424 lines
17 KiB
Prolog
424 lines
17 KiB
Prolog
%%% -*- Mode: Prolog; -*-
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% $Date: 2010-11-03 19:13:53 +0100 (Wed, 03 Nov 2010) $
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% $Revision: 4986 $
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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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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% nested tries handling
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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:- 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]). % this two might be better to do a custom fast implementation
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:- use_module(library(lists), [memberchk/2, delete/3]).
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:- 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]).
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:- use_module(flags, [problog_define_flag/5, problog_flag/2]).
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:- style_check(all).
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:- yap_flag(unknown,error).
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:- initialization((
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% problog_define_flag(subset_check, problog_flag_validate_boolean, 'perform subset check in nested tries', true, nested_tries),
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problog_define_flag(loop_refine_ancs, problog_flag_validate_boolean, 'refine ancestors if no loop exists', true, nested_tries)
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% problog_define_flag(trie_preprocess, problog_flag_validate_boolean, 'perform a preprocess step to nested tries', false, nested_tries),
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% problog_define_flag(refine_anclst, problog_flag_validate_boolean, 'refine the ancestor list with their childs', false, nested_tries),
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% problog_define_flag(anclst_represent,problog_flag_validate_in_list([list, integer]), 'represent the ancestor list', list, nested_tries)
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)).
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trie_replace_entry(_Trie, Entry, _E, false):-
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!, trie_remove_entry(Entry).
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trie_replace_entry(Trie, Entry, E, true):-
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!, trie_get_entry(Entry, Proof),
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delete(Proof, E, NewProof),
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(NewProof == [] ->
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trie_delete(Trie),
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trie_put_entry(Trie, [true], _)
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;
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trie_remove_entry(Entry),
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trie_put_entry(Trie, NewProof, _)
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).
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trie_replace_entry(Trie, _Entry, t(ID), R):-
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trie_replace_nested_trie(Trie, ID, R).
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trie_delete(Trie):-
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trie_traverse(Trie, R),
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trie_remove_entry(R),
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fail.
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trie_delete(_Trie).
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is_state(Variable):-
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Variable == true, !.
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is_state(Variable):-
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Variable == false.
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is_state(Variable):-
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nonvar(Variable),
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Variable = not(NestedVariable),
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is_state(NestedVariable).
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is_trie(Trie, ID):-
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nonvar(Trie),
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Trie = t(ID), !.
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is_trie(Trie, ID):-
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nonvar(Trie),
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Trie = not(NestedTrie),
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is_trie(NestedTrie, ID).
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is_label(Label, ID):-
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atom(Label), !,
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atomic_concat('L', ID, Label).
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is_label(Label, ID):-
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nonvar(Label),
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Label = not(NestedLabel),
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is_label(NestedLabel, ID).
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% Ancestor related stuff
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initialise_ancestors(0):-
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problog_flag(anclst_represent, integer).
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initialise_ancestors([]):-
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problog_flag(anclst_represent, list).
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add_to_ancestors(ID, Ancestors, NewAncestors):-
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integer(Ancestors), !,
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NewAncestors is (1 << (ID - 1)) \/ Ancestors.
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add_to_ancestors(ID, Ancestors, NewAncestors):-
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is_list(Ancestors),
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list_to_ord_set([ID|Ancestors], NewAncestors).
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ancestor_subset_check(SubAncestors, Ancestors):-
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integer(SubAncestors), !,
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SubAncestors is Ancestors /\ SubAncestors.
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ancestor_subset_check(SubAncestors, Ancestors):-
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is_list(SubAncestors),
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ord_subset(SubAncestors, Ancestors).
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ancestor_loop_refine(Loop, Ancestors, 0):-
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var(Loop), integer(Ancestors), !.
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ancestor_loop_refine(Loop, Ancestors, []):-
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var(Loop), is_list(Ancestors), !.
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ancestor_loop_refine(true, Ancestors, Ancestors).
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% Cycle check related stuff
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% missing synonym check
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cycle_check(ID, Ancestors):-
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integer(Ancestors), !,
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Bit is 1 << (ID - 1),
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Bit is Bit /\ Ancestors.
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cycle_check(ID, Ancestors):-
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is_list(Ancestors),
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memberchk(ID, Ancestors).
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preprocess(Index, DepthBreadthTrie, OptimizationLevel, StartCount, FinalEndCount):-
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problog:problog_chktabled(Index, Trie), !,
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trie_dup(Trie, CopyTrie),
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initialise_ancestors(Ancestors),
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make_nested_trie_base_cases(CopyTrie, t(Index), DepthBreadthTrie, OptimizationLevel, StartCount, EndCount, Ancestors),
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trie_close(CopyTrie),
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Next is Index + 1,
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preprocess(Next, DepthBreadthTrie, OptimizationLevel, EndCount, FinalEndCount).
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preprocess(_, _, _, FinalEndCount, FinalEndCount).
