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yap-6.3/packages/CLPBN/examples/School/parschema.yap

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:- use_module(library(pfl)).
/* base file for school database. Supposed to be called from school_*.yap */
%
% bayes is a parfactor for a bayesian network,
% first argument is target of other arguments pop(K) <- abi(K)
% second argument is the name of a predicate to call for \phi (CPT)
% last argument is a list of goals defining the constraints over the elements
% of the
%
%
% these states that skolem variables abi(K) are in a parametric factor with
% with \phi defined by abi_table(X) and whose domain and constraints
% is obtained from professor/1.
%
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bayes abi(K)::[h,m,l] ; abi_table ; [professor(K)].
bayes pop(K)::[h,m,l], abi(K) ; pop_table ; [professor(K)].
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bayes diff(C) :: [h,m,l] ; diff_table ; [course(C,_)].
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bayes int(S) :: [h,m,l] ; int_table ; [student(S)].
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bayes grade(C,S)::[a,b,c,d], int(S), diff(C) ; grade_table ; [registration(_,C,S)].
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bayes satisfaction(C,S)::[h,m,l], abi(P), grade(C,S) ; sat_table ; [reg_satisfaction(C,S,P)].
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bayes rat(C) :: [h,m,l], agg(Sats) ; avg ; [course_rat(C, Sats)].
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bayes rank(S) :: [a,b,c,d], agg(Grades) ; avg ; [student_ranking(S,Grades)].
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grade(Key, Grade) :-
registration(Key, CKey, SKey),
grade(CKey, SKey, Grade).
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reg_satisfaction(CKey, SKey, PKey) :-
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registration(_Key, CKey, SKey),
course(CKey, PKey).
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course_rat(CKey, Sats) :-
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course(CKey, _),
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setof(satisfaction(CKey,SKey,PKey),
reg_satisfaction(CKey, SKey, PKey),
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Sats).
student_ranking(SKey, Grades) :-
student(SKey),
setof(grade(CKey,SKey), RKey^registration(RKey,CKey,SKey), Grades).
:- ensure_loaded(tables).
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% convert to longer names
professor_ability(P,A) :- abi(P, A).
professor_popularity(P,A) :- pop(P, A).
registration_grade(R,A) :-
registration(R,C,S),
grade(C,S,A).
registration_satisfaction(R,A) :-
registration(R,C,S),
satisfaction(C,S,A).
student_intelligence(P,A) :- int(P, A).
course_difficulty(P,A) :- diff(P, A).
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registration_course(R,C) :-
registration(R, C, _).
registration_student(R,S) :-
registration(R, _, S).
course_rating(C,X) :- rat(C,X).
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%
% evidence
%
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%abi(p0, h).
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%pop(p1, m).
%pop(p2, h).
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% Query
% ?- abi(p0, X).