362 lines
8.3 KiB
Prolog
362 lines
8.3 KiB
Prolog
/*
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CEM
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Copyright (c) 2011, Fabrizio Riguzzi
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*/
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:- module(inference,[find_deriv_inf1/3]).
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:-multifile setting/2.
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:-dynamic setting/2.
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%:-load_foreign_files(['cplint'],[],init_my_predicates).
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:-use_module(library(lists)).
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:-use_module(library(avl)).
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/* start of list of parameters that can be set by the user with
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set(Parameter,Value) */
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setting(epsilon_parsing,0.00001).
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setting(save_dot,false).
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setting(ground_body,true).
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/* available values: true, false
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if true, both the head and the body of each clause will be grounded, otherwise
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only the head is grounded. In the case in which the body contains variables
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not appearing in the head, the body represents an existential event */
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/* end of list of parameters */
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/* s(GoalsLIst,Prob) compute the probability of a list of goals
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GoalsLis can have variables, s returns in backtracking all the solutions with their
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corresponding probability */
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find_deriv_inf1(GoalsList,DB,Deriv):-
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solve1(GoalsList,DB,[],Deriv).
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find_deriv_inf(GoalsList,D,Deriv):-
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solve(GoalsList,D,[],Deriv).
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/* duplicate can appear in the C set because two different unistantiated clauses may become the
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same clause when instantiated */
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solve([],_D,C,C):-!.
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solve([\+ H|T],DB,CIn,COut):-
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functor(H,F,Args),
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Args1 is Args-1,
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user:input_cw(F/Args1),!,
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call(user:neg(H)),
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solve(T,DB,CIn,COut).
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solve([\+ H |T],DB,CIn,COut):-!,
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DB > 0,
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DB1 is DB-1,
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list2and(HL,H),
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functor(H,F,Args),
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Args1 is Args-1,
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(user:input(F/Args1)->
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call(user:neg(H))
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;
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\+ H
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),
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(setof(D,find_deriv_inf(HL,DB1,D),L)->
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choose_clauses(CIn,L,C1),
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solve(T,DB1,C1,COut)
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;
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solve(T,DB1,CIn,COut)
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).
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solve([H|T],D,CIn,COut):-
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builtin(H),!,
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call(H),
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solve(T,D,CIn,COut).
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solve([H|T],DB,CIn,COut):-
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user:db(H),!,
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call(user:H),
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solve(T,DB,CIn,COut).
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solve([H|T],DB,CIn,COut):-
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functor(H,F,Args),
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Args1 is Args-1,
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user:input_cw(F/Args1),!,
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call(user:H),
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solve(T,DB,CIn,COut).
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solve([H|T],D,CIn,COut):-
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functor(H,F,Args),
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Args1 is Args-1,
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user:input(F/Args1),
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call(user:H),
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solve(T,D,CIn,COut).
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solve([H|T],D,CIn,COut):-
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user:def_rule(H,B),
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append(B,T,NG),
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solve(NG,D,CIn,COut).
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solve([H|T],D,CIn,COut):-
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D>=1,
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find_rule(H,(R,S,N),B,CIn),
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solve_pres(R,S,N,B,T,D,CIn,COut).
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solve_pres(R,S,N,B,T,D,CIn,COut):-
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member_eq((N,R,S),CIn),!,
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append(B,T,NG),
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D1 is D-1,
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solve(NG,D1,CIn,COut).
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solve_pres(R,S,N,B,T,D,CIn,COut):-
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append(CIn,[(N,R,S)],C1),
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append(B,T,NG),
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D1 is D-1,
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solve(NG,D1,C1,COut).
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solve1([],_D,C,C):-!.
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solve1([\+ H |T],DB,CIn,COut):-!,
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DB>=1,
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list2and(HL,H),
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findall(D,find_deriv_inf1(HL,DB,D),L),
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choose_clauses(CIn,L,C1),
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solve(T,C1,COut).
