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%%% -*- Mode: Prolog; -*-
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
2010-12-16 13:30:50 +00:00
% $Date: 2010-12-16 13:33:43 +0100 (Thu, 16 Dec 2010) $
% $Revision: 5156 $
%
% This file is part of ProbLog
% http://dtai.cs.kuleuven.be/problog
%
% ProbLog was developed at Katholieke Universiteit Leuven
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% Copyright 2008, 2009, 2010
% Katholieke Universiteit Leuven
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% Main authors of this file:
% Theofrastos Mantadelis
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% nested tries handling
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- module(nestedtries, [nested_trie_to_depth_breadth_trie/4]).
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:- use_module(library(ordsets), [list_to_ord_set/2,
ord_subset/2,
ord_union/3,
ord_intersection/3]).
:- use_module(library(lists), [append/3,
memberchk/2,
delete/3]).
:- use_module(library(tries), [trie_to_depth_breadth_trie/6,
trie_get_depth_breadth_reduction_entry/1,
trie_dup/2,
trie_close/1,
trie_open/1,
trie_replace_nested_trie/3,
trie_remove_entry/1,
trie_get_entry/2,
trie_put_entry/3,
trie_traverse/2,
trie_traverse_mode/1,
trie_usage/4]).
:- use_module(flags, [problog_define_flag/5, problog_flag/2]).
:- style_check(all).
:- yap_flag(unknown,error).
:- initialization((
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problog_define_flag(subset_check, problog_flag_validate_boolean, 'perform subset check in nested tries', true, nested_tries),
problog_define_flag(loop_refine_ancs, problog_flag_validate_boolean, 'refine ancestors if no loop exists', true, nested_tries),
problog_define_flag(trie_preprocess, problog_flag_validate_boolean, 'perform a preprocess step to nested tries', false, nested_tries),
problog_define_flag(refine_anclst, problog_flag_validate_boolean, 'refine the ancestor list with their childs', false, nested_tries),
problog_define_flag(anclst_represent,problog_flag_validate_in_list([list, integer]), 'represent the ancestor list', list, nested_tries)
)).
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trie_replace_entry(_Trie, Entry, E, false):-
trie_get_entry(Entry, Proof),
memberchk(E, Proof), !,
trie_remove_entry(Entry).
trie_replace_entry(Trie, Entry, E, true):-
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trie_get_entry(Entry, Proof),
memberchk(E, Proof), !,
delete(Proof, E, NewProof),
(NewProof == [] ->
trie_delete(Trie),
trie_put_entry(Trie, [true], _)
;
trie_remove_entry(Entry),
trie_put_entry(Trie, NewProof, _)
).
trie_replace_entry(Trie, _Entry, t(ID), R):-
trie_replace_nested_trie(Trie, ID, R).
trie_delete(Trie):-
trie_traverse(Trie, R),
trie_remove_entry(R),
fail.
trie_delete(_Trie).
is_state(Variable):-
Variable == true, !.
is_state(Variable):-
Variable == false.
is_state(Variable):-
nonvar(Variable),
Variable = not(NestedVariable),
is_state(NestedVariable).
is_trie(Trie, ID):-
nonvar(Trie),
Trie = t(ID), !.
is_trie(Trie, ID):-
nonvar(Trie),
Trie = not(NestedTrie),
is_trie(NestedTrie, ID).
is_label(Label, ID):-
atom(Label), !,
atomic_concat('L', ID, Label).
is_label(Label, ID):-
nonvar(Label),
Label = not(NestedLabel),
is_label(NestedLabel, ID).
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simplify(not(false), true):- !.
simplify(not(true), false):- !.
simplify(not(not(A)), B):-
!, simplify(A, B).
simplify(A, A).
% Ancestor related stuff
initialise_ancestors(0):-
problog_flag(anclst_represent, integer).
initialise_ancestors([]):-
problog_flag(anclst_represent, list).
add_to_ancestors(ID, Ancestors, NewAncestors):-
integer(Ancestors), !,
NewAncestors is (1 << (ID - 1)) \/ Ancestors.
add_to_ancestors(ID, Ancestors, NewAncestors):-
is_list(Ancestors),
list_to_ord_set([ID|Ancestors], NewAncestors).
