Ronny Bergmann
@ronnybergmann.net
Optimisation, Riemannian manifolds, and numerics in Julia (Manifolds.jl, LieGroups.jl, Manopt.jl). Working at the Department of Mathematical Sciences, NTNU, Trondheim, Norway.
Posts mostly in English, manchmal Deutsch eller Norsk.
Posts mostly in English, manchmal Deutsch eller Norsk.
Reposted by Ronny Bergmann
Even in the vast sea of voices that is the internet, Michi’s is one that definitely deserves being listened to. I couldn’t think of a better ambassador for inclusivity in human space travel.
Be sure to find her online on Insta at @michi_benthaus
Clip 2 of 2:
Be sure to find her online on Insta at @michi_benthaus
Clip 2 of 2:
November 12, 2025 at 5:57 PM
Even in the vast sea of voices that is the internet, Michi’s is one that definitely deserves being listened to. I couldn’t think of a better ambassador for inclusivity in human space travel.
Be sure to find her online on Insta at @michi_benthaus
Clip 2 of 2:
Be sure to find her online on Insta at @michi_benthaus
Clip 2 of 2:
Reposted by Ronny Bergmann
Friends, this video is well worth your time. My friend Michi Benthaus, an ESA engineer who will very soon make history as the first wheelchair user to visit space, has recently given a speech in front of the European Parliament.
Clip 1 of 2:
Clip 1 of 2:
November 12, 2025 at 5:57 PM
Friends, this video is well worth your time. My friend Michi Benthaus, an ESA engineer who will very soon make history as the first wheelchair user to visit space, has recently given a speech in front of the European Parliament.
Clip 1 of 2:
Clip 1 of 2:
Reposted by Ronny Bergmann
I am on the job market and wanted to advertise myself here! 🤠
Looking for full-time or contracting roles!
Historically, my work spans population dynamics, healthcare informatics, robust adaptive controls, software engineering, and community engagement. 🧪
#STEMjobs #academicsky #publichealth
Looking for full-time or contracting roles!
Historically, my work spans population dynamics, healthcare informatics, robust adaptive controls, software engineering, and community engagement. 🧪
#STEMjobs #academicsky #publichealth
November 4, 2025 at 6:31 PM
I am on the job market and wanted to advertise myself here! 🤠
Looking for full-time or contracting roles!
Historically, my work spans population dynamics, healthcare informatics, robust adaptive controls, software engineering, and community engagement. 🧪
#STEMjobs #academicsky #publichealth
Looking for full-time or contracting roles!
Historically, my work spans population dynamics, healthcare informatics, robust adaptive controls, software engineering, and community engagement. 🧪
#STEMjobs #academicsky #publichealth
Reposted by Ronny Bergmann
Academics in Assyria in the 7th c BC complain that admin is preventing them from doing research and teaching
November 3, 2025 at 10:04 AM
Academics in Assyria in the 7th c BC complain that admin is preventing them from doing research and teaching
Reposted by Ronny Bergmann
Hajg Jasa, Ronny Bergmann, Christian K\"ummerle, Avanti Athreya, Zachary Lubberts: Procrustes Problems on Random Matrices https://arxiv.org/abs/2510.05182 https://arxiv.org/pdf/2510.05182 https://arxiv.org/html/2510.05182
October 8, 2025 at 6:53 AM
Hajg Jasa, Ronny Bergmann, Christian K\"ummerle, Avanti Athreya, Zachary Lubberts: Procrustes Problems on Random Matrices https://arxiv.org/abs/2510.05182 https://arxiv.org/pdf/2510.05182 https://arxiv.org/html/2510.05182
Reposted by Ronny Bergmann
Ich habe Sabbatical! #IchwarHanna
Da fiel mir auf, dass ich seit meinem dritten Semester, das sind bald 20 Jahre, jedes Semester bis jetzt Lehrverpflichtungen hatte,
mit Ausnahme eines halben Semesters, da sich Wintersemester (in D) und Frühjahrssemester (in Norw.) halb überschneiden.
