Abductive logic programming: Difference between revisions

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Default reasoning in ALP: references as parentheticals
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Using abduction in ALP it is possible to conclude <syntaxhighlight inline lang="prolog">canfly(mary)</syntaxhighlight> under the assumption <syntaxhighlight inline lang="prolog">normal_flying_bird(mary)</syntaxhighlight>. The conclusion can be derived from the assumption because it cannot be shown that the integrity constraint is violated, which is because it cannot be shown that <syntaxhighlight inline lang="prolog">wounded(mary).</syntaxhighlight> In contrast, it is not possible to conclude <syntaxhighlight inline lang="prolog">canfly(john),</syntaxhighlight> because the assumption <syntaxhighlight inline lang="prolog">normal_flying_bird(john)</syntaxhighlight> together with the fact <syntaxhighlight inline lang="prolog">wounded(john)</syntaxhighlight> violates the integrity constraint. This manner of reasoning in ALP simulates reasoning with negation as failure.<ref>Eshghi, K. and Kowalski, R.A., 1989, June. Abduction Compared with Negation by Failure. In ICLP (Vol. 89, pp. 234-255).</ref>
 
Conversely, it is possible to simulate abduction in ALP using negation as failure with the [[stable model semantics]].<ref>Kakas, A.C., Kowalski, R.A. and [[Francesca Toni |Toni, F.]], 1992. Abductive logic programming. Journal of logic and computation, 2(6), pp.719-770.</ref> This can be done by adding, for every abducible predicate <syntaxhighlight inline lang="prolog">p,</syntaxhighlight> an additional contrary predicate <syntaxhighlight inline lang="prolog">negp,</syntaxhighlight> and a pair of clauses:
 
<syntaxhighlight lang="prolog">
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* {{cite book |first1=A.C. |last1=Kakas |first2=P. |last2=Mancarella |chapter=Generalised Stable Models: A Semantics for Abduction |editor-first=L.C. |editor-last=Aiello |title=ECAI 90: proceedings of the 9th European Conference on Artificial Intelligence |publisher=Pitman |year=1990 |isbn=978-0273088226 |pages=385–391 }}
* {{cite journal |first1=L. |last1=Console |first2=D.T. |last2=Dupre |first3=P. |last3=Torasso |title=On the Relationship between Abduction and Deduction |journal=[[Journal of Logic and Computation]] |volume=1 |issue=5 |pages=661–690 |year=1991 |doi=10.1093/logcom/1.5.661 |citeseerx=10.1.1.31.9982 }}
* {{cite journal |first1=A.C. |last1=Kakas |first2=R.A. |last2=Kowalski |author2link = Robert Kowalski|first3=F. |last3=Toni|author3-link= Francesca Toni |title=Abductive Logic Programming |journal=Journal of Logic and Computation |volume=2 |issue=6 |pages=719–770 |year=1993 |doi=10.1093/logcom/2.6.719 |citeseerx=10.1.1.37.3655 }}
* {{cite journal |first1=Marc |last1=Denecker |first2=Danny |last2=De Schreye |title=SLDNFA: An Abductive Procedure for Abductive Logic Programs |journal=[[Journal of Logic Programming]] |volume=34 |issue=2 |pages=111–167 |date=February 1998 |doi=10.1016/S0743-1066(97)00074-5 |citeseerx = 10.1.1.21.6503 }}
* {{cite journal |first1=M. |last1=Denecker |first2=A.C. |last2=Kakas |title=Special issue: abductive logic programming |journal=Journal of Logic Programming |volume=44 |issue=1–3 |pages=1–4 |date=July 2000 |doi=10.1016/S0743-1066(99)00078-3 |doi-access=free }}