Abstract
A subpansive tree is a rooted tree that gives a partial order of nonterminal symbols of a context-free grammar. We formalize subpansive trees as background knowledge of CFGs, and investigate query learning of CFGs with the help of subpansive trees. We show a restricted class of CFGs, which we call hierarchical CFGs, is efficiently learnable, while it is unlikely to be polynomial-time predictable.
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Sugimoto, N., Toyoshima, T., Shimozono, S., Hirata, K. (2000). Constructive Learning of Context-Free Languages with a Subpansive Tree . In: Oliveira, A.L. (eds) Grammatical Inference: Algorithms and Applications. ICGI 2000. Lecture Notes in Computer Science(), vol 1891. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-45257-7_22
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DOI: https://doi.org/10.1007/978-3-540-45257-7_22
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