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Jan Křetinský

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#machine learning Preprint Oct 2026

FoSeRL: Formal Sequential Robustness Certification for Reinforcement Learning Policies

FoSeRL, a framework for certifying deployed RL policies against precommitted, temporally sparse action attacks, is introduced, which achieves substantially larger certified budgets than policy smoothing, and reveals marked robustness differences among policies with comparable nominal performance.

Sara Taheri, D. Ganguly, Jan Křetinský et al. · 0 citations
Preprint Jul 2026

dtControl2+$\varepsilon$: Trading Optimality for Explainability in MDPs via Decision Trees

This work constructs a smaller decision tree, distilling the essence of the controller, while still guaranteeing its $\varepsilon$-optimality, which enables the tool to provide tunably simpler explanations, omitting a controllable amount of detail.

Tereza Kinská, Jan Křetinský, Tobias Meggendorfer et al. · 0 citations
Preprint Aug 2026

Quantifying Risk Under Evolving Uncertainty: Belief-Dependent Robustness for Safe Sequential Decision Making

RATTL targets runtime safety for agents, including LLM-based systems, acting under uncertainty, and proves a Safety Sandwich: the RATTL value lies between the uninformed robust value and the full- knowledge optimum, with a gap that vanishes as the posterior concentrates.

D. Ganguly, Jan Křetinský · 0 citations
#artificial intelligence Preprint Aug 2026

Robust Risk Under Evolving Uncertainty: A Wasserstein Counterpart of the Entropic Value-at-Risk

An agent still learning its environment should be cautious while ignorant and bold once confident. The entropic value-at-risk captures this through a robust-optimization identity---a confidence level fixes the radius of a relative-entropy ball of alternative models---but that ball cannot reach catastrophes the nominal...

D. Ganguly, Jan Křetinský · 0 citations

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