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solve1([H|T],D,CIn,COut):-
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user:def_rule(H,B),
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append(B,T,NG),
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solve(NG,D,CIn,COut).
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solve1([H|T],D,CIn,COut):-
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D>=1,
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find_rule(H,(R,S,N),B,CIn),
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solve_pres(R,S,N,B,T,D,CIn,COut).
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not_present_with_a_different_head(_N,_R,_S,[]).
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not_present_with_a_different_head(N,R,S,[(N,R,S)|T]):-!,
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not_present_with_a_different_head(N,R,S,T).
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not_present_with_a_different_head(N,R,S,[(_N1,R,S1)|T]):-
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S\=S1,!,
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not_present_with_a_different_head(N,R,S,T).
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not_present_with_a_different_head(N,R,S,[(_N1,R1,_S1)|T]):-
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R\=R1,
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not_present_with_a_different_head(N,R,S,T).
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/* find_rule(G,(R,S,N),Body,C) takes a goal G and the current C set and
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returns the index R of a disjunctive rule resolving with G together with
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the index N of the resolving head, the substitution S and the Body of the
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rule */
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find_rule(H,(R,S,N),Body,C):-
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user:rule(H,_P,N,R,S,_,_Head,Body),
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not_already_present_with_a_different_head(N,R,S,C).
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not_already_present_with_a_different_head(_N,_R,_S,[]).
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not_already_present_with_a_different_head(N,R,S,[(N1,R,S1)|T]):-
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not_different(N,N1,S,S1),!,
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not_already_present_with_a_different_head(N,R,S,T).
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not_already_present_with_a_different_head(N,R,S,[(_N1,R1,_S1)|T]):-
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R\==R1,
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not_already_present_with_a_different_head(N,R,S,T).
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not_different(_N,_N1,S,S1):-
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S\=S1,!.
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not_different(N,N1,S,S1):-
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N\=N1,!,
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dif(S,S1).
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not_different(N,N,S,S).
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member_head(H,[(H:_P)|_T],N,N).
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member_head(H,[(_H:_P)|T],NIn,NOut):-
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N1 is NIn+1,
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member_head(H,T,N1,NOut).
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/* choose_clauses(CIn,LC,COut) takes as input the current C set and
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the set of C sets for a negative goal and returns a new C set that
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excludes all the derivations for the negative goals */
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choose_clauses(C,[],C).
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choose_clauses(CIn,[D|T],COut):-
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member((N,R,S),D),
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already_present_with_a_different_head(N,R,S,CIn),!,
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choose_a_head(N,R,S,CIn,C1),
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choose_clauses(C1,T,COut).
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choose_clauses(CIn,[D|T],COut):-
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member((N,R,S),D),
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new_head(N,R,S,N1),
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\+ already_present(N1,R,S,CIn),
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impose_dif_cons(R,S,CIn),
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choose_clauses([(N1,R,S)|CIn],T,COut).
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impose_dif_cons(_R,_S,[]):-!.
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impose_dif_cons(R,S,[(_NH,R,SH)|T]):-!,
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dif(S,SH),
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impose_dif_cons(R,S,T).
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impose_dif_cons(R,S,[_H|T]):-
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impose_dif_cons(R,S,T).
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/* instantiation_present_with_the_same_head(N,R,S,C)
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takes rule R with substitution S and selected head N and a C set
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and asserts dif constraints for all the clauses in C of which RS
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is an instantitation and have the same head selected */
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instantiation_present_with_the_same_head(_N,_R,_S,[]).
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instantiation_present_with_the_same_head(N,R,S,[(NH,R,SH)|T]):-
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\+ \+ S=SH,!,
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dif_head_or_subs(N,R,S,NH,SH,T).
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instantiation_present_with_the_same_head(N,R,S,[_H|T]):-
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instantiation_present_with_the_same_head(N,R,S,T).
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dif_head_or_subs(N,R,S,NH,_SH,T):-
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dif(N,NH),
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instantiation_present_with_the_same_head(N,R,S,T).
