426 lines
15 KiB
Prolog
426 lines
15 KiB
Prolog
%%% -*- Mode: Prolog; -*-
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% $Date: 2010-12-02 15:20:15 +0100 (Thu, 02 Dec 2010) $
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% $Revision: 5043 $
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%
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% This file is part of ProbLog
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% http://dtai.cs.kuleuven.be/problog
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%
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% ProbLog was developed at Katholieke Universiteit Leuven
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%
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% Copyright 2008, 2009, 2010
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% Katholieke Universiteit Leuven
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%
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% Main authors of this file:
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% Theofrastos Mantadelis
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%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% Artistic License 2.0
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%
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% Copyright (c) 2000-2006, The Perl Foundation.
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%
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% Everyone is permitted to copy and distribute verbatim copies of this
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% license document, but changing it is not allowed. Preamble
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% This license establishes the terms under which a given free software
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% Package may be copied, modified, distributed, and/or
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% keeping the Package available as open source and free software.
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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:- module(variable_elimination, [trie_check_for_and_cluster/1, trie_replace_and_cluster/2, clean_up/0, variable_elimination_stats/3]).
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:- use_module(library(lists), [append/3, delete/3, memberchk/2, reverse/2]).
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:- use_module(library(tries)).
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:- use_module('flags', _, [problog_define_flag/5]).
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:- initialization((
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nb_setval(prob_fact_count, 0),
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problog_define_flag(variable_elimination, problog_flag_validate_boolean, 'enable variable elimination', false, variable_elimination)
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)).
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bit_encode(L, ON):-
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bit_encode(L, ON, 0).
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bit_encode([], ON, ON):-!.
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bit_encode([PF|T], ON, Acc):-
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(recorded(variable_elimination, prob_fact(PF, ID), _) ->
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true
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;
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nb_getval(prob_fact_count, ID),
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NID is ID + 1,
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nb_setval(prob_fact_count, NID),
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recordz(variable_elimination, prob_fact(PF, ID), _)
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),
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NAcc is Acc \/ (1 << ID),
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bit_encode(T, ON, NAcc).
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bit_decode(ON, L):-
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bit_decode(ON, 0, L).
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bit_decode(_, ID, []):-
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nb_getval(prob_fact_count, ID), !.
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bit_decode(ON, ID, [PF|L]):-
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0 < ON /\ (1 << ID),
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recorded(variable_elimination, prob_fact(PF, ID), _),
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NID is ID + 1,
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bit_decode(ON, NID, L).
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bit_decode(ON, ID, L):-
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NID is ID + 1,
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bit_decode(ON, NID, L).
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update_table(T, ON, NT):-
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update_table(T, ON, NT, 0).
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update_table([], _ON, [], _).
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update_table([H|T], ON, [NH|NT], Row):-
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0 is ON /\ (1 << Row), !,
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NH is H /\ \ ON, % this is an optional improvement
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NRow is Row + 1,
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update_table(T, ON, NT, NRow).
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update_table([H|T], ON, [NH|NT], Row):-
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NH is H /\ ON,
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NRow is Row + 1,
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update_table(T, ON, NT, NRow).
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make_mask(FromBit, ToBit, Mask):-
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Mask is (1 << (ToBit + 1) - 1) - (1 << FromBit - 1).
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make_table(_, 0, []):-!.
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make_table(ON, T, [ON|L]):-
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NT is T - 1,
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make_table(ON, NT, L).
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modify_table(L, OT, NT):-
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nb_getval(prob_fact_count, OLS),
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bit_encode(L, ON),
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nb_getval(prob_fact_count, NLS),
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update_table(OT, ON, L1),
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D is NLS - OLS,
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make_mask(OLS, NLS, M),
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NON is M /\ ON,
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make_table(NON, D, L2),
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append(L1, L2, NT).
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examin(T):-
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examin(T, 0).
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examin([], _Row).
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examin([H|T], Row):-
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N is 1 << Row,
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0 is H /\ (N - 1),
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0 < H - N, !,
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bit_decode(H, L),
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calc_prob_AND_cluster(L, P),
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make_prob_fact(L, P, ID),
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recordz(variable_elimination, and_cluster(L, ID), _),
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NRow is Row + 1,
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examin(T, NRow).
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examin([_H|T], Row):-
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NRow is Row + 1,
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examin(T, NRow).
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trie_check_for_and_cluster(T):-
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tries:trie_traverse_first(T, E), !,
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trie_check_for_and_cluster(E, []).
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trie_check_for_and_cluster(_T).
