@dePolavieja profile picture
Gonzalo de Polavieja @dePolavieja

Principal Investigator @Neuro_CF, co-founder @AlgebraicAI.

Joined May 2010
  • Tweets 2,353
  • Following 1,189
  • Followers 1,951
123 Photos and videos
Gonzalo de Polavieja retweeted
Mario Zechner
@badlogicgames
May 31
recommended reading. > On that last point, this technology is horrific for attention thoughts.hmmz.org/2026-05-31…

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Gonzalo de Polavieja retweeted
Didier 'Dirac's ghost' Gaulin
@DiracGhost
May 30
arxiv.org/abs/1709.08492

A pictorial introduction to differential geometry, leading to...

In this article we present pictorially the foundation of differential geometry which is a crucial tool for multiple areas of physics, notably general and special relativity, but also mechanics,...

arxiv.org
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Gonzalo de Polavieja retweeted
Steven Brunton
@eigensteve
May 15
I Wrote a New Book!!! Optimization: A Bootcamp for Machine Learning, Inverse Problems, and Control Pre-Order Now (July 31) amazon.com/Optimization-Boot… Coming Soon: * Free PDF on website * YouTube Videos for entire book * Python code on GitHub
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Gonzalo de Polavieja retweeted
Machine Learning (ML) Papers@Memoirs
May 5
Beyond ECE: Calibrated Size Ratio, Risk Assessment, and Confidence-Weighted Metrics Fernando Martin-Maroto, Nabil Abderrahaman, Gonzalo G. de Polavieja arxiv.org/abs/2605.01796 [𝚌𝚜.𝙻𝙶 𝚖𝚊𝚝𝚑.𝚂𝚃]
Confidence calibration has been dominated by the Expected Calibration Error (ECE), a linear metric that counts calibration offset equally regardless of the confidence level at which it occurs. We show that ECE can remain small even under arbitrarily large overconfidence risk, so we propose Calibrated Size Ratio (CSR) instead, an interpretable metric that equals 1 under perfect calibration, from which we derive the risk probability Pᵣᵢₛₖ that quantifies the statistical evidence for overconfidence. We further argue that overconfidence risk assessment must be complemented by a measure of discriminative value: whether the assigned confidences actively distinguish correct from incorrect predictions. We show that confidence-weighted accuracy cwA is the natural such complement, and that confidence-weighting extends to all standard classification metrics. In particular, we prove that the confidence-weighted AUC (cwAUC) captures the information about calibration while the classical AUC cannot.

ALT Confidence calibration has been dominated by the Expected Calibration Error (ECE), a linear metric that counts calibration offset equally regardless of the confidence level at which it occurs. We show that ECE can remain small even under arbitrarily large overconfidence risk, so we propose Calibrated Size Ratio (CSR) instead, an interpretable metric that equals 1 under perfect calibration, from which we derive the risk probability Pᵣᵢₛₖ that quantifies the statistical evidence for overconfidence. We further argue that overconfidence risk assessment must be complemented by a measure of discriminative value: whether the assigned confidences actively distinguish correct from incorrect predictions. We show that confidence-weighted accuracy cwA is the natural such complement, and that confidence-weighting extends to all standard classification metrics. In particular, we prove that the confidence-weighted AUC (cwAUC) captures the information about calibration while the classical AUC cannot.

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Gonzalo de Polavieja retweeted
Liset M de la Prida@LMPrida
Jan 7
The new Cajal Center is opening 8 CSIC permanent research positions (CT, IC & PF levels) via national competitive exams. We welcome candidates eager to shape an ambitious 🧠 research hub in Spain. 🔗 sede.csic.gob.es/tramites/co… 📣 #Neuroscience #CNC #CSIC #ScienceJobs 👇🏼

Convocatorias de personal o empleo público

sede.csic.gob.es
Centro de Neurociencias Cajal - CSIC@CNCajal_CSIC
Jan 7
COME AND JOIN US‼️ ** TENURED SCIENTIFIC POSITIONS OPENED** • Brain recovery & neuropathology • Synaptic & computational mechanisms • AI & computational neuroscience • Bioinformatics / Data Science / AI in Biomedicine 📅 Apply by Jan 30, 2026 👉shorturl.at/vXCEW [BOE]
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Call is out for Champalimaud International Neuroscience Doctoral Programme 2026! docs.google.com/forms/d/e/1F…
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We’re seeking talented students from all over the world, and from a range of different backgrounds – from life sciences to physics, from mathematics to computer science – to work at the frontiers of knowledge in a supportive, inclusive, and collaborative environment.
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Gonzalo de Polavieja retweeted
arXiv math.RA Rings and Algebras@mathRAb
4 Nov 2025
Maroto, et al.: The pairwise distributive law of semilattice congruences arxiv.org/abs/2511.00892 arxiv.org/pdf/2511.00892 arxiv.org/html/2511.00892

The pairwise distributive law of semilattice congruences

We show that the congruence lattice of a semilattice satsifies a form of distributivity relative to principal congruences of the form $ Θ_{t \odot s, s}$. Particularly, we establish that...

arxiv.org
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Gonzalo de Polavieja retweeted
Emily Riehl@emilyriehl
18 Aug 2025
Kudos to Terry Tao for this: newsletter.ofthebrave.org/p/…

I’m an award-winning mathematician. Trump just cut my funding.

