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✎ pl:prolog:pllib:state-space
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====== State-space ====== {{tag>planning}} ===== Description ===== A state-space definition for means-ends planning based on goal regression. **Source**: PROLOG programming for artificial intelligence, 3rd Edition, Harlow, 2001, ISBN 0-201-40375-7. ===== Download ===== Program source code: {{state-space.pl}} ===== Listing ===== <code prolog> % Figure 17.9 A state-space definition for means-ends planning based on goal % regression. Relations satisfied, achieves, preserves, regress, addnew and % delete_all are as defined in Figure 17.8. % State space representation of means-ends planning with goal regression :- op( 300, xfy, ->). s( Goals -> NextAction, NewGoals -> Action, 1) :- % All costs are 1 member( Goal, Goals), achieves( Action, Goal), can( Action, Condition), preserves( Action, Goals), regress( Goals, Action, NewGoals). goal( Goals -> Action) :- start( State), % User-defined initial situation satisfied( State, Goals). % Goals true in initial situation h( Goals -> Action, H) :- % Heuristic estimate start( State), delete_all( Goals, State, Unsatisfied), % Unsatisfied goals length( Unsatisfied, H). % Number of unsatisfied goals </code> ===== Comments =====
pl/prolog/pllib/state-space.txt
· ostatnio zmienione: 2019/06/27 15:50 (edycja zewnętrzna)
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