Da fiel mir auf, dass ich seit meinem dritten Semester, das sind bald 20 Jahre, jedes Semester bis jetzt Lehrverpflichtungen hatte,
mit Ausnahme eines halben Semesters, da sich Wintersemester (in D) und Frühjahrssemester (in Norw.) halb überschneiden.
August 21, 2025 at 6:48 AM
Ich habe Sabbatical! #IchwarHanna
Da fiel mir auf, dass ich seit meinem dritten Semester, das sind bald 20 Jahre, jedes Semester bis jetzt Lehrverpflichtungen hatte,
mit Ausnahme eines halben Semesters, da sich Wintersemester (in D) und Frühjahrssemester (in Norw.) halb überschneiden.
Da fiel mir auf, dass ich seit meinem dritten Semester, das sind bald 20 Jahre, jedes Semester bis jetzt Lehrverpflichtungen hatte,
mit Ausnahme eines halben Semesters, da sich Wintersemester (in D) und Frühjahrssemester (in Norw.) halb überschneiden.
Reposted by Ronny Bergmann
Ronny Bergmann, Hajg Jasa, Paula John, Max Pfeffer: The Intrinsic Riemannian Proximal Gradient Method for Convex Optimization https://arxiv.org/abs/2507.16055 https://arxiv.org/pdf/2507.16055 https://arxiv.org/html/2507.16055
July 23, 2025 at 6:40 AM
Ronny Bergmann, Hajg Jasa, Paula John, Max Pfeffer: The Intrinsic Riemannian Proximal Gradient Method for Convex Optimization https://arxiv.org/abs/2507.16055 https://arxiv.org/pdf/2507.16055 https://arxiv.org/html/2507.16055
Reposted by Ronny Bergmann
Laura Weigl, Ronny Bergmann, Anton Schiela: Newton's method for nonlinear mappings into vector bundles Part II: Application to variational problems https://arxiv.org/abs/2507.13836 https://arxiv.org/pdf/2507.13836 https://arxiv.org/html/2507.13836
July 21, 2025 at 6:39 AM
Laura Weigl, Ronny Bergmann, Anton Schiela: Newton's method for nonlinear mappings into vector bundles Part II: Application to variational problems https://arxiv.org/abs/2507.13836 https://arxiv.org/pdf/2507.13836 https://arxiv.org/html/2507.13836
Reposted by Ronny Bergmann
Lukas Baumg\"artner, Ronny Bergmann, Roland Herzog, Stephan Schmidt, Manuel Wei{\ss}: Total Generalized Variation of the Normal Vector Field and Applications to Mesh Denoising https://arxiv.org/abs/2507.13530 https://arxiv.org/pdf/2507.13530 https://arxiv.org/html/2507.13530
July 21, 2025 at 6:30 AM
Lukas Baumg\"artner, Ronny Bergmann, Roland Herzog, Stephan Schmidt, Manuel Wei{\ss}: Total Generalized Variation of the Normal Vector Field and Applications to Mesh Denoising https://arxiv.org/abs/2507.13530 https://arxiv.org/pdf/2507.13530 https://arxiv.org/html/2507.13530
Yesterday I started a long travel day at 2:45 CEST that ended in a very nice evening chat at 21:30 EST.
While I am not so much jet lagged, my brain is a bit surprised about, that it is pitch black dark outside at 5:30.
Comparison photo from my travel start:
While I am not so much jet lagged, my brain is a bit surprised about, that it is pitch black dark outside at 5:30.
Comparison photo from my travel start:
July 22, 2025 at 9:23 AM
Yesterday I started a long travel day at 2:45 CEST that ended in a very nice evening chat at 21:30 EST.
While I am not so much jet lagged, my brain is a bit surprised about, that it is pitch black dark outside at 5:30.
Comparison photo from my travel start:
While I am not so much jet lagged, my brain is a bit surprised about, that it is pitch black dark outside at 5:30.
Comparison photo from my travel start:
From a great master thesis to an accepted conference talk at GSI: In this small paper we investigate how to compute the p-Laplacian on hyper graphs with manifold.valued data.