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trie_check_for_and_cluster(E, T):-
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tries:trie_traverse_next(E, N), !,
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tries:trie_get_entry(E, L),
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modify_table(L, T, NT),
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trie_check_for_and_cluster(N, NT).
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trie_check_for_and_cluster(E, T):-
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tries:trie_get_entry(E, L),
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modify_table(L, T, NT),
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examin(NT), !.
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trie_replace_and_cluster(To, Tn):-
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tries:trie_open(Tn),
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trie_replace_and_cluster_do(To, Tn).
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trie_replace_and_cluster_do(To, Tn):-
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trie_traverse(To, E),
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trie_get_entry(E, L),
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findall(Cluster/VarName, recorded(variable_elimination, and_cluster(Cluster, VarName), _), Clusters),
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foreach(Clusters, NewL, L),
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trie_put_entry(Tn, NewL, _),
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fail.
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trie_replace_and_cluster_do(_To, _Tn).
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foreach([], L, L).
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foreach([Cluster/VarName|Rest], L, Acc):-
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check_replace_cluster(Cluster, VarName, Acc, NL),
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foreach(Rest, L, NL).
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check_replace_cluster(Cluster, _VarName, L, L):-
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nocluster(Cluster, L), !.
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check_replace_cluster(Cluster, VarName, L, NewL):-
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replace_cluster(Cluster, VarName, L, NewL).
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replace_cluster(Cluster, VarName, L, Res):-
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first_cluster_element(L, Cluster, First),
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replace(L, First, VarName, NL),
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delete(Cluster, First, RestCluster),
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eliminate_list(RestCluster, NL, Res),
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!.
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replace_cluster(Cluster, VarName, _L, _Res):-
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throw(error(Cluster, VarName)).
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replace_cluster2(Cluster, VarName, L, Res):-
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eliminate_list(Cluster, L, NL),
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append(NL, [VarName], Res),
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!.
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replace_cluster2(Cluster, VarName, _L, _Res):-
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throw(error(Cluster, VarName)).
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replace_cluster3(Cluster, VarName, L, Res):-
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last_cluster_element(L, Cluster, Last),
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replace(L, Last, VarName, NL),
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delete(Cluster, Last, RestCluster),
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eliminate_list(RestCluster, NL, Res),
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!.
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replace_cluster3(Cluster, VarName, _L, _Res):-
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throw(error(Cluster, VarName)).
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first_cluster_element([], _, _).
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first_cluster_element([H|_T], Cluster, H):-
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memberchk(H, Cluster), !.
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first_cluster_element([_H|T], Cluster, R):-
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first_cluster_element(T, Cluster, R).
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last_cluster_element(L, Cluster, R):-
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reverse(L, RL),
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first_cluster_element(RL, Cluster, R).
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nocluster([], _).
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nocluster([H|T], L):-
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\+ memberchk(H, L),
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nocluster(T, L).
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eliminate_list([], L, L).
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eliminate_list([H|T], L, Res):-
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memberchk(H, L),
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delete(L, H, NL),
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eliminate_list(T, NL, Res).
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replace([], _, _, []).
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replace([H|T], H, NH, [NH|NT]):-
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replace(T, H, NH, NT).
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replace([H|T], R, NR, [H|NT]):-
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H \== R,
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replace(T, R, NR, NT).
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clean_up:-
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eraseall(variable_elimination),
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nb_setval(prob_fact_count, 0).
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variable_elimination_stats(Clusters, OrigPF, CompPF):-
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nb_getval(prob_fact_count, OrigPF),
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findall(L, (recorded(variable_elimination, and_cluster(Cluster, _), _), length(Cluster, L)), LL),
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sum_list(LL, EliminatedPF),
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length(LL, Clusters),
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CompPF is OrigPF - EliminatedPF + Clusters.
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calc_prob_AND_cluster(L, P):-
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multiply_list(L, P, 1.0).
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multiply_list([], P, P).
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multiply_list([H|T], Pr, A):-
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problog:get_fact_probability(H, P),
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number(P),
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NA is A * P,
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multiply_list(T, Pr, NA).
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make_prob_fact(L, P, ID):-
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(clause(problog:problog_var_elimination(ID, L, _), true) ->
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true
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;
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problog:probclause_id(ID),
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assert_static(problog:prob_for_id(ID, P, _)),
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(clause(problog:problog_predicate(var_elimination, 1), true) ->
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true
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;
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assertz(problog:problog_predicate(var_elimination, 1))
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),
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assertz(problog:problog_var_elimination(ID, L, P))
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).
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