Auditability Is Not One Property: Rule Overlap, Behavioural Agreement, and Composition in Reinforcement Learning
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Computer Science > Machine Learning
arXiv:2609.28581 (cs)
[Submitted on 23 Sep 2026]
Title:Auditability Is Not One Property: Rule Overlap, Behavioural Agreement, and Composition in Reinforcement Learning
Authors:Liu Hung Ming
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Abstract:Reinforcement-learning (RL) policies are often distributed as opaque neural checkpoints, while training logs show that a run occurred without explaining what the policy learned. We study whether independently trained policies can be represented and composed through auditable discrete behavioral rules. We define auditability as six separately testable predicates: trace integrity, lossless coding, rule coverage, behavioral agreement, composition quality, and value-model reliability. Our protocol uses a shared frozen symbolizer, passive rule extraction, an append-only hash-bound ledger, exact environment replay, and offline confidence-ranked arbitration with an explicit blind-spot fallback.
The results place strict limits on this description layer. Rule-set overlap does not imply behavioral agreement: policies may share symbolic rules while choosing near-chance-matching actions on fresh states. The fused policy therefore selects among existing rules rather than generating a new skill. On a conflict-dominated task, an apparent fusion failure is traced to an induction/deployment mismatch: rules induced from sampled actions were evaluated under argmax actions, and deployment-consistent re-induction reverses the arbitration ordering. A fitted-Q generalized-policy-improvement diagnostic also fails in both environments, limiting claims that rule fusion is superior to value-based composition. One exploratory comparison favors rule fusion, but its comparator is post hoc, the task is partly saturated, and the fused policy remains below the strongest held-out actor.
We contribute an evidence-bounded audit and composition protocol, not a claim of universal interpretability or autonomous skill generation. Future work must add temporally extended skills, cross-skill interfaces, composition search, and independent novelty audits.
| Comments: | 35 pages, 4 figures, 14 tables. Experimental results cover eight random seeds on CartPole-v1 and Acrobot-v1. Code, data, and audit artifacts are available in the accompanying repository |
| Subjects: | Machine Learning (cs.LG); Artificial Intelligence (cs.AI) |
| Cite as: | arXiv:2609.28581 [cs.LG] |
| (or arXiv:2609.28581v1 [cs.LG] for this version) | |
| https://doi.org/10.48550/arXiv.2609.28581
arXiv-issued DOI via DataCite (pending registration)
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View a PDF of the paper titled Auditability Is Not One Property: Rule Overlap, Behavioural Agreement, and Composition in Reinforcement Learning, by Liu Hung Ming
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