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arXiv · 2511.12315

Active Learning of Symbolic Automata Over Rational Numbers

Sebastian Hagedorn·Martín Muñoz·Cristian Riveros·Rodrigo Toro Icarte
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Abstract

Automata learning has many applications in artificial intelligence and software engineering. Central to these applications is the $L^*$ algorithm, introduced by Angluin. The $L^*$ algorithm learns deterministic finite-state automata (DFAs) in polynomial time when provided with a minimally adequate teacher. Unfortunately, the $L^*$ algorithm can only learn DFAs over finite alphabets, which limits its applicability. In this paper, we extend $L^*$ to learn symbolic automata whose transitions use predicates over rational numbers, i.e., over infinite and dense alphabets. Our result makes the $L^*$ algorithm applicable to new settings like (real) RGX, and time series. Furthermore, our proposed algorithm is optimal in the sense that it asks a number of queries to the teacher that is at most linear with respect to the number of transitions, and to the representation size of the predicates.

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Sebastian Hagedorn, Martín Muñoz, Cristian Riveros, Rodrigo Toro Icarte. 2025-11-15. Active Learning of Symbolic Automata Over Rational Numbers. https://arxiv.org/abs/2511.12315

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