diff options
Diffstat (limited to 'extractor')
65 files changed, 2005 insertions, 149 deletions
diff --git a/extractor/Makefile.am b/extractor/Makefile.am index 844c0ef3..ded06239 100644 --- a/extractor/Makefile.am +++ b/extractor/Makefile.am @@ -3,22 +3,27 @@ bin_PROGRAMS = compile run_extractor noinst_PROGRAMS = \ binary_search_merger_test \ data_array_test \ + intersector_test \ linear_merger_test \ matching_comparator_test \ matching_test \ matchings_finder_test \ phrase_test \ precomputation_test \ + sampler_test \ suffix_array_test \ veb_test -TESTS = precomputation_test +TESTS = sampler_test #TESTS = binary_search_merger_test \ # data_array_test \ +# intersector_test \ # linear_merger_test \ # matching_comparator_test \ # matching_test \ +# matchings_finder_test \ # phrase_test \ +# precomputation_test \ # suffix_array_test \ # veb_test @@ -26,6 +31,8 @@ binary_search_merger_test_SOURCES = binary_search_merger_test.cc binary_search_merger_test_LDADD = $(GTEST_LDFLAGS) $(GTEST_LIBS) $(GMOCK_LDFLAGS) $(GMOCK_LIBS) libextractor.a data_array_test_SOURCES = data_array_test.cc data_array_test_LDADD = $(GTEST_LDFLAGS) $(GTEST_LIBS) libextractor.a +intersector_test_SOURCES = intersector_test.cc +intersector_test_LDADD = $(GTEST_LDFLAGS) $(GTEST_LIBS) $(GMOCK_LDFLAGS) $(GMOCK_LIBS) libextractor.a linear_merger_test_SOURCES = linear_merger_test.cc linear_merger_test_LDADD = $(GTEST_LDFLAGS) $(GTEST_LIBS) $(GMOCK_LDFLAGS) $(GMOCK_LIBS) libextractor.a matching_comparator_test_SOURCES = matching_comparator_test.cc @@ -40,6 +47,8 @@ precomputation_test_SOURCES = precomputation_test.cc precomputation_test_LDADD = $(GTEST_LDFLAGS) $(GTEST_LIBS) $(GMOCK_LDFLAGS) $(GMOCK_LIBS) libextractor.a suffix_array_test_SOURCES = suffix_array_test.cc suffix_array_test_LDADD = $(GTEST_LDFLAGS) $(GTEST_LIBS) $(GMOCK_LDFLAGS) $(GMOCK_LIBS) libextractor.a +sampler_test_SOURCES = sampler_test.cc +sampler_test_LDADD = $(GTEST_LDFLAGS) $(GTEST_LIBS) $(GMOCK_LDFLAGS) $(GMOCK_LIBS) libextractor.a veb_test_SOURCES = veb_test.cc veb_test_LDADD = $(GTEST_LDFLAGS) $(GTEST_LIBS) libextractor.a @@ -62,6 +71,15 @@ libextractor_a_SOURCES = \ alignment.cc \ binary_search_merger.cc \ data_array.cc \ + features/count_source_target.cc \ + features/feature.cc \ + features/is_source_singleton.cc \ + features/is_source_target_singleton.cc \ + features/max_lex_source_given_target.cc \ + features/max_lex_target_given_source.cc \ + features/sample_source_count.cc \ + features/target_given_source_coherent.cc \ + grammar.cc \ grammar_extractor.cc \ matching.cc \ matching_comparator.cc \ @@ -73,8 +91,11 @@ libextractor_a_SOURCES = \ phrase_builder.cc \ phrase_location.cc \ precomputation.cc \ + rule.cc \ rule_extractor.cc \ rule_factory.cc \ + sampler.cc \ + scorer.cc \ suffix_array.cc \ translation_table.cc \ veb.cc \ diff --git a/extractor/alignment.cc b/extractor/alignment.cc index cad28a72..2fa0abac 100644 --- a/extractor/alignment.cc +++ b/extractor/alignment.cc @@ -31,7 +31,7 @@ Alignment::Alignment(const string& filename) { alignments.shrink_to_fit(); } -vector<pair<int, int> > Alignment::GetLinks(int sentence_index) const { +const vector<pair<int, int> >& Alignment::GetLinks(int sentence_index) const { return alignments[sentence_index]; } diff --git a/extractor/alignment.h b/extractor/alignment.h index e357e468..290d6015 100644 --- a/extractor/alignment.h +++ b/extractor/alignment.h @@ -13,7 +13,7 @@ class Alignment { public: Alignment(const string& filename); - vector<pair<int, int> > GetLinks(int sentence_index) const; + const vector<pair<int, int> >& GetLinks(int sentence_index) const; void WriteBinary(const fs::path& filepath); diff --git a/extractor/binary_search_merger.cc b/extractor/binary_search_merger.cc index 7b018876..43d2f734 100644 --- a/extractor/binary_search_merger.cc +++ b/extractor/binary_search_merger.cc @@ -19,6 +19,10 @@ BinarySearchMerger::BinarySearchMerger( data_array(data_array), comparator(comparator), force_binary_search_merge(force_binary_search_merge) {} +BinarySearchMerger::BinarySearchMerger() {} + +BinarySearchMerger::~BinarySearchMerger() {} + void BinarySearchMerger::Merge( vector<int>& locations, const Phrase& phrase, const Phrase& suffix, vector<int>::iterator prefix_start, vector<int>::iterator prefix_end, diff --git a/extractor/binary_search_merger.h b/extractor/binary_search_merger.h index 0e229b3b..ffa47c8e 100644 --- a/extractor/binary_search_merger.h +++ b/extractor/binary_search_merger.h @@ -20,7 +20,9 @@ class BinarySearchMerger { shared_ptr<MatchingComparator> comparator, bool force_binary_search_merge = false); - void Merge( + virtual ~BinarySearchMerger(); + + virtual void Merge( vector<int>& locations, const Phrase& phrase, const Phrase& suffix, vector<int>::iterator prefix_start, vector<int>::iterator prefix_end, vector<int>::iterator suffix_start, vector<int>::iterator suffix_end, @@ -28,6 +30,9 @@ class BinarySearchMerger { static double BAEZA_YATES_FACTOR; + protected: + BinarySearchMerger(); + private: bool IsIntersectionVoid( vector<int>::iterator prefix_start, vector<int>::iterator prefix_end, diff --git a/extractor/binary_search_merger_test.cc b/extractor/binary_search_merger_test.cc index 20350b1e..b1baa62f 100644 --- a/extractor/binary_search_merger_test.cc +++ b/extractor/binary_search_merger_test.cc @@ -34,8 +34,8 @@ class BinarySearchMergerTest : public Test { // We are going to force the binary_search_merger to do all the work, so we // need to check that the linear_merger never gets called. - shared_ptr<MockLinearMerger> linear_merger = make_shared<MockLinearMerger>( - vocabulary, data_array, comparator); + shared_ptr<MockLinearMerger> linear_merger = + make_shared<MockLinearMerger>(); EXPECT_CALL(*linear_merger, Merge(_, _, _, _, _, _, _, _, _)).Times(0); binary_search_merger = make_shared<BinarySearchMerger>( diff --git a/extractor/compile.cc b/extractor/compile.cc index c3ea3c8d..f5cd41f4 100644 --- a/extractor/compile.cc +++ b/extractor/compile.cc @@ -77,8 +77,9 @@ int main(int argc, char** argv) { source_suffix_array->WriteBinary(output_dir / fs::path("f.bin")); target_data_array->WriteBinary(output_dir / fs::path("e.bin")); - Alignment alignment(vm["alignment"].as<string>()); - alignment.WriteBinary(output_dir / fs::path("a.bin")); + shared_ptr<Alignment> alignment = + make_shared<Alignment>(vm["alignment"].as<string>()); + alignment->WriteBinary(output_dir / fs::path("a.bin")); Precomputation precomputation( source_suffix_array, diff --git a/extractor/data_array.h b/extractor/data_array.h index 6d3e99d5..19fbff88 100644 --- a/extractor/data_array.h +++ b/extractor/data_array.h @@ -23,8 +23,6 @@ class DataArray { static string END_OF_FILE_STR; static string END_OF_LINE_STR; - DataArray(); - DataArray(const string& filename); DataArray(const string& filename, const Side& side); @@ -43,7 +41,7 @@ class DataArray { virtual int GetWordId(const string& word) const; - string GetWord(int word_id) const; + virtual string GetWord(int word_id) const; int GetNumSentences() const; @@ -55,6 +53,9 @@ class DataArray { void WriteBinary(FILE* file) const; + protected: + DataArray(); + private: void InitializeDataArray(); void CreateDataArray(const vector<string>& lines); diff --git a/extractor/features/count_source_target.cc b/extractor/features/count_source_target.cc new file mode 100644 index 00000000..9441b451 --- /dev/null +++ b/extractor/features/count_source_target.cc @@ -0,0 +1,11 @@ +#include "count_source_target.h" + +#include <cmath> + +double CountSourceTarget::Score(const FeatureContext& context) const { + return log10(1 + context.pair_count); +} + +string CountSourceTarget::GetName() const { + return "CountEF"; +} diff --git a/extractor/features/count_source_target.h b/extractor/features/count_source_target.h new file mode 100644 index 00000000..a2481944 --- /dev/null +++ b/extractor/features/count_source_target.h @@ -0,0 +1,13 @@ +#ifndef _COUNT_SOURCE_TARGET_H_ +#define _COUNT_SOURCE_TARGET_H_ + +#include "feature.h" + +class CountSourceTarget : public Feature { + public: + double Score(const FeatureContext& context) const; + + string GetName() const; +}; + +#endif diff --git a/extractor/features/feature.cc b/extractor/features/feature.cc new file mode 100644 index 00000000..7381c35a --- /dev/null +++ b/extractor/features/feature.cc @@ -0,0 +1,3 @@ +#include "feature.h" + +const double Feature::MAX_SCORE = 99.0; diff --git a/extractor/features/feature.h b/extractor/features/feature.h new file mode 100644 index 00000000..ad22d3e7 --- /dev/null +++ b/extractor/features/feature.h @@ -0,0 +1,32 @@ +#ifndef _FEATURE_H_ +#define _FEATURE_H_ + +#include <string> + +//TODO(pauldb): include headers nicely. +#include "../phrase.h" + +using namespace std; + +struct FeatureContext { + FeatureContext(const Phrase& source_phrase, const Phrase& target_phrase, + double sample_source_count, int pair_count) : + source_phrase(source_phrase), target_phrase(target_phrase), + sample_source_count(sample_source_count), pair_count(pair_count) {} + + Phrase source_phrase; + Phrase target_phrase; + double sample_source_count; + int pair_count; +}; + +class Feature { + public: + virtual double Score(const FeatureContext& context) const = 0; + + virtual string GetName() const = 0; + + static const double MAX_SCORE; +}; + +#endif diff --git a/extractor/features/is_source_singleton.cc b/extractor/features/is_source_singleton.cc new file mode 100644 index 00000000..754df3bf --- /dev/null +++ b/extractor/features/is_source_singleton.cc @@ -0,0 +1,11 @@ +#include "is_source_singleton.h" + +#include <cmath> + +double IsSourceSingleton::Score(const FeatureContext& context) const { + return context.sample_source_count == 1; +} + +string IsSourceSingleton::GetName() const { + return "IsSingletonF"; +} diff --git a/extractor/features/is_source_singleton.h b/extractor/features/is_source_singleton.h new file mode 100644 index 00000000..7cc72828 --- /dev/null +++ b/extractor/features/is_source_singleton.h @@ -0,0 +1,13 @@ +#ifndef _IS_SOURCE_SINGLETON_H_ +#define _IS_SOURCE_SINGLETON_H_ + +#include "feature.h" + +class IsSourceSingleton : public Feature { + public: + double Score(const FeatureContext& context) const; + + string GetName() const; +}; + +#endif diff --git a/extractor/features/is_source_target_singleton.cc b/extractor/features/is_source_target_singleton.cc new file mode 100644 index 00000000..ec816509 --- /dev/null +++ b/extractor/features/is_source_target_singleton.cc @@ -0,0 +1,11 @@ +#include "is_source_target_singleton.h" + +#include <cmath> + +double IsSourceTargetSingleton::Score(const FeatureContext& context) const { + return context.pair_count == 1; +} + +string IsSourceTargetSingleton::GetName() const { + return "IsSingletonEF"; +} diff --git a/extractor/features/is_source_target_singleton.h b/extractor/features/is_source_target_singleton.h new file mode 100644 index 00000000..58913b74 --- /dev/null +++ b/extractor/features/is_source_target_singleton.h @@ -0,0 +1,13 @@ +#ifndef _IS_SOURCE_TARGET_SINGLETON_H_ +#define _IS_SOURCE_TARGET_SINGLETON_H_ + +#include "feature.h" + +class IsSourceTargetSingleton : public Feature { + public: + double Score(const FeatureContext& context) const; + + string GetName() const; +}; + +#endif diff --git a/extractor/features/max_lex_source_given_target.cc b/extractor/features/max_lex_source_given_target.cc new file mode 100644 index 00000000..c4792d49 --- /dev/null +++ b/extractor/features/max_lex_source_given_target.cc @@ -0,0 +1,30 @@ +#include "max_lex_source_given_target.h" + +#include <cmath> + +#include "../translation_table.h" + +MaxLexSourceGivenTarget::MaxLexSourceGivenTarget( + shared_ptr<TranslationTable> table) : + table(table) {} + +double MaxLexSourceGivenTarget::Score(const FeatureContext& context) const { + vector<string> source_words = context.source_phrase.GetWords(); + // TODO(pauldb): Add NULL to target_words, after fixing translation