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dif_head_or_subs(N,R,S,N,SH,T):-
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dif(S,SH),
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instantiation_present_with_the_same_head(N,R,S,T).
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/* case 1 of Select: a more general rule is present in C with
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a different head, instantiate it */
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choose_a_head(N,R,S,[(NH,R,SH)|T],[(NH,R,SH)|T]):-
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S=SH,
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dif(N,NH).
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/* case 2 of Select: a more general rule is present in C with
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a different head, ensure that they do not generate the same
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ground clause */
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choose_a_head(N,R,S,[(NH,R,SH)|T],[(NH,R,S),(NH,R,SH)|T]):-
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\+ \+ S=SH, S\==SH,
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dif(N,NH),
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dif(S,SH).
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choose_a_head(N,R,S,[H|T],[H|T1]):-
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choose_a_head(N,R,S,T,T1).
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/* select a head different from N for rule R with
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substitution S, return it in N1 */
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new_head(N,R,S,N1):-
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user:rule_by_num(R,S,Numbers,Head,_Body),
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Head\=uniform(_,_,_),!,
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nth0(N, Numbers, _Elem, Rest),
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member(N1,Rest).
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already_present_with_a_different_head(N,R,S,[(NH,R,SH)|_T]):-
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\+ \+ S=SH,NH \= N.
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already_present_with_a_different_head(N,R,S,[_H|T]):-
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already_present_with_a_different_head(N,R,S,T).
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/* checks that a rule R with head N and selection S is already
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present in C (or a generalization of it is in C) */
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already_present(N,R,S,[(N,R,SH)|_T]):-
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S=SH.
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already_present(N,R,S,[_H|T]):-
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already_present(N,R,S,T).
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/* rem_dup_lists removes the C sets that are a superset of
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another C sets further on in the list of C sets */
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/* rem_dup_lists removes the C sets that are a superset of
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another C sets further on in the list of C sets */
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rem_dup_lists([],L,L).
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rem_dup_lists([H|T],L0,L):-
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(member_subset(H,T);member_subset(H,L0)),!,
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rem_dup_lists(T,L0,L).
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rem_dup_lists([H|T],L0,L):-
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rem_dup_lists(T,[H|L0],L).
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member_subset(E,[H|_T]):-
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subset_my(H,E),!.
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member_subset(E,[_H|T]):-
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member_subset(E,T).
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member_eq(A,[H|_T]):-
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A==H,!.
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member_eq(A,[_H|T]):-
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member_eq(A,T).
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subset_my([],_).
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subset_my([H|T],L):-
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member_eq(H,L),
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subset_my(T,L).
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remove_duplicates_eq([],[]).
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remove_duplicates_eq([H|T],T1):-
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member_eq(H,T),!,
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remove_duplicates_eq(T,T1).
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remove_duplicates_eq([H|T],[H|T1]):-
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remove_duplicates_eq(T,T1).
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builtin(_A is _B).
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builtin(_A > _B).
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builtin(_A < _B).
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builtin(_A >= _B).
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builtin(_A =< _B).
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builtin(_A =:= _B).
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builtin(_A =\= _B).
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builtin(true).
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builtin(false).
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builtin(_A = _B).
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builtin(_A==_B).
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builtin(_A\=_B).
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builtin(_A\==_B).
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builtin(length(_L,_N)).
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builtin(member(_El,_L)).
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builtin(average(_L,_Av)).
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builtin(max_list(_L,_Max)).
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builtin(min_list(_L,_Max)).
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builtin(nth0(_,_,_)).
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builtin(nth(_,_,_)).
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average(L,Av):-
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sum_list(L,Sum),
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length(L,N),
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Av is Sum/N.
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list2or([],true):-!.
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list2or([X],X):-
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X\=;(_,_),!.
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list2or([H|T],(H ; Ta)):-!,
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list2or(T,Ta).
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list2and([],true):-!.
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list2and([X],X):-
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X\=(_,_),!.
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list2and([H|T],(H,Ta)):-!,
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list2and(T,Ta).
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