This repository has been archived on 2023-08-20. You can view files and clone it, but cannot push or open issues or pull requests.
yap-6.3/packages/ProbLog/problog/variable_elimination.yap
Vítor Santos Costa ed0d3f6cae Latest ProbLog
2012-01-11 14:44:59 +00:00

426 lines
15 KiB
Prolog

%%% -*- Mode: Prolog; -*-
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% $Date: 2011-11-28 14:41:26 +0100 (Mon, 28 Nov 2011) $
% $Revision: 6764 $
%
% This file is part of ProbLog
% http://dtai.cs.kuleuven.be/problog
%
% ProbLog was developed at Katholieke Universiteit Leuven
%
% Copyright 2008, 2009, 2010
% Katholieke Universiteit Leuven
%
% Main authors of this file:
% Theofrastos Mantadelis
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Artistic License 2.0
%
% Copyright (c) 2000-2006, The Perl Foundation.
%
% Everyone is permitted to copy and distribute verbatim copies of this
% license document, but changing it is not allowed. Preamble
%
% This license establishes the terms under which a given free software
% Package may be copied, modified, distributed, and/or
% redistributed. The intent is that the Copyright Holder maintains some
% artistic control over the development of that Package while still
% keeping the Package available as open source and free software.
%
% You are always permitted to make arrangements wholly outside of this
% license directly with the Copyright Holder of a given Package. If the
% terms of this license do not permit the full use that you propose to
% make of the Package, you should contact the Copyright Holder and seek
% a different licensing arrangement. Definitions
%
% "Copyright Holder" means the individual(s) or organization(s) named in
% the copyright notice for the entire Package.
%
% "Contributor" means any party that has contributed code or other
% material to the Package, in accordance with the Copyright Holder's
% procedures.
%
% "You" and "your" means any person who would like to copy, distribute,
% or modify the Package.
%
% "Package" means the collection of files distributed by the Copyright
% Holder, and derivatives of that collection and/or of those files. A
% given Package may consist of either the Standard Version, or a
% Modified Version.
%
% "Distribute" means providing a copy of the Package or making it
% accessible to anyone else, or in the case of a company or
% organization, to others outside of your company or organization.
%
% "Distributor Fee" means any fee that you charge for Distributing this
% Package or providing support for this Package to another party. It
% does not mean licensing fees.
%
% "Standard Version" refers to the Package if it has not been modified,
% or has been modified only in ways explicitly requested by the
% Copyright Holder.
%
% "Modified Version" means the Package, if it has been changed, and such
% changes were not explicitly requested by the Copyright Holder.
%
% "Original License" means this Artistic License as Distributed with the
% Standard Version of the Package, in its current version or as it may
% be modified by The Perl Foundation in the future.
%
% "Source" form means the source code, documentation source, and
% configuration files for the Package.
%
% "Compiled" form means the compiled bytecode, object code, binary, or
% any other form resulting from mechanical transformation or translation
% of the Source form.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Permission for Use and Modification Without Distribution
%
% (1) You are permitted to use the Standard Version and create and use
% Modified Versions for any purpose without restriction, provided that
% you do not Distribute the Modified Version.
%
% Permissions for Redistribution of the Standard Version
%
% (2) You may Distribute verbatim copies of the Source form of the
% Standard Version of this Package in any medium without restriction,
% either gratis or for a Distributor Fee, provided that you duplicate
% all of the original copyright notices and associated disclaimers. At
% your discretion, such verbatim copies may or may not include a
% Compiled form of the Package.
%
% (3) You may apply any bug fixes, portability changes, and other
% modifications made available from the Copyright Holder. The resulting
% Package will still be considered the Standard Version, and as such
% will be subject to the Original License.
