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%%% -*- Mode: Prolog; -*-
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
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% $Date: 2011-11-28 14:41:26 +0100 (Mon, 28 Nov 2011) $
% $Revision: 6764 $
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%
% This file is part of ProbLog
% http://dtai.cs.kuleuven.be/problog
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% Copyright 2008, 2009, 2010
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% Theofrastos Mantadelis
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Problog Tabling: use Yap tabling for monte carlo
% use probabilistic semantics tabling for exact
% rest methods not benefited from tabling yet
%
% Look at: CICLOPS 2009 Mantadelis Theofrastos & Gerda Janssens
% SRL 2009 Angelika Kimming & Vitor
%
% Currently: Exact handles ground goals only and loops
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- module(tabling, [problog_table/1,
problog_tabled/1,
problog_neg/1,
init_tabling/0,
clear_tabling/0,
retain_tabling/0,
clear_retained_tables/0,
problog_chktabled/2,
problog_abolish_table/1,
problog_abolish_all_tables/0,
problog_tabling_negated_synonym/2,
problog_tabling_get_negated_from_pred/2,
problog_tabling_get_negated_from_id/2,
op(1150, fx, problog_table)]).
:- use_module(library(lists), [memberchk/2]).
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:- use_module(extlists, _, [open_end_memberchk/2,
open_end_add/3,
open_end_add_unique/3,
open_end_close_end/2]).
:- use_module(flags, _, [problog_define_flag/4, problog_flag/2]).
:- use_module(ptree, _, [init_ptree/1,
delete_ptree/1,
merge_ptree/2,
empty_ptree/1]).
:- op( 1150, fx, problog_table ).
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:- meta_predicate(problog_table(0)).
:- meta_predicate(problog_neg(0)).
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:- dynamic(problog_tabled/1).
:- dynamic(has_synonyms/0).
:- dynamic(problog_tabling_retain/1).
:- initialization((
problog_define_flag(max_depth, problog_flag_validate_integer, 'maximum proof depth', -1),
problog_define_flag(retain_tables, problog_flag_validate_boolean, 'retain tables after query', false)
)).
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init_tabling :-
nb_setval(problog_current_depth, 0),
nb_setval(problog_suspended_tries, []),
nb_setval(problog_current_ptree, problog_completed_proofs),
nb_setval(problog_nested_tries, false),
nb_setval(problog_tabling_next_index, 1).
clear_tabling:-
nb_setval(problog_suspended_tries, []),
nb_setval(problog_current_ptree, 1),
nb_setval(problog_nested_tries, false),
nb_setval(problog_tabling_next_index, 1),
forall(problog_chktabled(_, Trie),
(problog_tabling_retain(Trie) ->
true
;
delete_ptree(Trie)
)
),
eraseall(problog_table), !.
clear_tabling.
retain_tabling:-
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forall(problog_chktabled(_, Trie), assertz(problog_tabling_retain(Trie))).
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clear_retained_tables:-
forall(problog_tabling_retain(Trie), delete_ptree(Trie)),
retractall(problog_tabling_retain(_)).
problog_chktabled(Index, Trie):-
recorded(problog_table, store(_, Index, Trie, _, _), _).
problog_table_next_index(Index):-
nb_getval(problog_tabling_next_index, Index),
NIndex is Index + 1,
nb_setval(problog_tabling_next_index, NIndex).
problog_table(M:P) :- !,
problog_table(P, M).
problog_table(P) :-
prolog_load_context(module, M),
problog_table(P, M).
problog_table(M:P, _) :-
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problog_table(P, M).
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problog_table((P1, P2), M) :-
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problog_table(P1, M),
problog_table(P2, M).
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problog_table(Name/Arity, Module) :-
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length(Args,Arity),
Head =.. [Name|Args],
\+ predicate_property(Module:Head, dynamic), !,
throw(error('problog_table: Problog tabling currently requires the predicate to be declared dynamic and compiles it to static.')).
