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yap-6.3/packages/ProbLog/problog/hash_table.yap
Vítor Santos Costa ed0d3f6cae Latest ProbLog
2012-01-11 14:44:59 +00:00

748 lines
27 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
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Artistic License 2.0
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Module hash_table.
%
% Maps tuples of form (x1,x2,...,xn) to incremental IDs.
% Ensures lookup time for tuple = O(n) with n being the size of tuple lookup
% time is independed from the amount of entries in the table when +Size big.
% If +Size not big enought then lookup time linear per +Size entries.
% To return from ID to tuple again constant time but based on +TuppleSize.
%
% Exports:
%
% hash_table_init(+Size, -HashTable)
% hash_table_init(+Size, +TupleSize, -HashTable)
%
% Initializes a hash table with internal array size of +Size, and #tuples
% of +TupleSize.
% +Size ~> # of problog different prob facts.
% +TupleSize ~> estimated tuples to be used.
%
% hash_table_set_domain_size(+HashTable, +Tuple, +TupleSize)
%
% Useful to define that a specific +Tuple mask will have specific internal
% size. It also pre initialized an array for the ID.
% Examples: if problog fact ID1 is a non-ground and we now that it has
% 1000 possible groundings then: hash_table_set_domain_size(HT, ID1, 1000).
% problog fact ID2 is an mvs with 5 possible values and each is non
% ground with 100 possible values then: hash_table_set_domain_size(HT, ID2, 5),
% hash_table_set_domain_size(HT, (ID2,'*'), 100).
% When emmitted the internal array will assume the defined size from father.
%
% hash_table_delete(+HashTable)
%
% Clears the +HashTable
%
% hash_table_display(+HashTable, +ColSize, +PaneSize)
%
% Debug only purposes currently.
%
% hash_table_lookup(+HashTable, +Tuple, -ID)
% hash_table_lookup(+HashTable, -Tuple, +ID)
%
% This is the lookup function. Either takes a +Tuple and retuns an -ID
% or vice versa. Handles collisions, automatically grows array by a chain
% of arrays.
%
% hash_table_contains(+HashTable, +Tuple, -ID)
%
% Similar with lookup but only checks if +Tuple has been seen and returns -ID.
%
% hash_table_get_entries(+HashTable, -Count)
%
% Returns the # of tuples seen up to now.
%
% problog_key_to_tuple(+Key, -Tuple)
%
% Takes a +Key of format "ID1_ID2" and makes a tuple (ID1, ID2)
%
%
% IMPORTANT: Currently it under performs for some reason...
%
:- module(hash_table, [hash_table_init/2,
hash_table_init/3,
hash_table_set_domain_size/3,
hash_table_delete/1,
hash_table_reset/1,
hash_table_lookup/3,
hash_table_contains/3,
hash_table_get_entries/2,
hash_table_display/3,
problog_key_to_tuple/2]).
:- use_module(library(lists), [member/2]).
%
% General use predicates
%
int(N):-
int(0, N).
int(N, N).
int(P, R):-
N is P + 1,
int(N, R).
get_digits(Num, Digits):-
get_digits(Num, Digits, 1).
get_digits(Num, Digits, Digits):-
Num < 10, !.
get_digits(Num, Digits, Acc):-
NNum is Num / 10,
NAcc is Acc + 1,
get_digits(NNum, Digits, NAcc).
%
% Simple Counters
%
:- initialization(bb_put(array_count, 1)).
get_next_array(ID, Name):-
bb_get(array_count, ID),
NewID is ID + 1,
bb_put(array_count, NewID),
number_atom(ID, Name).
get_next_identifier(Identifier, Next):-
bb_get(Identifier, Next),
NewNext is Next + 1,
bb_put(Identifier, NewNext).
%
% Syntactic Sugar
%
get_array_name(ID, Array):- % if you change this, you need to change also get_next_array
% char_code(Array, ID).
number_atom(ID, Array).
% atomic_concat(array, ID, Array).
get_array_identifier(ID, Identifier):-
atomic_concat(array_identifier, ID, Identifier).