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make_nested_trie_base_cases(Trie, t(ID), DepthBreadthTrie, OptimizationLevel, StartCount, FinalEndCount, Ancestors):-
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trie_to_depth_breadth_trie(Trie, DepthBreadthTrie, Label, OptimizationLevel, StartCount, EndCount),
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(is_trie(Label, SID) ->
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trie_get_depth_breadth_reduction_entry(NestedEntry),
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trie_replace_entry(Trie, NestedEntry, Label, false),
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add_to_ancestors(SID, Ancestors, NewAncestors),
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make_nested_trie_base_cases(Trie, t(ID), DepthBreadthTrie, OptimizationLevel, EndCount, FinalEndCount, NewAncestors)
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;
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FinalEndCount = EndCount,
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get_set_trie(ID, Label, Ancestors)
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).
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nested_trie_to_depth_breadth_trie(Trie, DepthBreadthTrie, FinalLabel, OptimizationLevel):-
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integer(OptimizationLevel),
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trie_open(DepthBreadthTrie),
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(problog_flag(trie_preprocess, true) ->
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preprocess(1, DepthBreadthTrie, OptimizationLevel, 0, StartCount)
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;
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StartCount = 0
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),
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initialise_ancestors(Ancestors),
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% initialise_ancestors(Childs),
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(problog_flag(loop_refine_ancs, true) ->
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trie_2_dbtrie_init(Trie, DepthBreadthTrie, OptimizationLevel, StartCount, _, Ancestors, FinalLabel, _)
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;
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trie_2_dbtrie_init(Trie, DepthBreadthTrie, OptimizationLevel, StartCount, _, Ancestors, FinalLabel, true)
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),
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eraseall(problog_trie_table).
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trie_2_dbtrie_init(ID, DepthBreadthTrie, OptimizationLevel, StartCount, EndCount, Ancestors, Label, ContainLoop):-
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get_trie_pointer(ID, Trie),
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trie_dup(Trie, CopyTrie),
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trie_2_dbtrie_intern(CopyTrie, DepthBreadthTrie, OptimizationLevel, StartCount, EndCount, Ancestors, Label, ContainLoop),
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trie_close(CopyTrie).
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trie_2_dbtrie_intern(Trie, DepthBreadthTrie, OptimizationLevel, StartCount, FinalEndCount, Ancestors, TrieLabel, ContainLoop):-
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trie_to_depth_breadth_trie(Trie, DepthBreadthTrie, Label, OptimizationLevel, StartCount, EndCount),
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(is_trie(Label, ID) -> % Label might have issues with negation
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trie_get_depth_breadth_reduction_entry(NestedEntry),
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% check if Trie introduces a loop
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(cycle_check(ID, Ancestors) ->
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ContainLoop = true,
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NewLabel = false,
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NewEndCount = EndCount
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;
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% check if Trie is resolved and extract it
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(get_set_trie(ID, NewLabel, Ancestors) ->
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NewEndCount = EndCount
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;
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% calculate the nested trie
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add_to_ancestors(ID, Ancestors, NewAncestors), % to be able to support 2 representations
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trie_2_dbtrie_init(ID, DepthBreadthTrie, OptimizationLevel, EndCount, NewEndCount, NewAncestors, NewLabel, NewContainLoop),
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ancestor_loop_refine(NewContainLoop, Ancestors, RefinedAncestors),
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get_set_trie(ID, NewLabel, RefinedAncestors),
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ContainLoop = NewContainLoop
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)
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),
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trie_replace_entry(Trie, NestedEntry, t(ID), NewLabel), % should be careful to verify that it works also with not(t(ID))
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trie_2_dbtrie_intern(Trie, DepthBreadthTrie, OptimizationLevel, NewEndCount, FinalEndCount, Ancestors, TrieLabel, ContainLoop)
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;
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% else we can terminate and return
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FinalEndCount = EndCount,
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TrieLabel = Label
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).
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% predicate to check/remember resolved tries
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% no refiment of ancestor list included
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get_trie_pointer(ID, Trie):-
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problog:problog_chktabled(ID, Trie), !.
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get_trie_pointer(Trie, Trie).
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get_set_trie(Trie, Label, Ancestors):-
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recorded(problog_trie_table, store(Trie, StoredAncestors, Label), _),
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(problog_flag(subset_check, true) ->
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ancestor_subset_check(StoredAncestors, Ancestors)
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;
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StoredAncestors == Ancestors
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), !.
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get_set_trie(Trie, Label, Ancestors):-
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ground(Label),
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recordz(problog_trie_table, store(Trie, Ancestors, Label), _).
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% chk_negated([H|T], ID):-
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% simplify(H, not(t(ID))), !.
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% chk_negated([_|T], ID):-
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% chk_negated(T, ID).
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/*
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chk_negated([], ID, ID).
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chk_negated([H|T], ID, not(ID)):-
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simplify(H, not(t(ID))), !.
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chk_negated([H|T], ID, ID):-
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simplify(H, t(ID)), !.
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chk_negated([_|T], ID, FID):-
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chk_negated(T, ID, FID).*/
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