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2010-08-26 13:40:50 +01:00
%%% -*- Mode: Prolog; -*-
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
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% $Date: 2010-12-02 15:20:15 +0100 (Thu, 02 Dec 2010) $
% $Revision: 5043 $
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%
% 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, Dimitar Sht. Shterionov
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Artistic License 2.0
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- module(mc_DNF_sampling, [problog_dnf_sampling/3]).
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:- use_module(library(lists), [memberchk/2]).
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:- use_module(variables).
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:- use_module(sampling, _, [problog_random/1,
problog_convergence_check/6]).
:- use_module(flags, _, [problog_define_flag/5,
problog_flag/2]).
:- use_module(os, _, [convert_filename_to_working_path/2]).
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:- use_module(hash_table).
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:- initialization((
problog_define_flag(search_method, problog_flag_validate_in_list([linear, binary]), 'search method for picking proof', binary, monte_carlo_sampling_dnf),
problog_define_flag(represent_world, problog_flag_validate_in_list([list, record, array, hash_table]), 'structure that represents sampled world', array, monte_carlo_sampling_dnf),
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problog_var_define(dnf_sampling_time, times, time, messages('DNF Sampling', ':', ' ms')),
problog_var_define(probability_lower, result, untyped, messages('Lower probability bound', ' = ', '')),
problog_var_define(probability_upper, result, untyped, messages('Upper probability bound', ' = ', ''))
)).
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% problog_independed(T, P):-
% tries:trie_traverse_first(T, FirstRef), !,
% problog_independed(FirstRef, P, 0.0, _, 0).
% problog_independed(_T, 0.0).
problog_independed(T, P, ProofCNT):-
tries:trie_traverse_first(T, FirstRef), !,
problog_independed(FirstRef, P, 0.0, ProofCNT, 0).
problog_independed(_T, 0.0, 0).
%%% this should be generalized to handle nested tries
problog_independed([], P, P, ProofCNT, ProofCNT).
problog_independed(ProofRef, P, A, ProofCNT, Index):-
tries:trie_get_entry(ProofRef, Proof),
calculate_prob_proof(Proof, Pproof),
calculate_prob_proof(Proof, Pproof),
NA is A + Pproof,
NIndex is Index + 1,
recordz(problog_mc_dnf, proof(Index, ProofRef, Pproof, NA), _),
(tries:trie_traverse_next(ProofRef, NxtProofRef) ->
NextProofRef = NxtProofRef
;
NextProofRef = []
),
problog_independed(NextProofRef, P, NA, ProofCNT, NIndex).
%%% this should be generalized to handle nested tries
calculate_prob_proof([true], 1.0):-!.
calculate_prob_proof(Proof, P):-
calculate_curr_prob(Proof, 0.0, L),
P is exp(L).
calculate_curr_prob([], Acc, Acc).
calculate_curr_prob([ID|Rest], AccCurrProb, CurrProb):-
get_log_prob_not_check(ID, IDProb),
AccCurrProb1 is AccCurrProb + IDProb,
calculate_curr_prob(Rest, AccCurrProb1, CurrProb).
%%%% this should be generalized and go to problog_fact module
get_log_prob_not_check(not(ID), IDProb):-
!, problog:get_fact_probability(ID, Prob1),
Prob2 is 1 - Prob1, IDProb is log(Prob2).
get_log_prob_not_check(ID, IDProb):-
problog:get_fact_log_probability(ID, IDProb).
problog_mc_DNF(Trie, Delta, P):-
problog_flag(mc_batchsize, Samples),
problog_independed(Trie, Pind, ProofCNT),
(ProofCNT > 1 ->
problog_mc_DNF(Trie, Pind, ProofCNT, Delta, Samples, 0, SamplesSoFar, Naccepted, 0, _Epsilon),
P is Naccepted / SamplesSoFar * Pind
;
P is Pind,
problog_var_set(probability, P)
),
eraseall(problog_mc_dnf).
problog_mc_DNF(_Trie, Pind, _ProofCNT, Delta, Samples, SamplesSoFar, SamplesSoFar, Naccepted, Naccepted, Epsilon):-
SamplesSoFar > 0,
SamplesSoFar mod Samples =:= 0,
P is Naccepted / SamplesSoFar * Pind,
problog_timer_pause(dnf_sampling_time, T),
problog_timer_resume(dnf_sampling_time),
problog_convergence_check(T, P, SamplesSoFar, Delta, Epsilon, Converge),
(Converge = true; Converge = terminate), !,
problog_var_set(samples, SamplesSoFar),
problog_var_set(probability, P),
Pl is P - Epsilon,
Ph is P + Epsilon,
problog_var_set(probability_lower, Pl),
problog_var_set(probability_upper, Ph).