%
% hash_table_init(+Size, -HashTable)
% initializes a HashTable with Size positions, collitions are handled
% by expanding a new array that is kept at the last array element
%
hash_table_init(Size, HashTable):-
hash_table_init(Size, Size, HashTable).
hash_table_init(Size, RevSize, HashTable):-
ArraySize is Size + 1,
get_next_array(ID, Array),
get_array_identifier(ID, Identifier),
static_array(Array, ArraySize, int),
bb_put(Identifier, 1),
RevArraySize is RevSize + 1,
get_next_array(_RevID, RevArray),
static_array(RevArray, RevArraySize, term),
recordz(hash_table, hash(Array, Size, Identifier, RevArray, RevSize), HashTable).
hash_table_expand_array(Array, Size, NewArray):-
ArraySize is Size + 1,
get_next_array(ID, NewArray),
static_array(NewArray, ArraySize, int),
update_array(Array, Size, ID).
hash_table_sub_array_init(Array, Index, NewArray, Size):-
ArraySize is Size + 1,
get_next_array(ID, NewArray),
static_array(NewArray, ArraySize, int),
recordz(hash_table_arrays, array(ID, NewArray, Size, Array), _),
update_array(Array, Index, ID).
%
% hash_table_set_domain_size(HashTable, Index, DomainSize)
%
hash_table_set_domain_size(HashTable, Index, DomainSize):-
ground(Index),
ground(HashTable),
recorded(hash_table, hash(Array, Size, _Identifier, _RevArray, _RevSize), HashTable),
hash_table_set_domain_size(Array, Size, Index, DomainSize).
hash_table_set_domain_size(Array, Size, Index, DomainSize):-
integer(Index),
Index < Size, !,
array_element(Array, Index, A),
(A is 0 ->
hash_table_sub_array_init(Array, Index, _NewArray, DomainSize)
;
throw(hash_table_exception(set_domain_size_fail(duplicate_definition(Index, DomainSize))))
).
hash_table_set_domain_size(Array, Size, Index, DomainSize):-
integer(Index), !,
NewIndex is Index - Size,
array_element(Array, Size, SubArrayID),
(SubArrayID is 0->
hash_table_expand_array(Array, Size, NewArray)
;
get_array_name(SubArrayID, NewArray)
),
hash_table_set_domain_size(NewArray, Size, NewIndex, DomainSize).
hash_table_set_domain_size(Array, Size, Index, DomainSize):-
Index == '*', !,
int(N),
hash_table_set_domain_size(Array, Size, N, DomainSize),
N is Size - 1, !.
hash_table_set_domain_size(Array, Size, (Index, Rest), DomainSize):-
integer(Index),
Index < Size, !,
array_element(Array, Index, SubArrayID),
(SubArrayID is 0->
throw(hash_table_exception(set_domain_size_fail(sub_array_missing((Index, Rest), DomainSize))))
;
recorded(hash_table_arrays, array(SubArrayID, SubArray, SubArraySize, Array), _)
),
hash_table_set_domain_size(SubArray, SubArraySize, Rest, DomainSize).
hash_table_set_domain_size(Array, Size, (Index, Rest), DomainSize):-
integer(Index),
NewIndex is Index - Size,
array_element(Array, Size, SubArrayID),
(SubArrayID is 0->
hash_table_expand_array(Array, Size, NewArray)
;
get_array_name(SubArrayID, NewArray)
),
hash_table_set_domain_size(NewArray, Size, (NewIndex, Rest), DomainSize).
%
% hash_table_delete(+HashTable)
% deletes the arrays, records, and blackboard variables related with the hashtable
%
hash_table_delete(HashTable):-
ground(HashTable),
recorded(hash_table, hash(Array, Size, Identifier, RevArray, RevSize), HashTable),
bb_delete(Identifier, _),
erase(HashTable),
hash_table_delete_array(Array, Size),
hash_table_delete_rev_array(RevArray, RevSize).
hash_table_delete_array(Array, Size):-
hash_table_delete_chain(Array, Size),
hash_table_delete_subarrays(Array),
close_static_array(Array).
