation Models, co-organized w. Julie Alberge Linus Bleistein Clément Berenfeld Agathe Guilloux and Julie Josse on January 27th at PariSanté Campus !
Registrations and submissions are open!!! www.linusbleistein.com/ramh
Registrations and submissions are open!!! www.linusbleistein.com/ramh
Reposted by Gaël Varoquaux
Over the last few months the @scikit-learn.org has been spending extra time on improving the open-source supply chain. My take away: don't stray too far from the standard and boring path when setting up CI. Too many ways of getting hacked. Thanks to @github.com blog.scikit-learn.org/press/gh-sosf/
scikit-learn Completes the GitHub Secure Open Source Training
Author: Reshama Shaikh
blog.scikit-learn.org
December 10, 2025 at 7:46 AM
Over the last few months the @scikit-learn.org has been spending extra time on improving the open-source supply chain. My take away: don't stray too far from the standard and boring path when setting up CI. Too many ways of getting hacked. Thanks to @github.com blog.scikit-learn.org/press/gh-sosf/
If someone with communication and/or influence training wants to help me out, I'm writing a piece on a conflict on which I would like not to make image-related mistakes.
Do reach out. Thanks!
Do reach out. Thanks!
December 14, 2025 at 2:44 PM
If someone with communication and/or influence training wants to help me out, I'm writing a piece on a conflict on which I would like not to make image-related mistakes.
Do reach out. Thanks!
Do reach out. Thanks!
Reposted by Gaël Varoquaux
Our guidance regarding performance measures for medical AI models is finally out!
- Stop bashing AUROC, although it does not settle things
- Calibration and clinical utility are key
- Show risk distributions
- Classification statistics (e.g. F1) are improper
www.thelancet.com/journals/lan...
- Stop bashing AUROC, although it does not settle things
- Calibration and clinical utility are key
- Show risk distributions
- Classification statistics (e.g. F1) are improper
www.thelancet.com/journals/lan...
Evaluation of performance measures in predictive artificial intelligence models to support medical decisions: overview and guidance
Numerous measures have been proposed to illustrate the performance of predictive artificial
intelligence (AI) models. Selecting appropriate performance measures is essential
for predictive AI models i...
www.thelancet.com
December 13, 2025 at 2:04 PM
Our guidance regarding performance measures for medical AI models is finally out!
- Stop bashing AUROC, although it does not settle things
- Calibration and clinical utility are key
- Show risk distributions
- Classification statistics (e.g. F1) are improper
www.thelancet.com/journals/lan...
- Stop bashing AUROC, although it does not settle things
- Calibration and clinical utility are key
- Show risk distributions
- Classification statistics (e.g. F1) are improper
www.thelancet.com/journals/lan...
Reposted by Gaël Varoquaux
A new version of scikit-learn has been released 🥳 check out the highlights: scikit-learn.org/stable/auto_...
Thanks everyone who contributed to this release!
Let me know what you think of the experimental GPU support
Thanks everyone who contributed to this release!
Let me know what you think of the experimental GPU support
Release Highlights for scikit-learn 1.8
We are pleased to announce the release of scikit-learn 1.8! Many bug fixes and improvements were added, as well as some key new features. Below we detail the highlights of this release. For an exha...
scikit-learn.org
December 11, 2025 at 9:18 AM
A new version of scikit-learn has been released 🥳 check out the highlights: scikit-learn.org/stable/auto_...
Thanks everyone who contributed to this release!
Let me know what you think of the experimental GPU support
Thanks everyone who contributed to this release!
Let me know what you think of the experimental GPU support
Returning from #EurIPS via a long-distance night bus rather than airplane for carbon footprint reason.
I think it is important that even senior researchers change our behavior: practices of the elite pull consumption up, asxour reaction to opportunities set norms.
PS: I do find it painful 😄
I think it is important that even senior researchers change our behavior: practices of the elite pull consumption up, asxour reaction to opportunities set norms.
PS: I do find it painful 😄
December 7, 2025 at 8:35 PM
Returning from #EurIPS via a long-distance night bus rather than airplane for carbon footprint reason.
I think it is important that even senior researchers change our behavior: practices of the elite pull consumption up, asxour reaction to opportunities set norms.
PS: I do find it painful 😄
I think it is important that even senior researchers change our behavior: practices of the elite pull consumption up, asxour reaction to opportunities set norms.
PS: I do find it painful 😄
Reposted by Gaël Varoquaux
Our article on the societal challenges posed by Large Language Models is now available at SIGIR Forum: sigir.org/wp-content/u...
Thanks to Zacchary Sadeddine, Winston Maxwell and @gaelvaroquaux.bsky.social !
Thanks to Zacchary Sadeddine, Winston Maxwell and @gaelvaroquaux.bsky.social !
December 7, 2025 at 9:18 AM
Our article on the societal challenges posed by Large Language Models is now available at SIGIR Forum: sigir.org/wp-content/u...
Thanks to Zacchary Sadeddine, Winston Maxwell and @gaelvaroquaux.bsky.social !
Thanks to Zacchary Sadeddine, Winston Maxwell and @gaelvaroquaux.bsky.social !
Uncertainty in the LLM era - Science, more than scale
speakerdeck.com/gaelvaroquau...
My #EurIPS keynote, on scale, uncertainty, and narratives in AI
speakerdeck.com/gaelvaroquau...
My #EurIPS keynote, on scale, uncertainty, and narratives in AI
Uncertainty in the LLM era - Science, more than scale
Today's AI narrative is anchored in scale, and models are far from textbook statistical modeling. And yet, the plague that are hallucination shows us th…
speakerdeck.com
December 5, 2025 at 2:54 PM
Uncertainty in the LLM era - Science, more than scale
speakerdeck.com/gaelvaroquau...
