SMT-Based Active Learning of Weighted Automata

Abstract:We present an SMT-based active learning algorithm for nondeterministic weighted automata (WFAs) as a practical and robust alternative to Hankel/L*-style methods. Our algorithm is parametric in a given semiring and, if it terminates, guaranteed to produce minimal WFAs. We prove partial correctness and provide a sufficient termination condition, which in particular implies termination for all finite semirings. Our extensive experimental evaluation shows that our algorithm is capable of learning numerous minimal WFAs over both finite and infinite semirings, vastly outperforms a naive baseline, and is competitive with a state-of-the-art algorithm while producing significantly smaller automata and requiring less interaction with the teacher.

Formal Languages and Automata Theory (cs.FL); Machine Learning (cs.LG)

arXiv:2605.07758 [cs.FL]

(or arXiv:2605.07758v2 [cs.FL] for this version)

https://doi.org/10.48550/arXiv.2605.07758 Focus to learn more arXiv-issued DOI via DataCite

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