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popularity(X) #
Lattice
% Elements member(X) :- number(X), 0 =< X, X =< 1. members([0.3, 0.5, 0.7]). % Distance distance(X,Y,Z) :- Z is abs(Y-X). % Ordering relation leq(X,Y) :- X =< Y. % Supremum and infimum bot(0). top(1). % Binary operations and_prod(X,Y,Z) :- pri_prod(X,Y,Z). and_godel(X,Y,Z) :- pri_min(X,Y,Z). and_luka(X,Y,Z) :- pri_add(X,Y,U1), pri_sub(U1,1,U2), pri_max(U2,0,Z). or_prod(X,Y,Z) :- pri_prod(X,Y,U1), pri_add(X,Y,U2), pri_sub(U2,U1,Z). or_godel(X,Y,Z) :- pri_max(X,Y,Z). or_luka(X,Y,Z) :- pri_add(X,Y,U1), pri_min(U1,1,Z). % Aggregators agr_aver(X,Y,Z) :- pri_add(X,Y,U1), pri_prod(U1,0.5,Z). agr_very(X,Y) :- pri_prod(X,X,Y). % Auxiliar operations pri_prod(X,Y,Z) :- Z is X * Y. pri_div(X,Y,Z) :- Z is X / Y. pri_sub(X,Y,Z) :- Z is X - Y. pri_add(X,Y,Z) :- Z is X + Y. pri_min(X,Y,Z) :- (X=
Y,Z=Y). pri_max(X,Y,Z) :- (X=
Y,Z=X).
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Tree depth
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Test cases
0.6 -> popularity(sun). 0.77 -> popularity(sweet). 0.85 -> popularity(lux).
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