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problog_table(Name/Arity, Module) :-
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length(Args,Arity),
Head =.. [Name|Args],
atom_concat(['problog_', Name, '_original'], OriginalName),
atom_concat(['problog_', Name, '_mctabled'], MCName),
atom_concat(['problog_', Name, '_tabled'], ExactName),
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% Monte carlo tabling
catch((table(Module:MCName/Arity),
assertz(problog_tabled(Module:Name/Arity))), _,
(format(user_error, 'Warning: Tabling was not enabled over compilation, montecarlo tabling is disabled!~nPredicate: ~q~n', [Module:MCName/Arity]))),
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findall(_,(
OriginalPred =.. [OriginalName|Args],
MCPred =.. [MCName|Args],
retract(Module:(Head:-Body)),
assert_static(Module:(OriginalPred:-Body)),
assert_static(Module:(MCPred:-Body))
),_),
OriginalPred =.. [OriginalName|Args],
MCPred =.. [MCName|Args],
ExactPred =.. [ExactName|Args],
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assertz(Module:(
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Head:-
(problog:problog_control(check, exact) ->
ExactPred
; problog:problog_control(check, mc) ->
MCPred
;
OriginalPred
)
)),
% Exact method tabling
assert_static((
Module:ExactPred :-
(user:problog_user_ground(Head) ->
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nb_setval(problog_nested_tries, true),
get_negated_synonym_state(OriginalPred, State),
(State = false ->
true
;
(recorded(problog_table, store(OriginalPred, Hash, HashTrie, SuspTrie, Finished), Ref)->
(Finished = false ->
b_getval(problog_suspended_tries, Susp),
b_setval(problog_suspended_tries, [Hash|Susp])
;
Finished
),
b_getval(problog_current_proof, IDs),
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\+ open_end_memberchk(not(t(Hash)), IDs),
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open_end_add_unique(t(Hash), IDs, NIDs),
b_setval(problog_current_proof, NIDs)
;
b_getval(problog_current_proof, OIDs),
b_getval(problog_current_ptree, CurrentControlTrie),
b_getval(CurrentControlTrie, OCurTrie),
init_ptree(HashTrie),
init_ptree(SuspTrie),
b_setval(problog_current_proof, []),
b_setval(CurrentControlTrie, HashTrie),
problog_table_next_index(Hash),
recordz(problog_table, store(OriginalPred, Hash, HashTrie, SuspTrie, false), Ref),
problog_flag(max_depth, MaxDepth),
(MaxDepth > 0 ->
nb_getval(problog_current_depth, CurDepth)
;
CurDepth is MaxDepth - 1
),
(CurDepth < MaxDepth ->
NewDepth is CurDepth + 1,
b_setval(problog_current_depth, NewDepth),
findall(_, (
Module:OriginalPred,
b_getval(problog_suspended_tries, Susp),
(memberchk(Hash, Susp) ->
b_setval(CurrentControlTrie, SuspTrie) % maybe necessary to remove hash from susp
;
true
),
problog:add_solution
), _) % eager goal proofing (easier to expand for non-ground version)
;
/* (empty_ptree(HashTrie) ->
erase(Ref),
fail
;
true
)*/
true
),
erase(Ref),
(empty_ptree(HashTrie) ->
recordz(problog_table, store(OriginalPred, Hash, HashTrie, SuspTrie, fail), _NRef),
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delete_ptree(SuspTrie) %,
%fail % no justification exists
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;
recordz(problog_table, store(OriginalPred, Hash, HashTrie, SuspTrie, true), _NRef),
merge_ptree(HashTrie, SuspTrie),
delete_ptree(SuspTrie)
),
b_setval(CurrentControlTrie, OCurTrie),
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\+ open_end_memberchk(not(t(Hash)), OIDs),
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open_end_add_unique(t(Hash), OIDs, NOIDs),
b_setval(problog_current_proof, NOIDs)
)
)
;
% writeln(non_ground),
Module:OriginalPred
)
)).
problog_abolish_all_tables:-
abolish_all_tables.
problog_abolish_table(M:P/A):-
atom_concat(['problog_', P, '_mctabled'], MCName),
abolish_table(M:MCName/A).
