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Author

Pyrros Koussios

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#artificial intelligence Preprint Sep 2026

PetriBench: Benchmarking LLM Reasoning over Dynamic State Spaces

PetriBench is introduced, a compact, fully self-contained, and scalable benchmark for evaluating LLM reasoning over dynamic state spaces using Petri nets, a mature formalism for modeling real-world concurrent and distributed systems.

Pyrros Koussios, Benjamin Jäger, John Hua Yao et al. · 0 citations
Preprint Aug 2026

Enhancing VLM Reward Models Through Structure-Aware Fine-Tuning

Designing effective reward functions remains a major bottleneck in Reinforcement Learning (RL). Recent work uses large foundation Vision-Language Models (VLMs) as reward models, computing text-observation similarity to bypass manual reward engineering. Although promising, these rewards are often noisy and unreliable, l...

Pyrros Koussios, Chen-Hao Li, Xin Chen et al. · 0 citations

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