%
% Distribution of Modified Versions of the Package as Source
%
% (4) You may Distribute your Modified Version as Source (either gratis
% or for a Distributor Fee, and with or without a Compiled form of the
% Modified Version) provided that you clearly document how it differs
% from the Standard Version, including, but not limited to, documenting
% any non-standard features, executables, or modules, and provided that
% you do at least ONE of the following:
%
% (a) make the Modified Version available to the Copyright Holder of the
% Standard Version, under the Original License, so that the Copyright
% Holder may include your modifications in the Standard Version. (b)
% ensure that installation of your Modified Version does not prevent the
% user installing or running the Standard Version. In addition, the
% modified Version must bear a name that is different from the name of
% the Standard Version. (c) allow anyone who receives a copy of the
% Modified Version to make the Source form of the Modified Version
% available to others under (i) the Original License or (ii) a license
% that permits the licensee to freely copy, modify and redistribute the
% Modified Version using the same licensing terms that apply to the copy
% that the licensee received, and requires that the Source form of the
% Modified Version, and of any works derived from it, be made freely
% available in that license fees are prohibited but Distributor Fees are
% allowed.
%
% Distribution of Compiled Forms of the Standard Version or
% Modified Versions without the Source
%
% (5) You may Distribute Compiled forms of the Standard Version without
% the Source, provided that you include complete instructions on how to
% get the Source of the Standard Version. Such instructions must be
% valid at the time of your distribution. If these instructions, at any
% time while you are carrying out such distribution, become invalid, you
% must provide new instructions on demand or cease further
% distribution. If you provide valid instructions or cease distribution
% within thirty days after you become aware that the instructions are
% invalid, then you do not forfeit any of your rights under this
% license.
%
% (6) You may Distribute a Modified Version in Compiled form without the
% Source, provided that you comply with Section 4 with respect to the
% Source of the Modified Version.
%
% Aggregating or Linking the Package
%
% (7) You may aggregate the Package (either the Standard Version or
% Modified Version) with other packages and Distribute the resulting
% aggregation provided that you do not charge a licensing fee for the
% Package. Distributor Fees are permitted, and licensing fees for other
% components in the aggregation are permitted. The terms of this license
% apply to the use and Distribution of the Standard or Modified Versions
% as included in the aggregation.
%
% (8) You are permitted to link Modified and Standard Versions with
% other works, to embed the Package in a larger work of your own, or to
% build stand-alone binary or bytecode versions of applications that
% include the Package, and Distribute the result without restriction,
% provided the result does not expose a direct interface to the Package.
%
% Items That are Not Considered Part of a Modified Version
%
% (9) Works (including, but not limited to, modules and scripts) that
% merely extend or make use of the Package, do not, by themselves, cause
% the Package to be a Modified Version. In addition, such works are not
% considered parts of the Package itself, and are not subject to the
% terms of this license.
%
% General Provisions
%
% (10) Any use, modification, and distribution of the Standard or
% Modified Versions is governed by this Artistic License. By using,
% modifying or distributing the Package, you accept this license. Do not
% use, modify, or distribute the Package, if you do not accept this
% license.
%
% (11) If your Modified Version has been derived from a Modified Version
% made by someone other than you, you are nevertheless required to
% ensure that your Modified Version complies with the requirements of
% this license.
%
% (12) This license does not grant you the right to use any trademark,
% service mark, tradename, or logo of the Copyright Holder.
%
% (13) This license includes the non-exclusive, worldwide,
% free-of-charge patent license to make, have made, use, offer to sell,
% sell, import and otherwise transfer the Package with respect to any
% patent claims licensable by the Copyright Holder that are necessarily
% infringed by the Package. If you institute patent litigation
% (including a cross-claim or counterclaim) against any party alleging
% that the Package constitutes direct or contributory patent
% infringement, then this Artistic License to you shall terminate on the
% date that such litigation is filed.
