Integrating Counterfactual Simulations with Language Models for Explaining Multi-Agent Behaviour

• URL: http://arxiv.org/abs/2505.17801v1
• Date: Fri, 23 May 2025 12:19:18 GMT
• Title: Integrating Counterfactual Simulations with Language Models for Explaining Multi-Agent Behaviour
• Authors: Bálint Gyevnár, Christopher G. Lucas, Stefano V. Albrecht, Shay B. Cohen,
• Abstract summary: We propose Agentic eXplanations via Interrogative Simulation (AXIS)<n>AXIS generates intelligible causal explanations for pre-trained multi-agent policies.<n>We evaluate AXIS on autonomous driving across 10 scenarios for 5 LLMs.
• Score: 26.04296415316974
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Autonomous multi-agent systems (MAS) are useful for automating complex tasks but raise trust concerns due to risks like miscoordination and goal misalignment. Explainability is vital for trust calibration, but explainable reinforcement learning for MAS faces challenges in state/action space complexity, stakeholder needs, and evaluation. Using the counterfactual theory of causation and LLMs' summarisation capabilities, we propose Agentic eXplanations via Interrogative Simulation (AXIS). AXIS generates intelligible causal explanations for pre-trained multi-agent policies by having an LLM interrogate an environment simulator using queries like 'whatif' and 'remove' to observe and synthesise counterfactual information over multiple rounds. We evaluate AXIS on autonomous driving across 10 scenarios for 5 LLMs with a novel evaluation methodology combining subjective preference, correctness, and goal/action prediction metrics, and an external LLM as evaluator. Compared to baselines, AXIS improves perceived explanation correctness by at least 7.7% across all models and goal prediction accuracy by 23% for 4 models, with improved or comparable action prediction accuracy, achieving the highest scores overall.

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