My #EurIPS keynote, on scale, uncertainty, and narratives in AI
speakerdeck.com/gaelvaroquau...
My #EurIPS keynote, on scale, uncertainty, and narratives in AI
#EurIPS
Poster 81: what huge graph embedding for feature learning taught us
Failed to print the poster, but happy to talk. If you bring me paper and sharpies, will draw 😄
eurips.cc/conference/p...
Poster 81: what huge graph embedding for feature learning taught us
Failed to print the poster, but happy to talk. If you bring me paper and sharpies, will draw 😄
eurips.cc/conference/p...
December 4, 2025 at 8:51 AM
#EurIPS
Poster 81: what huge graph embedding for feature learning taught us
Failed to print the poster, but happy to talk. If you bring me paper and sharpies, will draw 😄
eurips.cc/conference/p...
Poster 81: what huge graph embedding for feature learning taught us
Failed to print the poster, but happy to talk. If you bring me paper and sharpies, will draw 😄
eurips.cc/conference/p...
Reposted by Gaël Varoquaux
In her place, we are very excited to announce that @gaelvaroquaux.bsky.social will give a keynote! We look forward to seeing Gaël and all of our other keynotes in the coming week. Due to these last minute changes the keynote program has been updated: eurips.cc/conference/
December 1, 2025 at 10:12 AM
In her place, we are very excited to announce that @gaelvaroquaux.bsky.social will give a keynote! We look forward to seeing Gaël and all of our other keynotes in the coming week. Due to these last minute changes the keynote program has been updated: eurips.cc/conference/
✨ #NeurIPS2025 paper: Scalable Feature Learning on Huge Knowledge Graphs for Downstream Machine Learning
Combining contrastive learning and message passing markedly improves features created from embedding graphs, scalable to huge graphs.
It taught us a lot on graph feature learning 👇
1/10
Combining contrastive learning and message passing markedly improves features created from embedding graphs, scalable to huge graphs.
It taught us a lot on graph feature learning 👇
1/10
November 28, 2025 at 3:46 PM
✨ #NeurIPS2025 paper: Scalable Feature Learning on Huge Knowledge Graphs for Downstream Machine Learning
Combining contrastive learning and message passing markedly improves features created from embedding graphs, scalable to huge graphs.
It taught us a lot on graph feature learning 👇
1/10
Combining contrastive learning and message passing markedly improves features created from embedding graphs, scalable to huge graphs.
It taught us a lot on graph feature learning 👇
1/10
Yesterday, I did 2 AI conferences in Paris; different kind of vibes.
AdoptAI, a business show: pretty videos, promises about AI, 2.30€ coffee
NeurIPS@Paris, a research conference: equations, free coffee
AI business wouldn't exist without research. Let's not forget it and keep investing in research
AdoptAI, a business show: pretty videos, promises about AI, 2.30€ coffee
NeurIPS@Paris, a research conference: equations, free coffee
AI business wouldn't exist without research. Let's not forget it and keep investing in research
November 27, 2025 at 8:06 PM
Yesterday, I did 2 AI conferences in Paris; different kind of vibes.
AdoptAI, a business show: pretty videos, promises about AI, 2.30€ coffee
NeurIPS@Paris, a research conference: equations, free coffee
AI business wouldn't exist without research. Let's not forget it and keep investing in research
AdoptAI, a business show: pretty videos, promises about AI, 2.30€ coffee
NeurIPS@Paris, a research conference: equations, free coffee
AI business wouldn't exist without research. Let's not forget it and keep investing in research
Reposted by Gaël Varoquaux
How much is your company spending to support the Python Software Foundation?
For comparison, how much do they spend for tips on expensed meals?
The PSF runs PyPI, where pip installs from. You depend on PyPI.
Fund the PSF. Tip your server!
www.python.org/psf/sponsors...
For comparison, how much do they spend for tips on expensed meals?
The PSF runs PyPI, where pip installs from. You depend on PyPI.
Fund the PSF. Tip your server!
www.python.org/psf/sponsors...
Sponsor the PSF
The official home of the Python Programming Language
www.python.org
November 18, 2025 at 11:59 PM
How much is your company spending to support the Python Software Foundation?
For comparison, how much do they spend for tips on expensed meals?
The PSF runs PyPI, where pip installs from. You depend on PyPI.
Fund the PSF. Tip your server!
www.python.org/psf/sponsors...
For comparison, how much do they spend for tips on expensed meals?
The PSF runs PyPI, where pip installs from. You depend on PyPI.
Fund the PSF. Tip your server!
www.python.org/psf/sponsors...
@skrub-data.bsky.social: better data-science primitives for clean code on dataframes
Watch my dotAI talk, it's fun (live coding)!
www.youtube.com/watch?v=bQS4...
skrub really makes it easy to do machine learning with dataframes
Watch my dotAI talk, it's fun (live coding)!
www.youtube.com/watch?v=bQS4...
skrub really makes it easy to do machine learning with dataframes
Clean code in Data Science - Gael Varoquaux - Skrub DataOps, Probabl:
YouTube video by dotconferences
www.youtube.com
November 17, 2025 at 5:07 PM
@skrub-data.bsky.social: better data-science primitives for clean code on dataframes
Watch my dotAI talk, it's fun (live coding)!
www.youtube.com/watch?v=bQS4...
skrub really makes it easy to do machine learning with dataframes
Watch my dotAI talk, it's fun (live coding)!
www.youtube.com/watch?v=bQS4...
skrub really makes it easy to do machine learning with dataframes