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ancestors_union(Ancestors1, Ancestors2, NewAncestors):-
integer(Ancestors1), !,
NewAncestors is Ancestors1 \/ Ancestors2.
ancestors_union(Ancestors1, Ancestors2, NewAncestors):-
is_list(Ancestors1),
ord_union(Ancestors1, Ancestors2, NewAncestors).
ancestor_subset_check(SubAncestors, Ancestors):-
integer(SubAncestors), !,
SubAncestors is Ancestors /\ SubAncestors.
ancestor_subset_check(SubAncestors, Ancestors):-
is_list(SubAncestors),
ord_subset(SubAncestors, Ancestors).
ancestor_loop_refine(Loop, Ancestors, 0):-
var(Loop), integer(Ancestors), !.
ancestor_loop_refine(Loop, Ancestors, []):-
var(Loop), is_list(Ancestors), !.
ancestor_loop_refine(true, Ancestors, Ancestors).
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ancestor_child_refine(true, Ancestors, Childs, NewAncestors):-
integer(Ancestors), !,
NewAncestors is Ancestors /\ Childs.
ancestor_child_refine(true, Ancestors, Childs, NewAncestors):-
is_list(Ancestors), !,
ord_intersection(Ancestors, Childs, NewAncestors).
ancestor_child_refine(false, Ancestors, _, Ancestors).
% Cycle check related stuff
% missing synonym check
cycle_check(ID, Ancestors):-
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get_negated_synonym_id(ID, SynID),
cycle_check_intern(SynID, Ancestors).
cycle_check_intern(ID, Ancestors):-
integer(Ancestors), !,
Bit is 1 << (ID - 1),
Bit is Bit /\ Ancestors.
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cycle_check_intern(ID, Ancestors):-
is_list(Ancestors),
memberchk(ID, Ancestors).
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get_negated_synonym_id(ID, ID).
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),
get_negated_name(Name, NotName1),
atomic_concat([problog_, NotName1, '_original'], NotName),
NegPred =.. [NotName|Args],
recorded(problog_table, store(NegPred, NegID, _, _, _), _).
get_negated_name(Name, NotName1):-
recorded(problog_table_synonyms, negated(Name, NotName1), _), !.
get_negated_name(Name, NotName1):-
recorded(problog_table_synonyms, negated(NotName1, Name), _).
trie_dup_reverse(Trie, DupTrie):-
trie_open(DupTrie),
trie_traverse_mode(backward),
trie_dup_rev(Trie, DupTrie),
trie_traverse_mode(forward).
trie_dup_rev(Trie, DupTrie):-
\+ trie_usage(Trie, 0, 0, 0),
trie_traverse(Trie, Entry),
trie_get_entry(Entry, Term),
trie_put_entry(DupTrie, Term, _),
fail.
trie_dup_rev(_, _).
preprocess(Index, DepthBreadthTrie, OptimizationLevel, StartCount, FinalEndCount):-
problog:problog_chktabled(Index, Trie), !,
trie_dup(Trie, CopyTrie),
initialise_ancestors(Ancestors),
make_nested_trie_base_cases(CopyTrie, t(Index), DepthBreadthTrie, OptimizationLevel, StartCount, EndCount, Ancestors),
trie_close(CopyTrie),
Next is Index + 1,
preprocess(Next, DepthBreadthTrie, OptimizationLevel, EndCount, FinalEndCount).
preprocess(_, _, _, FinalEndCount, FinalEndCount).
make_nested_trie_base_cases(Trie, t(ID), DepthBreadthTrie, OptimizationLevel, StartCount, FinalEndCount, Ancestors):-
trie_to_depth_breadth_trie(Trie, DepthBreadthTrie, Label, OptimizationLevel, StartCount, EndCount),
(is_trie(Label, SID) ->
trie_get_depth_breadth_reduction_entry(NestedEntry),
trie_replace_entry(Trie, NestedEntry, Label, false),
add_to_ancestors(SID, Ancestors, NewAncestors),
make_nested_trie_base_cases(Trie, t(ID), DepthBreadthTrie, OptimizationLevel, EndCount, FinalEndCount, NewAncestors)
;
FinalEndCount = EndCount,
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set_trie(ID, Label, Ancestors)
).