/*
problog_mc_DNF(_Trie, _Pind, _ProofCNT, _Delta, Samples, SamplesSoFar, _SamplesSoFar, _Naccepted, _Naccepted, _Epsilon):-
SamplesSoFar mod Samples =:= 0,
fail.*/
problog_mc_DNF(Trie, Pind, ProofCNT, Delta, Samples, SAcc, SamplesSoFar, Naccepted, NAcc, Epsilon):-
NSAcc is SAcc + 1,
problog_random(RND),
Thr is RND * Pind,
tries:trie_traverse_mode(backward),
(problog_flag(search_method, binary) ->
get_sample_proof_binary(CurRef, Thr, ProofCNT, L_true_pf, L_false_pf)
;
get_sample_proof_linear(CurRef, Thr, L_true_pf, L_false_pf)
),
(tries:trie_traverse_next(CurRef, NxtRef) ->
NextRef = NxtRef
;
NextRef = []
),
(check_sample_proofs(NextRef, L_true_pf, L_false_pf) ->
NNAcc is NAcc + 1
;
NNAcc is NAcc
),
(problog_flag(represent_world, record) ->
eraseall(problog_sample_world)
;
(problog_flag(represent_world, array) ->
close_static_array(problog_sample_world)
;
(problog_flag(represent_world, hash_table) ->
hash_table_delete(L_true_pf),
hash_table_delete(L_false_pf)
;
true
)
)
),
tries:trie_traverse_mode(forward),
problog_mc_DNF(Trie, Pind, ProofCNT, Delta, Samples, NSAcc, SamplesSoFar, Naccepted, NNAcc, Epsilon).
get_sample_proof_linear(Ref, Thr, L_true_pf, L_false_pf):-
recorded(problog_mc_dnf, proof(_Index, Ref, _Pproof, Ps), _),
Thr < Ps,
tries:trie_get_entry(Ref, Proof),
(problog_flag(represent_world, hash_table) ->
make_hash_tables(L_true_pf, L_false_pf),
add_proof_to_hash_world(Proof, L_true_pf, L_false_pf)
;
(problog_flag(represent_world, record) ->
add_proof_to_rec_world(Proof)
;
(problog_flag(represent_world, array) ->
nb_getval(probclause_counter, ProbFactCNT),
Size is ProbFactCNT + 1,
static_array(problog_sample_world, Size, int),
add_proof_to_array_world(Proof)
;
add_proof_to_list_world(Proof, L_true_pf, L_false_pf)
)
)
).
get_sample_proof_binary(Ref, Thr, ProofCNT, L_true_pf, L_false_pf):-
Last is ProofCNT - 1,
binary_search(Thr, 0, Last, Ref), !,
tries:trie_get_entry(Ref, Proof),
(problog_flag(represent_world, hash_table) ->
make_hash_tables(L_true_pf, L_false_pf),
add_proof_to_hash_world(Proof, L_true_pf, L_false_pf)
;
(problog_flag(represent_world, record) ->
add_proof_to_rec_world(Proof)
;
(problog_flag(represent_world, array) ->
nb_getval(probclause_counter, ProbFactCNT),
Size is ProbFactCNT + 1,
static_array(problog_sample_world, Size, int),
add_proof_to_array_world(Proof)
;
add_proof_to_list_world(Proof, L_true_pf, L_false_pf)
)
)
).
binary_search(Thr, From, To, Ref):-
1 is To - From, !,
recorded(problog_mc_dnf, proof(From, RefF, _Pproof, PsF), _),
(Thr > PsF ->
recorded(problog_mc_dnf, proof(To, Ref, _PproofTo, _Ps), _)
;
Ref = RefF
).
binary_search(_Thr, Index, Index, Ref):-
!, recorded(problog_mc_dnf, proof(Index, Ref, _Pproof, _Ps), _).
binary_search(Thr, From, To, Res):-
Look is From + integer((To - From + 1) / 2),
recorded(problog_mc_dnf, proof(Look, _Ref, _Pproof, Ps), _), !,
(Thr > Ps ->
NewFrom is Look + 1,
NewTo is To
;
NewFrom is From,
NewTo is Look
),
binary_search(Thr, NewFrom, NewTo, Res).