%
% (14) Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT
% HOLDER AND CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED
% WARRANTIES. THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
% PARTICULAR PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED TO THE EXTENT
% PERMITTED BY YOUR LOCAL LAW. UNLESS REQUIRED BY LAW, NO COPYRIGHT
% HOLDER OR CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT, INDIRECT,
% INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY OUT OF THE USE
% OF THE PACKAGE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- module(variable_elimination, [trie_check_for_and_cluster/1, trie_replace_and_cluster/2, clean_up/0, variable_elimination_stats/3]).
:- use_module(library(lists), [append/3, delete/3, memberchk/2, reverse/2]).
:- use_module(library(tries)).
:- use_module('flags', _, [problog_define_flag/5]).
:- initialization((
nb_setval(prob_fact_count, 0),
problog_define_flag(variable_elimination, problog_flag_validate_boolean, 'enable variable elimination', false, variable_elimination)
)).
bit_encode(L, ON):-
bit_encode(L, ON, 0).
bit_encode([], ON, ON):-!.
bit_encode([PF|T], ON, Acc):-
(recorded(variable_elimination, prob_fact(PF, ID), _) ->
true
;
nb_getval(prob_fact_count, ID),
NID is ID + 1,
nb_setval(prob_fact_count, NID),
recordz(variable_elimination, prob_fact(PF, ID), _)
),
NAcc is Acc \/ (1 << ID),
bit_encode(T, ON, NAcc).
bit_decode(ON, L):-
bit_decode(ON, 0, L).
bit_decode(_, ID, []):-
nb_getval(prob_fact_count, ID), !.
bit_decode(ON, ID, [PF|L]):-
0 < ON /\ (1 << ID),
recorded(variable_elimination, prob_fact(PF, ID), _),
NID is ID + 1,
bit_decode(ON, NID, L).
bit_decode(ON, ID, L):-
NID is ID + 1,
bit_decode(ON, NID, L).
update_table(T, ON, NT):-
update_table(T, ON, NT, 0).
update_table([], _ON, [], _).
update_table([H|T], ON, [NH|NT], Row):-
0 is ON /\ (1 << Row), !,
NH is H /\ \ ON, % this is an optional improvement
NRow is Row + 1,
update_table(T, ON, NT, NRow).
update_table([H|T], ON, [NH|NT], Row):-
NH is H /\ ON,
NRow is Row + 1,
update_table(T, ON, NT, NRow).
make_mask(FromBit, ToBit, Mask):-
Mask is (1 << (ToBit + 1) - 1) - (1 << FromBit - 1).
make_table(_, 0, []):-!.
make_table(ON, T, [ON|L]):-
NT is T - 1,
make_table(ON, NT, L).
modify_table(L, OT, NT):-
nb_getval(prob_fact_count, OLS),
bit_encode(L, ON),
nb_getval(prob_fact_count, NLS),
update_table(OT, ON, L1),
D is NLS - OLS,
make_mask(OLS, NLS, M),
NON is M /\ ON,
make_table(NON, D, L2),
append(L1, L2, NT).
examin(T):-
examin(T, 0).
examin([], _Row).
examin([H|T], Row):-
N is 1 << Row,
0 is H /\ (N - 1),
0 < H - N, !,
bit_decode(H, L),
calc_prob_AND_cluster(L, P),
make_prob_fact(L, P, ID),
recordz(variable_elimination, and_cluster(L, ID), _),
NRow is Row + 1,
examin(T, NRow).
examin([_H|T], Row):-
NRow is Row + 1,
examin(T, NRow).
trie_check_for_and_cluster(T):-
tries:trie_traverse_first(T, E), !,
trie_check_for_and_cluster(E, []).
trie_check_for_and_cluster(_T).
trie_check_for_and_cluster(E, T):-
tries:trie_traverse_next(E, N), !,
tries:trie_get_entry(E, L),
modify_table(L, T, NT),
trie_check_for_and_cluster(N, NT).
trie_check_for_and_cluster(E, T):-
tries:trie_get_entry(E, L),
modify_table(L, T, NT),
examin(NT), !.