hash_table_delete_chain(Array, Size):-
array_element(Array, Size, ChainArrayID),
(ChainArrayID is 0 ->
true
;
get_array_name(ChainArrayID, ChainArray),
hash_table_delete_array(ChainArray, Size)
).
hash_table_delete_subarrays(Array):- % I can improve the performance of this by making a second record with Array infront
forall(recorded(hash_table_arrays, array(_SubArrayID, SubArray, Size, Array) , Ref),
(erase(Ref), hash_table_delete_array(SubArray, Size))).
hash_table_delete_rev_array(Array, Size):-
(array_element(Array, Size, ChainArray) ->
hash_table_delete_rev_array(ChainArray, Size)
;
true
),
close_static_array(Array).
%
% hash_table_reset(+HashTable)
%
% resets the table values, retains the structure
%
hash_table_reset(HashTable):-
ground(HashTable),
recorded(hash_table, hash(Array, Size, Identifier, RevArray, RevSize), HashTable),
hash_table_get_entries(HashTable, Count),
int(Index),
hash_table_lookup(HashTable, Tuple, Index),
hash_table_reset_element(Array, Size, Tuple),
Index is Count - 1, !,
hash_table_reset_rev_array(RevArray, RevSize),
bb_put(Identifier, 1).
hash_table_reset_element(Array, Size, Index):-
integer(Index),
Index < Size, !,
update_array(Array, Index, 0).
hash_table_reset_element(Array, Size, Index):-
integer(Index),
NewIndex is Index - Size,
array_element(Array, Size, SubArrayID),
get_array_name(SubArrayID, SubArray),
hash_table_reset_element(SubArray, Size, NewIndex).
hash_table_reset_element(Array, Size, (Index, Rest)):-
integer(Index),
Index < Size, !,
array_element(Array, Index, SubArrayID),
recorded(hash_table_arrays, array(SubArrayID, SubArray, SubArraySize, Array), _),
hash_table_reset_element(SubArray, SubArraySize, Rest).
hash_table_reset_element(Array, Size, (Index, Rest)):-
integer(Index),
NewIndex is Index - Size,
array_element(Array, Size, SubArrayID),
get_array_name(SubArrayID, SubArray),
hash_table_reset_element(SubArray, Size, (NewIndex, Rest)).
hash_table_reset_rev_array(RevArray, RevSize):-
array_element(RevArray, RevSize, ChainArray), !,
reset_static_array(RevArray),
update_array(RevArray, RevSize, ChainArray),
hash_table_reset_rev_array(ChainArray, RevSize).
hash_table_reset_rev_array(RevArray, _RevSize):-
reset_static_array(RevArray).
%
% hash_table_lookup(+HashTable, +Tuple, -ID)
% hash_table_lookup(+HashTable, -Tuple, +ID)
% lookup Tuple in HashTable and insert, return ID
% lookup ID in HashTable and return Tuple
%
% Known bug: If HashTable contains a Tuple of form (ID, _) looking up ID succeeds
% and returns the SubArrayID.
% This is safe under the assumption that ID is unique to start from.
%
hash_table_lookup(HashTable, Tuple, ID):-
ground(Tuple),
ground(HashTable), !,
recorded(hash_table, hash(Array, Size, Identifier, RevArray, RevSize), HashTable),
hash_table_lookup(Array, Size, Identifier, Tuple, ID),
hash_table_update_rev_array(RevArray, RevSize, ID, Tuple).
hash_table_lookup(HashTable, Tuple, ID):-
integer(ID),
ground(HashTable),
recorded(hash_table, hash(_Array, _Size, _Identifier, RevArray, RevSize), HashTable),
hash_table_element_rev_array(RevArray, RevSize, ID, Tuple).
hash_table_lookup(Array, Size, Identifier, Index, RID):-
integer(Index),
Index < Size, !,
array_element(Array, Index, StoredID),
(StoredID is 0 ->
get_next_identifier(Identifier, ID),
update_array(Array, Index, ID)
;
ID = StoredID
),
RID is ID - 1.