%%%%%%%%% This code can be improved and generalized %%%%%%%%%
check_sample_proofs([], _, _).
check_sample_proofs(CurRef, L_true_pf, L_false_pf):-
!, tries:trie_get_entry(CurRef, Proof),
(problog_flag(represent_world, hash_table) ->
check_proof_in_hash_world(Proof, L_true_pf, L_false_pf),
NL_true_pf = L_true_pf,
NL_false_pf = L_false_pf
;
(problog_flag(represent_world, record) ->
check_proof_in_rec_world(Proof),
NL_true_pf = L_true_pf,
NL_false_pf = L_false_pf
;
(problog_flag(represent_world, array) ->
check_proof_in_array_world(Proof),
NL_true_pf = L_true_pf,
NL_false_pf = L_false_pf
;
check_proof_in_list_world(Proof, L_true_pf, NL_true_pf, L_false_pf, NL_false_pf)
)
)
),
(tries:trie_traverse_next(CurRef, NxtRef) ->
NextRef = NxtRef
;
NextRef = []
),
check_sample_proofs(NextRef, NL_true_pf, NL_false_pf).
add_proof_to_array_world([]).
add_proof_to_array_world([not(H)|T]):-
!, update_array(problog_sample_world, H, -1), add_proof_to_array_world(T).
add_proof_to_array_world([H|T]):-
update_array(problog_sample_world, H, 1), add_proof_to_array_world(T).
check_proof_in_array_world([not(F)|_Rest]):-
array_element(problog_sample_world, F, 1), !.
check_proof_in_array_world([not(F)|Rest]):-
array_element(problog_sample_world, F, -1), !,
check_proof_in_array_world(Rest).
check_proof_in_array_world([not(F)|Rest]):-
!, problog_random(RND), Dice is RND,
problog:get_fact_probability(F, NumProbF),
(Dice =< NumProbF ->
update_array(problog_sample_world, F, 1)
;
update_array(problog_sample_world, F, -1),
check_proof_in_array_world(Rest)
).
check_proof_in_array_world([F|_Rest]):-
array_element(problog_sample_world, F, -1), !.
check_proof_in_array_world([F|Rest]):-
array_element(problog_sample_world, F, 1), !,
check_proof_in_array_world(Rest).
check_proof_in_array_world([F|Rest]):-
!, problog_random(RND), Dice is RND,
problog:get_fact_probability(F, NumProbF),
(Dice > NumProbF ->
update_array(problog_sample_world, F, -1)
;
update_array(problog_sample_world, F, 1),
check_proof_in_array_world(Rest)
).
add_proof_to_rec_world([]).
add_proof_to_rec_world([not(H)|T]):-
!, recordz(problog_sample_world, false_fact(H), _), add_proof_to_rec_world(T).
add_proof_to_rec_world([H|T]):-
recordz(problog_sample_world, true_fact(H), _), add_proof_to_rec_world(T).
check_proof_in_rec_world([not(F)|_Rest]):-
recorded(problog_sample_world, true_fact(F), _), !.
check_proof_in_rec_world([not(F)|Rest]):-
recorded(problog_sample_world, false_fact(F), _), !,
check_proof_in_rec_world(Rest).
check_proof_in_rec_world([not(F)|Rest]):-
!, problog_random(RND), Dice is RND,
problog:get_fact_probability(F, NumProbF),
(Dice =< NumProbF ->
recordz(problog_sample_world, true_fact(F), _)
;
recordz(problog_sample_world, false_fact(F), _),
check_proof_in_rec_world(Rest)
).
check_proof_in_rec_world([F|_Rest]):-
recorded(problog_sample_world, false_fact(F), _), !.
check_proof_in_rec_world([F|Rest]):-
recorded(problog_sample_world, true_fact(F), _), !,
check_proof_in_rec_world(Rest).
check_proof_in_rec_world([F|Rest]):-
!, problog_random(RND), Dice is RND,
problog:get_fact_probability(F, NumProbF),
(Dice > NumProbF ->
recordz(problog_sample_world, false_fact(F), _)
;
recordz(problog_sample_world, true_fact(F), _),
check_proof_in_rec_world(Rest)
).
make_hash_tables(TrueHashTable, FalseHashTable):-
nb_getval(probclause_counter, ProbFactCNT),
hash_table_init(ProbFactCNT, TrueHashTable),
hash_table_init(ProbFactCNT, FalseHashTable).
add_proof_to_hash_world([], _TrueHashTable, _FalseHashTable).
add_proof_to_hash_world([not(H)|T], TrueHashTable, FalseHashTable):-
!, problog_key_to_tuple(H, Tuple),
hash_table_lookup(FalseHashTable, Tuple, _),
add_proof_to_hash_world(T, TrueHashTable, FalseHashTable).
add_proof_to_hash_world([H|T], TrueHashTable, FalseHashTable):-
problog_key_to_tuple(H, Tuple),
hash_table_lookup(TrueHashTable, Tuple, _),
add_proof_to_hash_world(T, TrueHashTable, FalseHashTable).
check_proof_in_hash_world([not(F)|_Rest], TrueHashTable, _FalseHashTable):-
problog_key_to_tuple(F, Tuple),
hash_table_contains(TrueHashTable, Tuple, _), !.
check_proof_in_hash_world([not(F)|Rest], TrueHashTable, FalseHashTable):-
problog_key_to_tuple(F, Tuple),
hash_table_contains(FalseHashTable, Tuple, _), !,
check_proof_in_hash_world(Rest, TrueHashTable, FalseHashTable).
