Veranstaltungen
- Mittwoch, 17.06.2026, 10:00 Uhr (WIAS-ESH)
- Forschungsseminar Mathematische Statistik
Dr. Anna Calissano, University College London, GB:
Statistical analysis of spatial graphs
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Abstrakt
A spatial graph is a specific type of graph with spatial attributes associated with the nodes and the edges. It is a smart modelling choice for capturing the skeleton of a shape, a blood vessel network, a porous tissue, and many other data objects with intrinsically complex geometry. In this talk, we describe how spatial graphs can be analysed using a specific metric (the Fused Gromov-Wasserstein metric). We extend a testing procedure between distributions of spatial graphs, a depth measure to describe the distribution of spatial graphs, and a dimensionality reduction procedure based on preserving key topological features. We present this variety of methods on a dataset of cardiac fibrosis tissue and on a dataset of fungus mycelium networks.
Weitere Informationen
Dieser Vortrag findet auch via Zoom statt: https://hu-berlin.zoom-x.de/j/65177102181?pwd=nUMtJOkzDx8xyWzPFezeHh0NEIQUv3.1, Meeting-ID 651 7710 2181, Kenncode: 536200
Veranstalter
Humboldt-Universität zu Berlin
Universität Potsdam
WIAS Berlin
- Mittwoch, 24.06.2026, 10:00 Uhr (WIAS-ESH)
- Forschungsseminar Mathematische Statistik
Bertrand Even, Université Paris-Saclay, Frankreich:
Computation lower bounds in latent models: Example of clustering Gaussian mixture models
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Abstrakt
In many high-dimensional problems, like sparse-PCA, planted clique, or clustering, the best known al- gorithms with polynomial time complexity fail to reach the statistical performance provably achievable by algorithms free of computational constraints. This observation has given rise to the conjecture of the existence, for some problems, of gaps - so called statistical-computational gaps - between the best possible statistical performance achievable without computational constraints, and the best performance achievable with poly-time algorithms. A powerful approach to predict the best performance achievable in poly-time is to investigate the best performance achievable by polynomials with low-degree. In this talk, I will introduce this low degree framework for estimation problems, which was first defined in 2022 in a paper by Alex Wein and Tselil Schramm. In a second time, I will talk about a specific estimation problem; Clustering Gaussian Mixture Models, for which there is a statistical-computational gap when the dimension and the number of clusters are large.
Weitere Informationen
Dieser Vortrag findet auch via Zoom statt: https://hu-berlin.zoom-x.de/j/65177102181?pwd=nUMtJOkzDx8xyWzPFezeHh0NEIQUv3.1, Meeting-ID 651 7710 2181, Kenncode: 536200
Veranstalter
Humboldt-Universität zu Berlin
Universität Potsdam
WIAS Berlin
- Freitag, 26.06.2026, 10:15 Uhr (WIAS-406)
- Seminar Nichtlineare Optimierung und Inverse Probleme
Prof. Dr. Nils-Otto Kitterød, Norwegian University of Life Sciences:
Modelling erosion and sediment transport -- Challenges and opportunities
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Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)
Veranstalter
WIAS Berlin
- Dienstag, 30.06.2026, 10:00 Uhr (WIAS-406)
- Seminar Modern Methods in Applied Stochastics and Nonparametric Statistics
Dr. Oleg Butkovsky, WIAS Berlin:
Will there still be mathematicians in 1 year? A personal experience from the "The First Proof" project
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Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)
Weitere Informationen
Dieser Vortrag findet auch via Zoom statt: https://wias-berlin-de.zoom-x.de/j/69982487566
Veranstalter
WIAS Berlin
- 6. – 8. Juli 2026 (WIAS-ESH)
- Workshop/Konferenz: Spreading Dynamics in Random Environment
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Veranstalter
WIAS Berlin
- 7. – 11. September 2026 (HUB main building)
- Workshop/Konferenz: 17th International Conference on Free Boundary Problems: Theory and Applications 2026
mehr ... Veranstaltungsort
Humboldt Universität zu Berlin, Unter den Linden 6, 10117 Berlin
Veranstalter
Humboldt-Universität zu Berlin
WIAS Berlin
- 3. – 6. November 2026 (WIAS-ESH)
- Workshop/Konferenz: Stochastic processes with reinforcement
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Veranstalter
WIAS Berlin