hash_table_lookup(Array, Size, Identifier, Index, ID):-
integer(Index), !,
NewIndex is Index - Size,
array_element(Array, Size, ArrayID),
(ArrayID is 0 ->
hash_table_expand_array(Array, Size, SubArray)
;
get_array_name(ArrayID, SubArray)
),
hash_table_lookup(SubArray, Size, Identifier, NewIndex, ID).
hash_table_lookup(Array, Size, Identifier, (Index,Tuple), ID):-
integer(Index),
Index < Size, !,
array_element(Array, Index, ArrayID),
(ArrayID is 0 ->
NewSize = Size,
hash_table_sub_array_init(Array, Index, SubArray, Size)
;
recorded(hash_table_arrays, array(ArrayID, SubArray, NewSize, Array), _)
),
hash_table_lookup(SubArray, NewSize, Identifier, Tuple, ID).
hash_table_lookup(Array, Size, Identifier, (Index,Tuple), ID):-
integer(Index),
NewIndex is Index - Size,
array_element(Array, Size, ArrayID),
(ArrayID is 0 ->
hash_table_expand_array(Array, Size, SubArray)
;
get_array_name(ArrayID, SubArray)
),
hash_table_lookup(SubArray, Size, Identifier, (NewIndex, Tuple), ID).
hash_table_update_rev_array(Array, Size, Index, Tuple):-
integer(Index),
Index < Size, !,
update_array(Array, Index, Tuple).
hash_table_update_rev_array(Array, Size, Index, Tuple):-
integer(Index),
NewIndex is Index - Size,
(array_element(Array, Size, SubArray) ->
true
;
SubArraySize is Size + 1,
get_next_array(_SubArrayID, SubArray),
static_array(SubArray, SubArraySize, term),
update_array(Array, Size, SubArray)
),
hash_table_update_rev_array(SubArray, Size, NewIndex, Tuple).
hash_table_element_rev_array(Array, Size, Index, Tuple):-
integer(Index),
Index < Size, !,
array_element(Array, Index, Tuple).
hash_table_element_rev_array(Array, Size, Index, Tuple):-
integer(Index),
NewIndex is Index - Size,
array_element(Array, Size, SubArray),
hash_table_element_rev_array(SubArray, Size, NewIndex, Tuple).
%
% hash_table_contains(+HashTable, +Tuple, -ID)
% search the hash_table to see if it contains a Tuple and return the ID
%
% Known bug: If HashTable contains a Tuple of form (ID, _) asking if HashTable
% contains ID it succeeds.
% This is safe under the assumption that ID is unique to start from.
%
hash_table_contains(HashTable, Tuple, ID):-
ground(Tuple),
ground(HashTable), !,
recorded(hash_table, hash(Array, Size, _Identifier, _RevArray, _RevSize), HashTable),
hash_table_contains(Array, Size, Tuple, ID).
hash_table_contains(Array, Size, Index, RID):-
integer(Index),
Index < Size, !,
array_element(Array, Index, ID),
ID > 0,
RID is ID - 1.
hash_table_contains(Array, Size, Index, ID):-
integer(Index), !,
NewIndex is Index - Size,
array_element(Array, Size, SubArrayID),
SubArrayID > 0,
get_array_name(SubArrayID, SubArray),
hash_table_contains(SubArray, Size, NewIndex, ID).
hash_table_contains(Array, Size, (Index,Tuple), ID):-
integer(Index),
Index < Size, !,
array_element(Array, Index, SubArrayID),
SubArrayID > 0,
recorded(hash_table_arrays, array(SubArrayID, SubArray, NewSize, Array), _),
hash_table_contains(SubArray, NewSize, Tuple, ID).
hash_table_contains(Array, Size, (Index,Tuple), ID):-
integer(Index),
NewIndex is Index - Size,
array_element(Array, Size, SubArrayID),
SubArrayID > 0,
get_array_name(SubArrayID, SubArray),
hash_table_contains(SubArray, Size, (NewIndex, Tuple), ID).
%
% hash_table_get_entries(+HashTable, -Count)
%
% returns the number of entries inside the hash table
%
hash_table_get_entries(HashTable, Count):-
ground(HashTable),
recorded(hash_table, hash(_Array, _Size, Identifier, _RevArray, _RevSize), HashTable),
bb_get(Identifier, Num),
Count is Num - 1.
