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.
Mitten in der Stadt bei vollem Licht, trot dem nit bloßem Auge zu sehen. #Nordlicht
January 20, 2026 at 6:14 PM
Mitten in der Stadt bei vollem Licht, trot dem nit bloßem Auge zu sehen. #Nordlicht
Reposted by Ronny Bergmann
Accompanying the talk at the last JuliaCon and the LieGroups.jl package, we now have a JuliaCon Proceedings paper giving a short introduction to Lie groups and how to work with them in Julia
doi.org/10.21105/jco...
doi.org/10.21105/jco...
January 13, 2026 at 1:49 PM
Accompanying the talk at the last JuliaCon and the LieGroups.jl package, we now have a JuliaCon Proceedings paper giving a short introduction to Lie groups and how to work with them in Julia
doi.org/10.21105/jco...
doi.org/10.21105/jco...
Reposted by Ronny Bergmann
Mateusz Baran gave a nice overview at #JuliaCon2025 about the JuliaManifolds ecosystem in #julialang: Manifolds in numerical computations with JuliaManifolds youtu.be/ybbhy8nnlEA?...
Manifolds in numerical computations with JuliaManifolds | Baran | JuliaCon Global 2025
YouTube video by The Julia Programming Language
youtu.be
December 22, 2025 at 1:42 PM
Mateusz Baran gave a nice overview at #JuliaCon2025 about the JuliaManifolds ecosystem in #julialang: Manifolds in numerical computations with JuliaManifolds youtu.be/ybbhy8nnlEA?...
Reposted by Ronny Bergmann
At #JuliaCOn2025 @ronnybergmann.net gave a talk about LieGroups.jl. That is now available online #julialang #manifolds #LieGroups
youtu.be/_L9u8r42oSQ?...
youtu.be/_L9u8r42oSQ?...
December 9, 2025 at 6:06 AM
At #JuliaCOn2025 @ronnybergmann.net gave a talk about LieGroups.jl. That is now available online #julialang #manifolds #LieGroups
youtu.be/_L9u8r42oSQ?...
youtu.be/_L9u8r42oSQ?...
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
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
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
Reposted by Ronny Bergmann
Reposted by Ronny Bergmann
This fall I'm organizing a conference about open-source software. Thing is, I'm tired of plenaries given by straight white dudes.
Does the hive mind have *diverse* recommendations for speakers located in Europe who have interesting things to say about programming? Got some names but would love more!
Does the hive mind have *diverse* recommendations for speakers located in Europe who have interesting things to say about programming? Got some names but would love more!
March 18, 2025 at 3:37 PM
This fall I'm organizing a conference about open-source software. Thing is, I'm tired of plenaries given by straight white dudes.
Does the hive mind have *diverse* recommendations for speakers located in Europe who have interesting things to say about programming? Got some names but would love more!
Does the hive mind have *diverse* recommendations for speakers located in Europe who have interesting things to say about programming? Got some names but would love more!
We are giving an introduction to Julia!
Next Tuesday, March 20, 16.00 at Seminarroom S5, Sentralbygg 2, NTNU (Trondheim).
You can also see that on our homepage julia-users-trondheim.github.io and have a sneak preview at the slides already at github.com/Julia-Users-...
Next Tuesday, March 20, 16.00 at Seminarroom S5, Sentralbygg 2, NTNU (Trondheim).
You can also see that on our homepage julia-users-trondheim.github.io and have a sneak preview at the slides already at github.com/Julia-Users-...
March 10, 2025 at 7:38 AM
We are giving an introduction to Julia!
Next Tuesday, March 20, 16.00 at Seminarroom S5, Sentralbygg 2, NTNU (Trondheim).
You can also see that on our homepage julia-users-trondheim.github.io and have a sneak preview at the slides already at github.com/Julia-Users-...
Next Tuesday, March 20, 16.00 at Seminarroom S5, Sentralbygg 2, NTNU (Trondheim).
You can also see that on our homepage julia-users-trondheim.github.io and have a sneak preview at the slides already at github.com/Julia-Users-...
Reposted by Ronny Bergmann
In the new version Manopt.jl v0.5.7 we introduce the
Mesh Adaptive Direct Reach (MADS) algorithm(s)
manoptjl.org/stable/solve...
mainly providing the LTMADS which @oddsen.bsky.social worked on in his masters thesis.
Thanks Sander!
#Manifolds #julialang #Manopt
Mesh Adaptive Direct Reach (MADS) algorithm(s)
manoptjl.org/stable/solve...
mainly providing the LTMADS which @oddsen.bsky.social worked on in his masters thesis.
Thanks Sander!
#Manifolds #julialang #Manopt
MADS · Manopt.jl
Documentation for Manopt.jl.
manoptjl.org
February 20, 2025 at 1:26 PM
In the new version Manopt.jl v0.5.7 we introduce the
Mesh Adaptive Direct Reach (MADS) algorithm(s)
manoptjl.org/stable/solve...
mainly providing the LTMADS which @oddsen.bsky.social worked on in his masters thesis.
Thanks Sander!
#Manifolds #julialang #Manopt
Mesh Adaptive Direct Reach (MADS) algorithm(s)
manoptjl.org/stable/solve...
mainly providing the LTMADS which @oddsen.bsky.social worked on in his masters thesis.
Thanks Sander!
#Manifolds #julialang #Manopt