nested_trie_to_depth_breadth_trie(Trie, DepthBreadthTrie, FinalLabel, OptimizationLevel):-
integer(OptimizationLevel),
trie_open(DepthBreadthTrie),
(problog_flag(trie_preprocess, true) ->
preprocess(1, DepthBreadthTrie, OptimizationLevel, 0, StartCount)
;
StartCount = 0
),
initialise_ancestors(Ancestors),
(problog_flag(loop_refine_ancs, true) ->
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trie_2_dbtrie_init(Trie, DepthBreadthTrie, OptimizationLevel, StartCount, _, Ancestors, FinalLabel, _, _Childs)
;
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trie_2_dbtrie_init(Trie, DepthBreadthTrie, OptimizationLevel, StartCount, _, Ancestors, FinalLabel, true, _Childs)
),
eraseall(problog_trie_table).
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trie_2_dbtrie_init(ID, DepthBreadthTrie, OptimizationLevel, StartCount, EndCount, Ancestors, Label, ContainLoop, FinalChilds):-
initialise_ancestors(Childs),
get_trie_pointer(ID, Trie),
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trie_dup_reverse(Trie, CopyTrie),
trie_2_dbtrie_intern(CopyTrie, DepthBreadthTrie, OptimizationLevel, StartCount, EndCount, Ancestors, Label, ContainLoop, Childs, FinalChilds),
trie_close(CopyTrie).
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trie_2_dbtrie_intern(Trie, DepthBreadthTrie, OptimizationLevel, StartCount, FinalEndCount, Ancestors, TrieLabel, ContainLoop, Childs, FinalChilds):-
trie_to_depth_breadth_trie(Trie, DepthBreadthTrie, Label, OptimizationLevel, StartCount, EndCount),
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(is_trie(Label, ID) ->
problog_flag(refine_anclst, ChildRefineAncestors),
trie_get_depth_breadth_reduction_entry(NestedEntry),
(cycle_check(ID, Ancestors) ->
ContainLoop = true,
NewLabel = false,
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NewEndCount = EndCount,
initialise_ancestors(GrandChilds)
; get_trie(ID, NewLabel, Ancestors) ->
GrandChilds = Ancestors,
NewEndCount = EndCount
;
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add_to_ancestors(ID, Ancestors, NewAncestors),
trie_2_dbtrie_init(ID, DepthBreadthTrie, OptimizationLevel, EndCount, NewEndCount, NewAncestors, DerefLabel, NewContainLoop, GrandChilds),
ancestor_loop_refine(NewContainLoop, Ancestors, RefinedAncestors1),
ancestor_child_refine(ChildRefineAncestors, RefinedAncestors1, GrandChilds, RefinedAncestors),
simplify(DerefLabel, NewLabel),
set_trie(ID, NewLabel, RefinedAncestors),
ContainLoop = NewContainLoop
),
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trie_replace_entry(Trie, NestedEntry, t(ID), NewLabel),
(ChildRefineAncestors ->
add_to_ancestors(ID, Childs, NewChilds1),
ancestors_union(NewChilds1, GrandChilds, NewChilds)
;
NewChilds = Childs
),
trie_2_dbtrie_intern(Trie, DepthBreadthTrie, OptimizationLevel, NewEndCount, FinalEndCount, Ancestors, TrieLabel, ContainLoop, NewChilds, FinalChilds)
;
FinalEndCount = EndCount,
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TrieLabel = Label,
FinalChilds = Childs
).
% predicate to check/remember resolved tries
get_trie_pointer(ID, Trie):-
problog:problog_chktabled(ID, Trie), !.
get_trie_pointer(Trie, Trie).
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get_trie(Trie, Label, Ancestors):-
problog_flag(subset_check, true), !,
recorded(problog_trie_table, store(Trie, StoredAncestors, Label), _),
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ancestor_subset_check(StoredAncestors, Ancestors).
get_trie(Trie, Label, Ancestors):-
recorded(problog_trie_table, store(Trie, StoredAncestors, Label), _),
StoredAncestors == Ancestors.
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set_trie(Trie, Label, Ancestors):-
recordz(problog_trie_table, store(Trie, Ancestors, Label), _).