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Helge Spieker

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Do LLMs Explain or Remember? Evaluating Language Model Explanations of Reinforcement Learning Failures

This study systematically investigates how prompt structure, model architecture, and environment representation affect the quality of Explainable RL (XRL) explanations, and conducts a multi-model evaluation using quantitative metrics to assess explanation coherence, helpfulness, and stability.

Nivetha Suntharamoorthy, Jørn Eirik Betten, Dennis Gross et al. · 1 citation
#artificial intelligence Preprint Sep 2026

Probabilistic Model Checking of Autoregressive Neural Sequence Models

The pipeline extracts a discrete-time Markov chain from the SUT's token-by-token generation, verifies formal PCTL specifications with the PRISM model checker, and aggregates the per-input verdicts into a coverage curve over the input space, identifying the gap between structural completeness and chemical validity.

Helge Spieker, Dennis Gross, Arnaud Gotlieb · 0 citations

Semi-supervised CAPP Transformer Learning via Pseudo-labeling

Experiments on small-scale datasets with simulated ground truth across the full data distribution show consistent accuracy gains over baselines, demonstrating the method's effectiveness in data-scarce manufacturing environments.

Dennis Gross, Helge Spieker, Arnaud Gotlieb et al. · 0 citations
Jul 2026

Gimitest: A Comprehensive Tool for Testing Reinforcement Learning Policies

Gimitest is an open-source tool that supports various gym frameworks and allows for modifications of their integrated components and showcases its effectiveness in testing multiple RL policies in environments such as the official Farama Gymnasium and PettingZoo.

Dennis Gross, Q. Mazouni, Helge Spieker et al. · 0 citations

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