trie_replace_and_cluster(To, Tn):-
tries:trie_open(Tn),
trie_replace_and_cluster_do(To, Tn).
trie_replace_and_cluster_do(To, Tn):-
trie_traverse(To, E),
trie_get_entry(E, L),
findall(Cluster/VarName, recorded(variable_elimination, and_cluster(Cluster, VarName), _), Clusters),
foreach(Clusters, NewL, L),
trie_put_entry(Tn, NewL, _),
fail.
trie_replace_and_cluster_do(_To, _Tn).
foreach([], L, L).
foreach([Cluster/VarName|Rest], L, Acc):-
check_replace_cluster(Cluster, VarName, Acc, NL),
foreach(Rest, L, NL).
check_replace_cluster(Cluster, _VarName, L, L):-
nocluster(Cluster, L), !.
check_replace_cluster(Cluster, VarName, L, NewL):-
replace_cluster(Cluster, VarName, L, NewL).
replace_cluster(Cluster, VarName, L, Res):-
first_cluster_element(L, Cluster, First),
replace(L, First, VarName, NL),
delete(Cluster, First, RestCluster),
eliminate_list(RestCluster, NL, Res),
!.
replace_cluster(Cluster, VarName, _L, _Res):-
throw(error(Cluster, VarName)).
replace_cluster2(Cluster, VarName, L, Res):-
eliminate_list(Cluster, L, NL),
append(NL, [VarName], Res),
!.
replace_cluster2(Cluster, VarName, _L, _Res):-
throw(error(Cluster, VarName)).
replace_cluster3(Cluster, VarName, L, Res):-
last_cluster_element(L, Cluster, Last),
replace(L, Last, VarName, NL),
delete(Cluster, Last, RestCluster),
eliminate_list(RestCluster, NL, Res),
!.
replace_cluster3(Cluster, VarName, _L, _Res):-
throw(error(Cluster, VarName)).
first_cluster_element([], _, _).
first_cluster_element([H|_T], Cluster, H):-
memberchk(H, Cluster), !.
first_cluster_element([_H|T], Cluster, R):-
first_cluster_element(T, Cluster, R).
last_cluster_element(L, Cluster, R):-
reverse(L, RL),
first_cluster_element(RL, Cluster, R).
nocluster([], _).
nocluster([H|T], L):-
\+ memberchk(H, L),
nocluster(T, L).
eliminate_list([], L, L).
eliminate_list([H|T], L, Res):-
memberchk(H, L),
delete(L, H, NL),
eliminate_list(T, NL, Res).
replace([], _, _, []).
replace([H|T], H, NH, [NH|NT]):-
replace(T, H, NH, NT).
replace([H|T], R, NR, [H|NT]):-
H \== R,
replace(T, R, NR, NT).
clean_up:-
eraseall(variable_elimination),
nb_setval(prob_fact_count, 0).
variable_elimination_stats(Clusters, OrigPF, CompPF):-
nb_getval(prob_fact_count, OrigPF),
findall(L, (recorded(variable_elimination, and_cluster(Cluster, _), _), length(Cluster, L)), LL),
sum_list(LL, EliminatedPF),
length(LL, Clusters),
CompPF is OrigPF - EliminatedPF + Clusters.
calc_prob_AND_cluster(L, P):-
multiply_list(L, P, 1.0).
multiply_list([], P, P).
multiply_list([H|T], Pr, A):-
problog:get_fact_probability(H, P),
number(P),
NA is A * P,
multiply_list(T, Pr, NA).
make_prob_fact(L, P, ID):-
(clause(problog:problog_var_elimination(ID, L, _), true) ->
true
;
problog:probclause_id(ID),
assert_static(problog:prob_for_id(ID, P, _)),
(clause(problog:problog_predicate(var_elimination, 1), true) ->
true
;
assertz(problog:problog_predicate(var_elimination, 1))
),
assertz(problog:problog_var_elimination(ID, L, P))
).