![](/images/team/christopheroux.jpg)
Christophe Roux
My research interests lie at the intersection of optimization and machine learning. In particular, I am interested in online optimization, federated learning and optimization on riemannian manifolds.
📬 Contact
- office
- Room 3107 at ZIB
- roux (at) zib.de
christophe.roux (at) campus.tu-berlin.de - homepage
- christopheroux.de
- languages
- German, English, and French
🎓 Curriculum vitae
- since 2021
- Researcher at ZIB
- 2021 to 2021
- Research Assistant at ZIB
- M.Sc. in Scientific Computing at TUB
- Feb 2018
- B.Sc. in Engineering Science at TUB
đź“ť Publications and preprints
Preprints
- Roux, C., Zimmer, M., and Pokutta, S. (2024). On the Byzantine-resilience of Distillation-based Federated Learning.
[arXiv]
[BibTeX]
@misc{byzantinefederated2024, archiveprefix = {arXiv}, eprint = {2402.12265}, primaryclass = {cs.LG}, year = {2024}, author = {Roux, Christophe and Zimmer, Max and Pokutta, Sebastian}, title = {On the Byzantine-resilience of Distillation-based Federated Learning} }
- MartĂnez-Rubio, D., Roux, C., Criscitiello, C., and Pokutta, S. (2023). Accelerated Riemannian Min-Max Optimization Ensuring Bounded Geometric Penalties.
[arXiv]
[BibTeX]
@misc{mrp_accelerated_minmax_riemannian_23, archiveprefix = {arXiv}, eprint = {2305.16186}, primaryclass = {math.OC}, year = {2023}, author = {MartĂnez-Rubio, David and Roux, Christophe and Criscitiello, Christopher and Pokutta, Sebastian}, title = {Accelerated Riemannian Min-Max Optimization Ensuring Bounded Geometric Penalties} }
- Roux, C., Wirth, E., Pokutta, S., and Kerdreux, T. (2021). Efficient Online-bandit Strategies for Minimax Learning Problems.
[arXiv]
[BibTeX]
@misc{online.bandit-minimax_2021, archiveprefix = {arXiv}, eprint = {2105.13939}, primaryclass = {cs.LG}, year = {2021}, author = {Roux, Christophe and Wirth, Elias and Pokutta, Sebastian and Kerdreux, Thomas}, title = {Efficient Online-bandit Strategies for Minimax Learning Problems} }
Conference proceedings
- MartĂnez-Rubio, D., Roux, C., and Pokutta, S. (2024). Convergence and Trade-offs in Riemannian Gradient Descent and Riemannian Proximal Point. Proceedings of International Conference on Machine Learning.
[arXiv]
[BibTeX]
@inproceedings{mrp_tradeoffs_riemannian_gradient_descent_23, year = {2024}, booktitle = {Proceedings of International Conference on Machine Learning}, archiveprefix = {arXiv}, eprint = {2403.10429}, primaryclass = {math.OC}, author = {MartĂnez-Rubio, David and Roux, Christophe and Pokutta, Sebastian}, title = {Convergence and Trade-offs in Riemannian Gradient Descent and Riemannian Proximal Point} }
Full articles
- Kerdreux, T., Roux, C., d’Aspremont, A., and Pokutta, S. (2021). Linear Bandits on Uniformly Convex Sets. Journal of Machine Learning Research, 22(284), 1–23.
[URL]
[arXiv]
[summary]
[BibTeX]
@article{KRAP2021, year = {2021}, journal = {Journal of Machine Learning Research}, month = mar, volume = {22}, number = {284}, pages = {1–23}, url = {http://jmlr.org/papers/v22/21-0277.html}, archiveprefix = {arXiv}, eprint = {2103.05907}, primaryclass = {cs.LG}, author = {Kerdreux, Thomas and Roux, Christophe and d'Aspremont, Alexandre and Pokutta, Sebastian}, title = {Linear Bandits on Uniformly Convex Sets}, summary = {https://www.pokutta.com/blog/research/2021/04/03/linearBandits.html} }
🔬 Projects
SynLab researches mathematical generalization of application-specific advances achieved in the Gas-, Rail– and MedLab of the research campus MODAL. The focus is on exact methods for solving a broad class of discrete-continuous optimization problems. This requires advanced techniques for structure recognition, consideration of nonlinear restrictions from practice, and the efficient implementation of mathematical algorithms on modern computer architectures. The results are bundled in a professional software package and complemented by a range of high-performance methods for specific applications with a high degree of innovation.
đź’¬ Talks and posters
Conference and workshop talks
- Nov 2023
- Bounding Geometric Penalties in First-order Riemannian Optimization
Seminar "Modern Methods in Applied Stochastics and Nonparametric Statistics", Berlin - Mar 2023
- Riemannian Optimization: How and Why?
Optimization and ML Workshop, Waischenfeld
Poster presentations
- Mar 2023
- Accelerated Riemannian Min-Max Optimization Ensuring Bounded Geometric Penalties
Optimization and ML Workshop, Waischenfeld