%
% hash_table_display(+HashTable, +ColSize, +PaneSize)
%
% Only for debugging reasons.
%
hash_table_display(HashTable, ColSize, PaneSize):-
ground(HashTable), integer(ColSize), integer(PaneSize), ColSize =< PaneSize,
recorded(hash_table, hash(Array, Size, Identifier, RevArray, RevSize), HashTable),
hash_table_get_entries(HashTable, Count),
format('Hash Table: ~q~n Entries: ~d~n Identifier: ~w~n', [HashTable, Count, Identifier]),
hash_table_display_array(Array, Size),
hash_table_display_rev_array(RevArray, RevSize, Identifier, ColSize, PaneSize).
hash_table_display_array(Array, Size):-
hash_table_get_chains(Array, Size, Chains),
findall(SubArray, recorded(hash_table_arrays, array(_, SubArray, _, Array),_), SubArrays),
format('Array: ~q~n Size: ~d~n Chains: ~q~n Sub Arrays: ~q~n',[Array, Size, Chains, SubArrays]),
forall(member(SubArray, SubArrays), (
recorded(hash_table_arrays, array(_, SubArray, SubSize, Array),_),
hash_table_display_array(SubArray, SubSize)
)).
hash_table_display_rev_array(RevArray, RevSize, Identifier, ColSize, PaneSize):-
hash_table_get_chains(RevArray, RevSize, Chains),
format('Array: ~q~n Size: ~d~n Chains: ~q~n', [RevArray, RevSize, Chains]),
bb_get(Identifier, Num),
get_digits(Num, Digits),
hash_table_get_elements(RevArray, RevSize, 0, Tupples),
hash_table_display_elements(0, Tupples, Digits, ColSize, PaneSize).
hash_table_get_elements(RevArray, RevSize, Current, [Tupple|Tupples]):-
Current < RevSize,
array_element(RevArray, Current, Tupple), !,
Next is Current + 1,
hash_table_get_elements(RevArray, RevSize, Next, Tupples).
hash_table_get_elements(_RevArray, RevSize, Current, []):-
Current < RevSize, !.
hash_table_get_elements(RevArray, RevSize, RevSize, Tupples):-
array_element(RevArray, RevSize, NextArray), !,
hash_table_get_elements(NextArray, RevSize, 0, Tupples).
hash_table_get_elements(_RevArray, RevSize, RevSize, []).
hash_table_get_chains(Array, Size, Chains):-
((array_element(Array, Size, ChainID), ChainID \== 0) ->
(integer(ChainID) ->
get_array_name(ChainID, ChainName)
;
ChainName = ChainID
),
hash_table_get_chains(ChainName, Size, RestChains),
Chains = [ChainName|RestChains]
;
Chains = []
).
hash_table_display_elements(_Index, [], _Digits, _ColSize, _PaneSize):- format('~n',[]), !.
hash_table_display_elements(Index, [Element|T], Digits, ColSize, PaneSize):-
NL is Index mod integer(PaneSize / ColSize),
RealColSize is ColSize - Digits - 3,
((NL > 0; Index =:= 0) -> true; format('~n',[])),
format('~t~d~*+ = ~q~*+', [Index, Digits, Element, RealColSize]),
NewIndex is Index + 1,
hash_table_display_elements(NewIndex, T, Digits, ColSize, PaneSize).
%
% problog_key_to_tuple(+Key, -Tuple)
%
% This should be removed in new implementation
%
problog_key_to_tuple(Key, Key):-
integer(Key), !.
problog_key_to_tuple(Key, (PID, SID)):-
atomic(Key),
atom_chars(Key, ID_Chars),
break_list_at(ID_Chars, 95, Part1, Part2),
% once(append(Part1, [95|Part2], ID_Chars)), % 95 = '_'
number_chars(PID, Part1),
number_chars(SID, Part2).
break_list_at([H|T], H, [], T):-!.
break_list_at([H|T], At, [H|Part1], Part2):-
break_list_at(T, At, Part1, Part2).