The “Mozart of Math” tried to stay out of politics. Then it came for his research.

newsletter.ofthebrave.org
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Gonzalo de Polavieja retweeted
biorxiv_behav@biorxiv_behav
2 Jun 2025
New idtracker.ai: rethinking multi-animal tracking as a representation learning problem to increase accuracy and reduce tracking times biorxiv.org/content/10.1101/… #biorxiv_behav
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Gonzalo de Polavieja retweeted
Jay Cummings
@LongFormMath
22 Apr 2025
🧵 My 3rd book is now out! It is on the fascinating history of math. How did people throughout history think about math?What problems did they care about? How did they express them? How were they solved? This book includes a lot of historical math. a.co/d/gsoNKxP

Math History: A Long-Form Mathematics Textbook

Math History: A Long-Form Mathematics Textbook (The Long-Form Math Textbook Series)

amazon.com
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Gonzalo de Polavieja retweeted
antisense.@razoralign
23 Feb 2025
C.La.P.: Enhancing transformer-based genomic signal modeling by integrating DNA sequences and chromatin accessibility data biorxiv.org/content/10.1101/…
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Gonzalo de Polavieja retweeted
Centre for the Adv Study of Collective Behaviour@CBehav
3 Feb 2025
The Konstanz school of collective behaviour is back! We look forward to welcoming everyone to Konstanz this summer Check out the amazing lineup!
Ahmed El Hady
@zamakany
3 Feb 2025
Plz share around : The tradition continues, the Konstanz School of Collective Behavior will take place from July 21st to August 8th , 2025. Application deadline: April 15 ( exc.uni-konstanz.de/kscb/app… ) . We have an amazing line up of speakers covering all aspects of collective behavior across a variety of systems ( more faculty to be added) : Iain Couzin ( Max Planck Institute of Animal Behavior , Konstanz) @icouzin Peter Dayan ( Max Planck Institute of Biological Cybernetics, Tübingen) @MPICybernetics Ilya  Nemenman ( Emory University , USA) @INemenman Yonatan Loewenstein ( Hebrew University of Jerusalem, Israel) @ELSCbrain Aneta Koseska ( Max Planck Institute of Neurobiology of Behavior, Bonn) @KoseskaL Francesco Ginelli ( Università degli Studi dell'Insubria, Italy) Thejasvi Ravindra  Beleyur ( Max Planck Institute of Animal Behavior, Konstanz) @BeleyurThejasvi Liang Li ( Max Planck Institute of Animal Behavior, Konstanz) Giovanni Reinna ( University of Konstanz, Konstanz) @joefresna Einat Couzin-Fuchs ( University of Konstanz, Konstanz ) @einatcouzin Ofer Feinermann ( Weizmann Institute of Sciences, Israel) @WeizmannScience Naama Brenner ( Israel Institute of Technology, Israel) @TechnionLive Ariana Strandburg-Peshkin ( Max Planck Institute of Animal Behavior , Konstanz) @ariSPeshkin Wataru Toyokawa (Riken Center for Brain Science in Tokyo). @WataruToyokawa Raphaela Heesen ( University of Konstanz, Konstanz) Caroline Schuppli ( Max Planck Institute of Animal Behavior , Konstanz) @carolschuppli Michael Chimento ( University of Konstanz, Konstanz) @evogom @CBehav @MPI_animalbehav @UniKonstanz
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Deadline approaching (31st Jan)
Il Memming Park@memming
28 Dec 2024
Looking for the best systems #neuroscience #phd program? Champalimaud Centre for the Unknown has one! #PhDposition = fully funded. US-style lab rotations and an awesome community in Lisbon, Portugal. Apply by the end of Jan, 2025.
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Gonzalo de Polavieja retweeted
ChampalimaudF@ChampalimaudF
7 Jan 2025
👀 Trabalham em metodologias inovadoras de IA? O Alternative Mathematical Approaches in AI Meeting (ALTAI2025) convida matemáticos, cientistas da computação e neurocientistas, para discutir este tópico. 🗓️ 3 - 4 Fev 📍 @Neuro_CF 👉 Deadline: 17 Jan 🎟️ sites.google.com/view/altai2…
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Gonzalo de Polavieja retweeted
ChampalimaudResearch@Neuro_CF
7 Jan 2025
👀 Are you working on innovative AI methodologies? The Alternative Mathematical Approaches in AI Meeting (ALTAI2025) invites mathematicians, computer scientists and neuroscientists to discuss this topic. 🗓️ 3 - 4 Feb 📍@Neuro_CF 👉 Deadline: 17 Jan 🎟️ sites.google.com/view/altai2…
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Gonzalo de Polavieja retweeted
Il Memming Park@memming
28 Dec 2024
Looking for the best systems #neuroscience #phd program? Champalimaud Centre for the Unknown has one! #PhDposition = fully funded. US-style lab rotations and an awesome community in Lisbon, Portugal. Apply by the end of Jan, 2025.
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ChampalimaudF@ChampalimaudF
12 Dec 2024
Replying to @ChampalimaudF
👀Applications to the INDP at @ChampalimaudF are open until 31 Jan 2025. 👉 Apply! bit.ly/4iB9SwP 💡 INDP provides integrative, state-of-the-art education, while fostering inquiry and discovery by encouraging active participation and critical thinking. @itqbnova @UAlg
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Gonzalo de Polavieja retweeted
Ben Lang
@benz145
22 Dec 2024
Very cool (and almost *frustrating*) optical illusion. If you pause this video at any time, the shapes disappear. They exist *only* temporally, not visually. This is from Branta Games on YouTube (full video linked below)
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Sign up to come to the Alternative Mathematics for AI Meeting, sites.google.com/view/altai2…

ALTAI25

Join us to explore the mathematical foundations of artificial intelligence

sites.google.com
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Last day to apply!!!: postdoctoral position available with us and David Rios (davidriosinsua.es at ICMAT, bsky.app/profile/icma...) on collective behavior and frontier AI techniques, more info and application: aihub.csic.es/en/allies-co...
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