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ddnnfs.

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This commit is contained in:
Vitor Santos Costa 2012-04-20 16:43:30 -05:00
parent 220f7e6efc
commit 22f702f8e4
1 changed files with 25 additions and 24 deletions
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49
packages/bdd/ddnnf.yap
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@ -1,7 +1,7 @@
:- module(ddnnf, :- module(ddnnf,
[cnf_to_ddnnf/5, [cnf_to_ddnnf/3,
ddnnf/5, ddnnf/3,
ddnnf_is/2]). ddnnf_is/2]).
:- use_module(library(lists)). :- use_module(library(lists)).
@ -15,10 +15,10 @@
% convert a CNF as list with Variables Vars and Existential variables % convert a CNF as list with Variables Vars and Existential variables
% in DDNNF, Exs \in LVars into DDNNF with extra existential vars % in DDNNF, Exs \in LVars into DDNNF with extra existential vars
% %
cnf_to_ddnnf(CNF0, Vars, Exs, LVars, DDNNF) :- cnf_to_ddnnf(CNF0, PVs, DDNNF) :-
term_variables(CNF0, Vars),
list2cnf(CNF0, CNF, []), list2cnf(CNF0, CNF, []),
new_variables_in_term(Vars, CNF, LVars), new_variables_in_term(Vars, CNF, LVars),
append(Exs, LVars, MVars),
append(Vars, LVars, AllVars), append(Vars, LVars, AllVars),
% (numbervars(CNF,1,_), writeln(CNF), fail ; true), % (numbervars(CNF,1,_), writeln(CNF), fail ; true),
open(dimacs, write, S), open(dimacs, write, S),
@ -26,11 +26,11 @@ cnf_to_ddnnf(CNF0, Vars, Exs, LVars, DDNNF) :-
close(S), close(S),
% execute c2d at this point, but we're lazy% % execute c2d at this point, but we're lazy%
% unix(system('c2d -dt_method 3 -in dimacs')), % unix(system('c2d -dt_method 3 -in dimacs')),
unix(system('c2d -in dimacs')), unix(system('c2d -visualize -in dimacs')),
open('dimacs.nnf',read,R), open('dimacs.nnf',read,R),
SVars =.. [v|AllVars], SVars =.. [v|AllVars],
% ones(LVars), % ones(LVars),
input_ddnnf(R, SVars, MVars, DDNNF), input_ddnnf(R, SVars, PVs, DDNNF),
% writeln(DDNNF), % writeln(DDNNF),
close(R). close(R).
@ -97,14 +97,13 @@ disj(A, NO) -->
% %
% ex: (A*B+not(B))*(C=B) into something complicated % ex: (A*B+not(B))*(C=B) into something complicated
% %
ddnnf(List, Vars, Exs, LVars, DDNNF) :- ddnnf(List, PVs, DDNNF) :-
exps2conj(List, Conj), exps2conj(List, Conj),
cnf(Conj, CNF), cnf(Conj, CNF),
% (numbervars(CNF,1,_), writeln(Vars:CNF), fail ; true), % (numbervars(CNF,1,_), writeln(Vars:CNF), fail ; true),
open(dimacs, write, S), open(dimacs, write, S),
new_variables_in_term(Vars, CNF, LVars), variables_in_term(PVs, CNF, LVars),
append(Exs, LVars, MVars), append(PVs, LVars, AllVars),
append(Vars, LVars, AllVars),
cnf_to_file(CNF, AllVars, S), cnf_to_file(CNF, AllVars, S),
close(S), close(S),
% execute c2d at this point, but we're lazy % execute c2d at this point, but we're lazy
@ -112,7 +111,7 @@ ddnnf(List, Vars, Exs, LVars, DDNNF) :-
open('dimacs.nnf',read,R), open('dimacs.nnf',read,R),
SVars =.. [v|AllVars], SVars =.. [v|AllVars],
% ones(LVars), % ones(LVars),
input_ddnnf(R, SVars, MVars, DDNNF), input_ddnnf(R, SVars, PVs, DDNNF),
close(R). close(R).
exps2conj((C1,C2), CC1*CC2) :- !, exps2conj((C1,C2), CC1*CC2) :- !,
@ -163,47 +162,47 @@ output_cnf([V|CNF], S) :-
format(S, '~d ',[V]), format(S, '~d ',[V]),
output_cnf(CNF, S). output_cnf(CNF, S).