Jo Andersson Stokke, Ronny Bergmann, Martin Hanik, Christoph von Tycowicz: p-Laplacians for Manifold-valued Hypergraphs https://arxiv.org/abs/2507.10335 https://arxiv.org/pdf/2507.10335 https://arxiv.org/html/2507.10335
July 15, 2025 at 6:52 AM
From a great master thesis to an accepted conference talk at GSI: In this small paper we investigate how to compute the p-Laplacian on hyper graphs with manifold.valued data.
Reposted by Ronny Bergmann
Jo Andersson Stokke, Ronny Bergmann, Martin Hanik, Christoph von Tycowicz: p-Laplacians for Manifold-valued Hypergraphs https://arxiv.org/abs/2507.10335 https://arxiv.org/pdf/2507.10335 https://arxiv.org/html/2507.10335
July 15, 2025 at 6:37 AM
Jo Andersson Stokke, Ronny Bergmann, Martin Hanik, Christoph von Tycowicz: p-Laplacians for Manifold-valued Hypergraphs https://arxiv.org/abs/2507.10335 https://arxiv.org/pdf/2507.10335 https://arxiv.org/html/2507.10335
Reposted by Ronny Bergmann
On Manifolds, the gradient depends on the Riemannian metric, the differential does not. For a costly metric, using the gradient for the differential might be costly.
Manopt.jl 0.5.19 now offers first order objectives with dedicated implementations of differentials:
manoptjl.org/stable/plans...
Manopt.jl 0.5.19 now offers first order objectives with dedicated implementations of differentials:
manoptjl.org/stable/plans...
Objective · Manopt.jl
Documentation for Manopt.jl.
manoptjl.org
July 4, 2025 at 5:51 PM
On Manifolds, the gradient depends on the Riemannian metric, the differential does not. For a costly metric, using the gradient for the differential might be costly.
Manopt.jl 0.5.19 now offers first order objectives with dedicated implementations of differentials:
manoptjl.org/stable/plans...
Manopt.jl 0.5.19 now offers first order objectives with dedicated implementations of differentials:
manoptjl.org/stable/plans...
Es ist 23:08, eine halbe Stunde vor Sonnenuntergang an St. Hans. Allen einen schönen Mittsommerabend!
June 21, 2025 at 9:12 PM
Es ist 23:08, eine halbe Stunde vor Sonnenuntergang an St. Hans. Allen einen schönen Mittsommerabend!
As dem Leben von #IchwarHanna - ja, ich bin heute um 3:30 aufgestanden, um zur nächsten Botschaft zu fliegen (1h) für Passangelegenheiten, ja, die Sonne war da schon wach (siehe Bild), und nun geht es mit dem Zug 7h zurück…
June 19, 2025 at 12:02 PM
As dem Leben von #IchwarHanna - ja, ich bin heute um 3:30 aufgestanden, um zur nächsten Botschaft zu fliegen (1h) für Passangelegenheiten, ja, die Sonne war da schon wach (siehe Bild), und nun geht es mit dem Zug 7h zurück…
Abendbrotblick. Korsvika.
June 13, 2025 at 6:11 PM
Abendbrotblick. Korsvika.
Proximal methods have become popular on manifolds as well the last few years, among them also the proximal gradient method.
In our new preprint we derive a new proximal gradient method that for the first time does not need the embedding and/or solving problems in tangent spaces.
In our new preprint we derive a new proximal gradient method that for the first time does not need the embedding and/or solving problems in tangent spaces.
Ronny Bergmann, Hajg Jasa, Paula John, Max Pfeffer
The Intrinsic Riemannian Proximal Gradient Method for Nonconvex Optimization
https://arxiv.org/abs/2506.09775
The Intrinsic Riemannian Proximal Gradient Method for Nonconvex Optimization
https://arxiv.org/abs/2506.09775
June 12, 2025 at 7:04 AM
Proximal methods have become popular on manifolds as well the last few years, among them also the proximal gradient method.
In our new preprint we derive a new proximal gradient method that for the first time does not need the embedding and/or solving problems in tangent spaces.
In our new preprint we derive a new proximal gradient method that for the first time does not need the embedding and/or solving problems in tangent spaces.