check_proof_in_hash_world([not(F)|Rest], TrueHashTable, FalseHashTable):-
!, problog_random(RND), Dice is RND,
problog:get_fact_probability(F, NumProbF),
problog_key_to_tuple(F, Tuple),
(Dice =< NumProbF ->
hash_table_lookup(TrueHashTable, Tuple, _)
;
hash_table_lookup(FalseHashTable, Tuple, _),
check_proof_in_hash_world(Rest, TrueHashTable, FalseHashTable)
).
check_proof_in_hash_world([F|_Rest], _TrueHashTable, FalseHashTable):-
problog_key_to_tuple(F, Tuple),
hash_table_contains(FalseHashTable, Tuple, _), !.
check_proof_in_hash_world([F|Rest], TrueHashTable, FalseHashTable):-
problog_key_to_tuple(F, Tuple),
hash_table_contains(TrueHashTable, Tuple, _), !,
check_proof_in_hash_world(Rest, TrueHashTable, FalseHashTable).
check_proof_in_hash_world([F|Rest], TrueHashTable, FalseHashTable):-
!, problog_random(RND), Dice is RND,
problog:get_fact_probability(F, NumProbF),
problog_key_to_tuple(F, Tuple),
(Dice > NumProbF ->
hash_table_lookup(FalseHashTable, Tuple, _)
;
hash_table_lookup(TrueHashTable, Tuple, _),
check_proof_in_hash_world(Rest, TrueHashTable, FalseHashTable)
).
add_proof_to_list_world([], [], []).
add_proof_to_list_world([not(H)|T], TrueList, [H|FalseList]):-
add_proof_to_list_world(T, TrueList, FalseList).
add_proof_to_list_world([H|T], [H|TrueList], FalseList):-
add_proof_to_list_world(T, TrueList, FalseList).
check_proof_in_list_world([not(F)|_Rest], TrueList, TrueList, FalseList, FalseList):-
memberchk(F, TrueList), !.
check_proof_in_list_world([not(F)|Rest], TrueList, NewTrueList, FalseList, NewFalseList):-
memberchk(F, FalseList), !,
check_proof_in_list_world(Rest, TrueList, NewTrueList, FalseList, NewFalseList).
check_proof_in_list_world([not(F)|Rest], TrueList, NewTrueList, FalseList, NewFalseList):-
!, problog_random(RND), Dice is RND,
problog:get_fact_probability(F, NumProbF),
(Dice =< NumProbF ->
NewTrueList = [F|TrueList],
NewFalseList = FalseList
;
check_proof_in_list_world(Rest, TrueList, NewTrueList, [F|FalseList], NewFalseList)
).
check_proof_in_list_world([F|_Rest], TrueList, TrueList, FalseList, FalseList):-
memberchk(F, FalseList), !.
check_proof_in_list_world([F|Rest], TrueList, NewTrueList, FalseList, NewFalseList):-
memberchk(F, TrueList), !,
check_proof_in_list_world(Rest, TrueList, NewTrueList, FalseList, NewFalseList).
check_proof_in_list_world([F|Rest], TrueList, NewTrueList, FalseList, NewFalseList):-
!, problog_random(RND), Dice is RND,
problog:get_fact_probability(F, NumProbF),
(Dice > NumProbF ->
NewTrueList = TrueList,
NewFalseList = [F|FalseList]
;
check_proof_in_list_world(Rest, [F|TrueList], NewTrueList, FalseList, NewFalseList)
).
problog_collect_trie(Goal, Threshold) :-
problog:init_problog_low(Threshold),
problog:problog_control(off, up),
problog:problog_control(on, exact),
problog_var_timer_start(sld_time),
problog:problog_call(Goal),
problog:add_solution,
fail.
problog_collect_trie(_, _) :-
problog:problog_control(off, exact),
problog_var_timer_stop(sld_time).
problog_dnf_sampling(Goal, Delta, P):-
% this should be generalized with general log file
problog_flag(mc_logfile, File1),
convert_filename_to_working_path(File1, File),
open(File, write, Log),
format(Log,'# goal: ~q~n#delta: ~w~n',[Goal, Delta]),
format(Log,'# samples prob low high time~2n',[]),
close(Log),
problog_collect_trie(Goal, 0.0),
nb_getval(problog_completed_proofs, Trie_Completed_Proofs),
problog_var_timer_start(dnf_sampling_time),
problog_mc_DNF(Trie_Completed_Proofs, Delta, P),
problog_var_timer_stop(dnf_sampling_time),
(problog_flag(verbose, true) ->
print:problog_statistics
;
true
),
ptree:delete_ptree(Trie_Completed_Proofs),
problog:clear_tabling.