% supports exact, monte-carlo, requires expansion of tabling for rest methods
problog_neg(M:G):-
problog:problog_control(check, exact),
functor(G, Name, Arity),
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\+ problog_tabled(M:Name/Arity),
\+ problog:problog_predicate(Name, Arity),
\+ (Name == problog_neg, Arity == 1),
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throw(problog_neg_error('Error: goal must be dynamic and tabled', M:G)).
problog_neg(M:G):-
% exact inference
problog:problog_control(check, exact),
b_getval(problog_current_proof, IDs),
b_setval(problog_current_proof, []),
M:G,
b_getval(problog_current_proof, L),
open_end_close_end(L, [Trie]),
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\+ open_end_memberchk(Trie, IDs),
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open_end_add_unique(not(Trie), IDs, NIDs),
b_setval(problog_current_proof, NIDs).
problog_neg(M:G):-
% monte carlo sampling
problog:problog_control(check, mc),
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\+ M:G.
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% This predicate assigns a synonym for negation that means: NotName = problog_neg(Name)
problog_tabling_negated_synonym(Name, NotName):-
recorded(problog_table_synonyms, negated(Name, NotName), _), !.
problog_tabling_negated_synonym(Name, NotName):-
retractall(has_synonyms),
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assertz(has_synonyms),
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recordz(problog_table_synonyms, negated(Name, NotName), _).
problog_tabling_get_negated_from_pred(Pred, Ref):-
tabling:has_synonyms,
Pred =.. [Name0|Args],
atomic_concat(problog_, Name1, Name0),
atomic_concat(Name, '_original', Name1),
(recorded(problog_table_synonyms, negated(Name, NotName1), _);
recorded(problog_table_synonyms, negated(NotName1, Name), _)),
atomic_concat([problog_, NotName1, '_original'], NotName),
NegPred =.. [NotName|Args],
recorded(problog_table, store(NegPred, _, _, _, _), Ref), !.
problog_tabling_get_negated_from_id(ID, Ref):-
tabling:has_synonyms,
recorded(problog_table, store(Pred, ID, _, _, _), _),
Pred =.. [Name0|Args],
atomic_concat(problog_, Name1, Name0),
atomic_concat(Name, '_original', Name1),
(recorded(problog_table_synonyms, negated(Name, NotName1), _);
recorded(problog_table_synonyms, negated(NotName1, Name), _)),
atomic_concat([problog_, NotName1, '_original'], NotName),
NegPred =.. [NotName|Args],
recorded(problog_table, store(NegPred, _, _, _, _), Ref), !.
get_negated_synonym_state(Pred, Fin):-
tabling:has_synonyms,
Pred =.. [Name0|Args],
atomic_concat(problog_, Name1, Name0),
atomic_concat(Name, '_original', Name1),
(recorded(problog_table_synonyms, negated(Name, NotName1), _);
recorded(problog_table_synonyms, negated(NotName1, Name), _)),
atomic_concat([problog_, NotName1, '_original'], NotName),
NegPred =.. [NotName|Args],
recorded(problog_table, store(NegPred, _, _, _, Fin), _), !.
get_negated_synonym_state(_, true).
/*
get_negated_synonym_id(ID, NegID):-
tabling:has_synonyms,
recorded(problog_table, store(Pred, ID, _, _, _), _),
Pred =.. [Name0|Args],
atomic_concat(problog_, Name1, Name0),
atomic_concat(Name, '_original', Name1),
(recorded(problog_table_synonyms, negated(Name, NotName1), _);
recorded(problog_table_synonyms, negated(NotName1, Name), _)),
atomic_concat([problog_, NotName1, '_original'], NotName),
NegPred =.. [NotName|Args],
recorded(problog_table, store(NegPred, NegID, _, _, _), _).
*/