Reposted by Ronny Bergmann
Mateusz Baran, Ronny Bergmann: A geometric perspective of state estimation using Kalman filters https://arxiv.org/abs/2506.01086 https://arxiv.org/pdf/2506.01086 https://arxiv.org/html/2506.01086
June 3, 2025 at 6:06 AM
Mateusz Baran, Ronny Bergmann: A geometric perspective of state estimation using Kalman filters https://arxiv.org/abs/2506.01086 https://arxiv.org/pdf/2506.01086 https://arxiv.org/html/2506.01086
Reposted by Ronny Bergmann
My lab, at Karolinska, in Stockholm, is looking for a PhD student with a computational/quantitative background to work on probabilistic/generative models of proteins (structure and sequence). The research will involve methods development, and applications in vaccine design.
May 15, 2025 at 1:21 PM
My lab, at Karolinska, in Stockholm, is looking for a PhD student with a computational/quantitative background to work on probabilistic/generative models of proteins (structure and sequence). The research will involve methods development, and applications in vaccine design.
Oh, this post from earlier today is missing the #julialang tag (because I forgot it).
So if you work with Lie groups somewhere, maybe consider checking out our new package LieGroups.jl!
So if you work with Lie groups somewhere, maybe consider checking out our new package LieGroups.jl!
We have a new package! LieGroups.jl juliamanifolds.github.io/LieGroups.jl... provides Lie groups based in Manifolds.jl. See the full announcement at discourse.julialang.org/t/ann-liegro...
Home · LieGroups.jl
Documentation for LieGroups.jl.
juliamanifolds.github.io
April 22, 2025 at 9:13 PM
Oh, this post from earlier today is missing the #julialang tag (because I forgot it).
So if you work with Lie groups somewhere, maybe consider checking out our new package LieGroups.jl!
So if you work with Lie groups somewhere, maybe consider checking out our new package LieGroups.jl!
Reposted by Ronny Bergmann
We have a new package! LieGroups.jl juliamanifolds.github.io/LieGroups.jl... provides Lie groups based in Manifolds.jl. See the full announcement at discourse.julialang.org/t/ann-liegro...
Home · LieGroups.jl
Documentation for LieGroups.jl.
juliamanifolds.github.io
April 22, 2025 at 11:44 AM
We have a new package! LieGroups.jl juliamanifolds.github.io/LieGroups.jl... provides Lie groups based in Manifolds.jl. See the full announcement at discourse.julialang.org/t/ann-liegro...
Reposted by Ronny Bergmann
The newest version of Manopt.jl – 0.5.12 introduces a new algorithm: The gradient projection method. See
manoptjl.org/stable/solve...
as well as the arXiv preprint
arxiv.org/abs/2504.11815
#Manifolds #julialang #Manopt
manoptjl.org/stable/solve...
as well as the arXiv preprint
arxiv.org/abs/2504.11815
#Manifolds #julialang #Manopt
April 17, 2025 at 6:26 AM
The newest version of Manopt.jl – 0.5.12 introduces a new algorithm: The gradient projection method. See
manoptjl.org/stable/solve...
as well as the arXiv preprint
arxiv.org/abs/2504.11815
#Manifolds #julialang #Manopt
manoptjl.org/stable/solve...
as well as the arXiv preprint
arxiv.org/abs/2504.11815
#Manifolds #julialang #Manopt
Reposted by Ronny Bergmann
Ronny Bergmann, Orizon P. Ferreira, Sandor N\'emeth, Jinzhen Zhu: On projection mappings and the gradient projection method on hyperbolic space forms https://arxiv.org/abs/2504.11815 https://arxiv.org/pdf/2504.11815 https://arxiv.org/html/2504.11815
April 17, 2025 at 6:06 AM
Ronny Bergmann, Orizon P. Ferreira, Sandor N\'emeth, Jinzhen Zhu: On projection mappings and the gradient projection method on hyperbolic space forms https://arxiv.org/abs/2504.11815 https://arxiv.org/pdf/2504.11815 https://arxiv.org/html/2504.11815