ddnnfs.
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@ -1,7 +1,7 @@
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:- module(ddnnf,
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[cnf_to_ddnnf/5,
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ddnnf/5,
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[cnf_to_ddnnf/3,
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ddnnf/3,
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ddnnf_is/2]).
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:- use_module(library(lists)).
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@ -15,10 +15,10 @@
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% convert a CNF as list with Variables Vars and Existential variables
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% in DDNNF, Exs \in LVars into DDNNF with extra existential vars
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%
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cnf_to_ddnnf(CNF0, Vars, Exs, LVars, DDNNF) :-
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cnf_to_ddnnf(CNF0, PVs, DDNNF) :-
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term_variables(CNF0, Vars),
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list2cnf(CNF0, CNF, []),
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new_variables_in_term(Vars, CNF, LVars),
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append(Exs, LVars, MVars),
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append(Vars, LVars, AllVars),
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% (numbervars(CNF,1,_), writeln(CNF), fail ; true),
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open(dimacs, write, S),
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@ -26,11 +26,11 @@ cnf_to_ddnnf(CNF0, Vars, Exs, LVars, DDNNF) :-
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close(S),
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% execute c2d at this point, but we're lazy%
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% unix(system('c2d -dt_method 3 -in dimacs')),
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unix(system('c2d -in dimacs')),
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unix(system('c2d -visualize -in dimacs')),
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open('dimacs.nnf',read,R),
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SVars =.. [v|AllVars],
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% ones(LVars),
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input_ddnnf(R, SVars, MVars, DDNNF),
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input_ddnnf(R, SVars, PVs, DDNNF),
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% writeln(DDNNF),
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close(R).
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@ -97,14 +97,13 @@ disj(A, NO) -->
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%
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% ex: (A*B+not(B))*(C=B) into something complicated
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%
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ddnnf(List, Vars, Exs, LVars, DDNNF) :-
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ddnnf(List, PVs, DDNNF) :-
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exps2conj(List, Conj),
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cnf(Conj, CNF),
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% (numbervars(CNF,1,_), writeln(Vars:CNF), fail ; true),
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open(dimacs, write, S),
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new_variables_in_term(Vars, CNF, LVars),
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append(Exs, LVars, MVars),
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append(Vars, LVars, AllVars),
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variables_in_term(PVs, CNF, LVars),
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append(PVs, LVars, AllVars),
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cnf_to_file(CNF, AllVars, S),
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close(S),
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% execute c2d at this point, but we're lazy
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@ -112,7 +111,7 @@ ddnnf(List, Vars, Exs, LVars, DDNNF) :-
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open('dimacs.nnf',read,R),
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SVars =.. [v|AllVars],
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% ones(LVars),
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input_ddnnf(R, SVars, MVars, DDNNF),
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input_ddnnf(R, SVars, PVs, DDNNF),
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close(R).
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exps2conj((C1,C2), CC1*CC2) :- !,
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@ -163,47 +162,47 @@ output_cnf([V|CNF], S) :-
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format(S, '~d ',[V]),
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output_cnf(CNF, S).
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input_ddnnf(Stream, SVars, Exs, ddnnf(Out, SVars, Result)) :-
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input_ddnnf(Stream, SVars, PVs, ddnnf(Out, SVars, Result)) :-
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read_line_to_codes(Stream, Header),
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split(Header, ["nnf",VS,_ES,_NS]),
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number_codes(NVs, VS),
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functor(TempResults, nnf, NVs),
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process_nnf_lines(Stream, SVars, Exs, 1, TempResults, Out, Last),
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process_nnf_lines(Stream, SVars, PVs, 1, TempResults, Out, Last),
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Last1 is Last-1,
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arg(Last1, TempResults, Result).
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process_nnf_lines(Stream, SVars, Exs, LineNumber, TempResults, O, LL) :-
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process_nnf_lines(Stream, SVars, PVs, LineNumber, TempResults, O, LL) :-
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read_line_to_codes(Stream, Codes),
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( Codes = end_of_file -> O = [], LL = LineNumber ;
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% (LineNumber > 1 -> N is LineNumber-1, arg(N,TempResults,P), format("~w ",[P]);true),
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% format("~s~n",[Codes]),
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arg(LineNumber, TempResults, P),
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process_nnf_line(SVars, Exs, TempResults, Exp0, Codes, []),
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process_nnf_line(SVars, PVs, TempResults, Exp0, Codes, []),
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simplify_line(P=Exp0, Lines, O),
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NewLine is LineNumber+1,
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process_nnf_lines(Stream, SVars, Exs, NewLine, TempResults, Lines, LL)
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process_nnf_lines(Stream, SVars, PVs, NewLine, TempResults, Lines, LL)
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).
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process_nnf_line(SVars, Exs, _TempResults, Exp) --> "L ",
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nnf_leaf(SVars, Exs, Exp).
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process_nnf_line(SVars, PVs, _TempResults, Exp) --> "L ",
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nnf_leaf(SVars, PVs, Exp).
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process_nnf_line(_SVars, _, TempResults, Exp) --> "A ",
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nnf_and_node(TempResults, Exp).
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process_nnf_line(_SVars, _, TempResults, Exp) --> "O ",
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nnf_or_node(TempResults, Exp).
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nnf_leaf(SVars, Exs, Prob, Codes, []) :-
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nnf_leaf(SVars, PVs, Prob, Codes, []) :-
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number_codes(Number, Codes),
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Abs is abs(Number),
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arg(Abs, SVars, Node),
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(Number < 0 ->
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(existential(Node,Exs) -> Prob = 1 ; Prob = 1-Node )
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(parameter(Node,PVs) -> Prob = 1-Node ; Prob = 1 )
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;
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Prob = Node
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).
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existential(F,[F1|Exs]) :- F == F1, !.
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existential(F,[_|Exs]) :-
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existential(F, Exs).
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parameter(F,[F1|_Exs]) :- F == F1, !.
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parameter(F,[_|Exs]) :-
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parameter(F, Exs).
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nnf_and_node(TempResults, Product, Codes, []) :-
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split(Codes, [_|NumberAsStrings]),
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@ -246,7 +245,9 @@ propagate_constants(Exp, A, Lines, [(A=Exp)|Lines]).
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% compute the value of a SP
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%
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%
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ddnnf_is(ddnnf(F, _Vs, Out), Out) :-
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ddnnf_is(ddnnf(F, Vs, Out), Out) :-
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term_variables(Vs,LVs),
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ones(LVs),
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%(numbervars(F,1,_),writeln(F),fail;true),
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ddnnf_is_acc(F).
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