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Separating Positive and Negative Data Examples by Concepts and Formulas: The Case of Restricted Signatures

2020-07-06 11:58:02
Jean Christoph Jung, Carsten Lutz, Hadrien Pulcini, Frank Wolter
arXiv_AI
   
Abstract

We study the separation of positive and negative data examples in terms of description logic (DL) concepts and formulas of decidable FO fragments, in the presence of an ontology. In contrast to previous work, we add a signature that specifies a subset of the symbols from the data and ontology that can be used for separation. We consider weak and strong versions of the resulting problem that differ in how the negative examples are treated. Our main results are that (a projective form of) the weak version is decidable in $\mathcal{ALCI}$ while it is undecidable in the guarded fragment GF, the guarded negation fragment GNF, and the DL $\mathcal{ALCFIO}$, and that strong separability is decidable in $\mathcal{ALCI}$, GF, and GNF. We also provide (mostly tight) complexity bounds.

Abstract (translated)

URL

https://arxiv.org/abs/2007.02669

PDF

https://arxiv.org/pdf/2007.02669.pdf

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