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pl:prolog:pllib:learning_predicate [2019/06/27 15:50] |
pl:prolog:pllib:learning_predicate [2019/06/27 15:50] (aktualna) |
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| + | ====== Learning predicate ====== | ||
| + | {{tag>family hyphotesis learning}} | ||
| + | ===== Description ===== | ||
| + | A definition of the problem of learning predicate has_daughter. | ||
| + | |||
| + | **Source**: PROLOG programming for artificial intelligence, 3rd Edition, Harlow, 2001, ISBN 0-201-40375-7. | ||
| + | ===== Download ===== | ||
| + | Program source code: {{learning_predicate.pl}} | ||
| + | ===== Listing ===== | ||
| + | <code prolog> | ||
| + | % Figure 19.1 A definition of the problem of learning predicate has_daughter. | ||
| + | |||
| + | |||
| + | % Learning from family relations | ||
| + | |||
| + | % Background knowledge | ||
| + | |||
| + | backliteral( parent(X,Y), [X,Y]). % A background literal with vars. [X,Y] | ||
| + | |||
| + | backliteral( male(X), [X]). | ||
| + | |||
| + | backliteral( female(X), [X]). | ||
| + | |||
| + | prolog_predicate( parent(_,_)). % Goal parent(_,_) executed directly by Prolog | ||
| + | prolog_predicate( male(_)). | ||
| + | prolog_predicate( female(_)). | ||
| + | |||
| + | parent( pam, bob). | ||
| + | parent( tom, bob). | ||
| + | parent( tom, liz). | ||
| + | parent( bob, ann). | ||
| + | parent( bob, pat). | ||
| + | parent( pat, jim). | ||
| + | parent( pat, eve). | ||
| + | |||
| + | female( pam). | ||
| + | male( tom). | ||
| + | male( bob). | ||
| + | female( liz). | ||
| + | female( ann). | ||
| + | female( pat). | ||
| + | male( jim). | ||
| + | female( eve). | ||
| + | |||
| + | % Positive examples | ||
| + | |||
| + | ex( has_daughter(tom)). % Tom has a daughter | ||
| + | ex( has_daughter(bob)). | ||
| + | ex( has_daughter(pat)). | ||
| + | |||
| + | % Negative examples | ||
| + | |||
| + | nex( has_daughter(pam)). % Pam doen't have a daughter | ||
| + | nex( has_daughter(jim)). | ||
| + | |||
| + | start_hyp( [ [has_daughter(X)] / [X] ] ). % Starting hypothesis | ||
| + | </code> | ||
| + | ===== Comments ===== | ||
