Tobias Lorenz

Tobias Lorenz

Ph.D. Candidate at CISPA Helmholtz Center for Information Security, supervised by Mario Fritz and Marta Kwiatkowska.
ELLIS Ph.D. Student.

Previously at University of Oxford · ETH Zürich · MPI-Inf · KIT

I build AI systems we can trust — through formal verification, certified training, and structured risk assessment.

Selected Publications

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arXiv 2026
Tobias Lorenz, Mario Fritz
LLM panels running the Delphi protocol achieve strong calibration (r=0.87–0.95) against benchmark ground truth and align closely with human expert panels, reducing elicitation time from months to minutes.
NeurIPS 2025
Tobias Lorenz, Marta Kwiatkowska, Mario Fritz
MIBP-Cert uses mixed-integer bilinear programming to compute sound, deterministic robustness bounds during training, handling complex threat models including discrete and continuous data perturbations.
ICCV 2021
Tobias Lorenz, Anian Ruoss, Mislav Balunović, Gagandeep Singh, Martin Vechev
3DCertify, the first verifier for point cloud models, certifies robustness against a wide range of semantic 3D transformations for both classification and part segmentation.
CVPR 2018
Yongqin Xian, Tobias Lorenz, Bernt Schiele, Zeynep Akata
paper·arXiv·code 1,300+ citations
A GAN that synthesizes CNN features conditioned on class-level semantic information, enabling effective generalized zero-shot learning without labeled examples of unseen classes.

Recent Talks

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Nov 2024
Panel Discussion on How to Read a Research Paper
AI Saturdays Lagos
Jun 2024
My Experiences with the ELLIS PhD Program
Vision4ai Community Workshop
May 2021
Robustness Certification for Point Cloud Models
Stanford Center for AI Safety