Stefan Sommer Profile
Stefan Sommer

@stefanhsommer

Followers
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396

Professor, Computer Science, University of Copenhagen

Copenhagen
Joined July 2013
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@stefanhsommer
Stefan Sommer
2 years
Hyperiax: Tree traversals using JAX https://t.co/Mo3ROHZrDH Developed by the team at @CCEM_ucph, initially for applications in phylogenetic analysis of morphological data, but Hyperiax has evolved into a general tree traversal, message passing and edge/node computation framework.
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@stefanhsommer
Stefan Sommer
3 months
Neural Guided Diffusion Bridges https://t.co/c7Btf0PmiC w/ @gefanyang @MeulenFrank We introduce a new bridge simulation method that combines the guided proposals of @MeulenFrank and @MoritzSchauer with an additional correction drift term parametrized by a learnable neural
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@stefanhsommer
Stefan Sommer
4 months
New version of our paper on parallel transport on matrix manifolds https://t.co/zMpb1CDhpz , to appear in SIMAX
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arxiv.org
We express parallel transport for several common matrix Lie groups with a family of pseudo-Riemannian metrics in terms of matrix exponential and exponential actions. The metrics are constructed...
@stefanhsommer
Stefan Sommer
1 year
Du @th_trad and I have a new preprint on arxiv: Parallel transport on matrix manifolds and Exponential Action https://t.co/zMpb1CDhpz
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@stefanhsommer
Stefan Sommer
4 months
Score Matching Riemannian Diffusion Means https://t.co/TKpTYvYKfd Score matching is applicable for learning the reverse dynamics of diffusion processes, for bridges etc., but also for fast computation of means on manifolds. By learning the score of the Riemannian Brownian motion,
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@stefanhsommer
Stefan Sommer
8 months
Open phd-positions in my group, including computer vision for detection and segmentation in plant images
candidate.hr-manager.net
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@gabrielpeyre
Gabriel Peyré
11 months
The space of compact sets in a metric space is a compact set for the Hausdorff metric. Hausdorff convergence is weak and does not preserve topology, dimension, length, or path-connectedness. It preserves connectedness and convexity. https://t.co/xZd3IUcnpO
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@stefanhsommer
Stefan Sommer
11 months
I'll be hiring PhDs and postdocs in 2025 (and beyond) for two new research projects, MorphAI and DIGIFABA (at UCPH, funded by @novonordiskfond ) If you have a solid background in math/stats/cs (logical or, but depth is required), wish to join a growing research group in
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@gabrielpeyre
Gabriel Peyré
1 year
The gradient field defines the steepest descent direction. The gradient flow dynamic defines a segmentation of the space into attraction basins of the local minimizers. https://t.co/qhnj2rCxn9 https://t.co/MtAm8oH0RK
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@iavins
v
1 year
Collection of insane and fun facts about SQLite. Let's go! SQLite is the most deployed and most used database. There are over one trillion (1000000000000 or a million million) SQLite databases in active use. It is maintained by three people. They don't allow outside
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@RasmusPagh1
Rasmus Pagh
1 year
Interested in a post-doc position in theoretical computer science? Want to find out why they call it "Wonderful Copenhagen"? Look here! Application deadline January 10. Hiring in multiple areas including geometry, complexity, learning, and privacy. https://t.co/XQFeZOzbKK
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@gabrielpeyre
Gabriel Peyré
1 year
Gradient descent on particles’ positions (Lagrangian) is equivalent to an advection linear PDE on the density of particles (Eulerian). https://t.co/lHYMjNg6P1
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@ELLISforEurope
ELLIS
1 year
Check out the ELLIS Pre-NeurIPS Fest event today in... 🇩🇰 Copenhagen! ELLIS Unit Copenhagen @elliscph is holding their event at @AiCentreDK showcasing #NeurIPS posters and other Denmark-affiliated papers in #AI and #ML. More info:
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@mmbronstein
Michael Bronstein
1 year
Intervista con mio fratello @Alex__Bronstein riguarda l'episodio obbrobrioso a Cagliari. Il silenzio dell @univca ufficiale e' pure una vergogna. https://t.co/ePbCb0hHYc
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cagliaritoday.it
Parla Alex Bronstein, il professore israeliano (e sardo d’adozione) preso di mira all’Università di Cagliari, dove tiene un corso informatico: "Sono aperto al confronto"
@UnioneSarda
L'Unione Sarda
1 year
«Fuori i sionisti dall’Università di Cagliari»: protesta contro il docente israeliano Alex Bronstein
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@SwipeWright
Colin Wright
1 year
The president of the National Academy of Sciences, Marcia McNutt, has published welcome an essay promising to remain politically neutral and mitigate the political polarization of science. Some notable quotes from the article: "[S]cientists need to better explain the norms and
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@MoritzSchauer
Moritz Schauer
1 year
Shape evolution…. We knew it @stefanhsommer
@xkcd
Randall Munroe
1 year
Geometriphylogenetics https://t.co/9h9Z65RmSK
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@gabrielpeyre
Gabriel Peyré
1 year
Kalman filter defines recursively an estimator of the parameters of a Gaussian dynamical process. The basic method to control navigation systems. https://t.co/Bnv9YNG4pL
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@ninamiolane
Nina Miolane 🦋 @ninamiolane.bsky.social
1 year
I am recruiting PhD students for 2025!😃 You want to reveal the geometric signatures of natural and artificial intelligence, and unlock the mysteries of the brain?🤖🧠 Apply to the UCSB Geometric Intelligence Lab✨ This is the view you'd have from... well, your desk🌴
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@BelongieLab
Belongie Lab
1 year
Looking forward to this seminar by @trevordarrell @berkeley_ai next week!
@AiCentreDK
Pioneer Centre for AI
1 year
On Wednesday, 30 October, Professor @trevordarrell from @Berkeley_EECS will give a talk in Copenhagen. 📍🇩🇰 Don't miss the opportunity to gain valuable insights into Professor Darrell's work. 👉 Sign up and find more information on our website: https://t.co/ntr71cgtNA
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@gabrielpeyre
Gabriel Peyré
1 year
Oldies but goldies: Sathamangalam Srinivasa Varadhan, On the behavior of the fundamental solution of the heat equation with variable coefficients, 1967. Shows that the heat kernel on a manifold is approximately a geodesic Gaussian kernel for a small time. https://t.co/6GXNtW1qkA
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@mathPRb
arXiv math.PR Probability
1 year
Thorben Pieper-Sethmacher, Frank van der Meulen, Aad van der Vaart: On a class of exponential changes of measure for stochastic PDEs https://t.co/zer93u1Eeo
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@raghavian
Raghav{endra}| ರಾಘವೇಂದ್ರ
1 year
Super excited to be teaching (1/3rd) the Advanced Topics in #DeepLearning course with @stefanhsommer, and two other teachers, with a focus on graph neural networks. Emergency alarm went off in the building after my first slide. That must be a good omen. No? 😅
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