input_ddnnf(Stream, SVars, Exs, ddnnf(Out, SVars, Result)) :- input_ddnnf(Stream, SVars, PVs, ddnnf(Out, SVars, Result)) :-
read_line_to_codes(Stream, Header), read_line_to_codes(Stream, Header),
split(Header, ["nnf",VS,_ES,_NS]), split(Header, ["nnf",VS,_ES,_NS]),
number_codes(NVs, VS), number_codes(NVs, VS),
functor(TempResults, nnf, NVs), functor(TempResults, nnf, NVs),
process_nnf_lines(Stream, SVars, Exs, 1, TempResults, Out, Last), process_nnf_lines(Stream, SVars, PVs, 1, TempResults, Out, Last),
Last1 is Last-1, Last1 is Last-1,
arg(Last1, TempResults, Result). arg(Last1, TempResults, Result).
process_nnf_lines(Stream, SVars, Exs, LineNumber, TempResults, O, LL) :- process_nnf_lines(Stream, SVars, PVs, LineNumber, TempResults, O, LL) :-
read_line_to_codes(Stream, Codes), read_line_to_codes(Stream, Codes),
( Codes = end_of_file -> O = [], LL = LineNumber ; ( Codes = end_of_file -> O = [], LL = LineNumber ;
% (LineNumber > 1 -> N is LineNumber-1, arg(N,TempResults,P), format("~w ",[P]);true), % (LineNumber > 1 -> N is LineNumber-1, arg(N,TempResults,P), format("~w ",[P]);true),
% format("~s~n",[Codes]), % format("~s~n",[Codes]),
arg(LineNumber, TempResults, P), arg(LineNumber, TempResults, P),
process_nnf_line(SVars, Exs, TempResults, Exp0, Codes, []), process_nnf_line(SVars, PVs, TempResults, Exp0, Codes, []),
simplify_line(P=Exp0, Lines, O), simplify_line(P=Exp0, Lines, O),
NewLine is LineNumber+1, NewLine is LineNumber+1,
process_nnf_lines(Stream, SVars, Exs, NewLine, TempResults, Lines, LL) process_nnf_lines(Stream, SVars, PVs, NewLine, TempResults, Lines, LL)
). ).
process_nnf_line(SVars, Exs, _TempResults, Exp) --> "L ", process_nnf_line(SVars, PVs, _TempResults, Exp) --> "L ",
nnf_leaf(SVars, Exs, Exp). nnf_leaf(SVars, PVs, Exp).
process_nnf_line(_SVars, _, TempResults, Exp) --> "A ", process_nnf_line(_SVars, _, TempResults, Exp) --> "A ",
nnf_and_node(TempResults, Exp). nnf_and_node(TempResults, Exp).
process_nnf_line(_SVars, _, TempResults, Exp) --> "O ", process_nnf_line(_SVars, _, TempResults, Exp) --> "O ",
nnf_or_node(TempResults, Exp). nnf_or_node(TempResults, Exp).
nnf_leaf(SVars, Exs, Prob, Codes, []) :- nnf_leaf(SVars, PVs, Prob, Codes, []) :-
number_codes(Number, Codes), number_codes(Number, Codes),
Abs is abs(Number), Abs is abs(Number),
arg(Abs, SVars, Node), arg(Abs, SVars, Node),
(Number < 0 -> (Number < 0 ->
(existential(Node,Exs) -> Prob = 1 ; Prob = 1-Node ) (parameter(Node,PVs) -> Prob = 1-Node ; Prob = 1 )
; ;
Prob = Node Prob = Node
). ).
existential(F,[F1|Exs]) :- F == F1, !. parameter(F,[F1|_Exs]) :- F == F1, !.
existential(F,[_|Exs]) :- parameter(F,[_|Exs]) :-
existential(F, Exs). parameter(F, Exs).
nnf_and_node(TempResults, Product, Codes, []) :- nnf_and_node(TempResults, Product, Codes, []) :-
split(Codes, [_|NumberAsStrings]), split(Codes, [_|NumberAsStrings]),
@ -246,7 +245,9 @@ propagate_constants(Exp, A, Lines, [(A=Exp)|Lines]).
% compute the value of a SP % compute the value of a SP
% %
% %
ddnnf_is(ddnnf(F, _Vs, Out), Out) :- ddnnf_is(ddnnf(F, Vs, Out), Out) :-
term_variables(Vs,LVs),
ones(LVs),
%(numbervars(F,1,_),writeln(F),fail;true), %(numbervars(F,1,_),writeln(F),fail;true),
ddnnf_is_acc(F). ddnnf_is_acc(F).