table. + vector<string> target_words = context.target_phrase.GetWords(); + + double score = 0; + for (string source_word: source_words) { + double max_score = 0; + for (string target_word: target_words) { + max_score = max(max_score, + table->GetSourceGivenTargetScore(source_word, target_word)); + } + score += max_score > 0 ? -log10(max_score) : MAX_SCORE; + } + return score; +} + +string MaxLexSourceGivenTarget::GetName() const { + return "MaxLexFGivenE"; +} diff --git a/extractor/features/max_lex_source_given_target.h b/extractor/features/max_lex_source_given_target.h new file mode 100644 index 00000000..e87c1c8e --- /dev/null +++ b/extractor/features/max_lex_source_given_target.h @@ -0,0 +1,24 @@ +#ifndef _MAX_LEX_SOURCE_GIVEN_TARGET_H_ +#define _MAX_LEX_SOURCE_GIVEN_TARGET_H_ + +#include <memory> + +#include "feature.h" + +using namespace std; + +class TranslationTable; + +class MaxLexSourceGivenTarget : public Feature { + public: + MaxLexSourceGivenTarget(shared_ptr<TranslationTable> table); + + double Score(const FeatureContext& context) const; + + string GetName() const; + + private: + shared_ptr<TranslationTable> table; +}; + +#endif diff --git a/extractor/features/max_lex_target_given_source.cc b/extractor/features/max_lex_target_given_source.cc new file mode 100644 index 00000000..d82182fe --- /dev/null +++ b/extractor/features/max_lex_target_given_source.cc @@ -0,0 +1,30 @@ +#include "max_lex_target_given_source.h" + +#include <cmath> + +#include "../translation_table.h" + +MaxLexTargetGivenSource::MaxLexTargetGivenSource( + shared_ptr<TranslationTable> table) : + table(table) {} + +double MaxLexTargetGivenSource::Score(const FeatureContext& context) const { + // TODO(pauldb): Add NULL to source_words, after fixing translation table. + vector<string> source_words = context.source_phrase.GetWords(); + vector<string> target_words = context.target_phrase.GetWords(); + + double score = 0; + for (string target_word: target_words) { + double max_score = 0; + for (string source_word: source_words) { + max_score = max(max_score, + table->GetTargetGivenSourceScore(source_word, target_word)); + } + score += max_score > 0 ? -log10(max_score) : MAX_SCORE; + } + return score; +} + +string MaxLexTargetGivenSource::GetName() const { + return "MaxLexEGivenF"; +} diff --git a/extractor/features/max_lex_target_given_source.h b/extractor/features/max_lex_target_given_source.h new file mode 100644 index 00000000..9585ff04 --- /dev/null +++ b/extractor/features/max_lex_target_given_source.h @@ -0,0 +1,24 @@ +#ifndef _MAX_LEX_TARGET_GIVEN_SOURCE_H_ +#define _MAX_LEX_TARGET_GIVEN_SOURCE_H_ + +#include <memory> + +#include "feature.h" + +using namespace std; + +class TranslationTable; + +class MaxLexTargetGivenSource : public Feature { + public: + MaxLexTargetGivenSource(shared_ptr<TranslationTable> table); + + double Score(const FeatureContext& context) const; + + string GetName() const; + + private: + shared_ptr<TranslationTable> table; +}; + +#endif diff --git a/extractor/features/sample_source_count.cc b/extractor/features/sample_source_count.cc new file mode 100644 index 00000000..c8124cfb --- /dev/null +++ b/extractor/features/sample_source_count.cc @@ -0,0 +1,11 @@ +#include "sample_source_count.h" + +#include <cmath> + +double SampleSourceCount::Score(const FeatureContext& context) const { + return log10(1 + context.sample_source_count); +} + +string SampleSourceCount::GetName() const { + return "SampleCountF"; +} diff --git a/extractor/features/sample_source_count.h b/extractor/features/sample_source_count.h new file mode 100644 index 00000000..62d236c8 --- /dev/null +++ b/extractor/features/sample_source_count.h @@ -0,0 +1,13 @@ +#ifndef _SAMPLE_SOURCE_COUNT_H_ +#define _SAMPLE_SOURCE_COUNT_H_ + +#include "feature.h" + +class SampleSourceCount : public Feature { + public: + double Score(const FeatureContext& context) const; + + string GetName() const; +}; + +#endif diff --git a/extractor/features/target_given_source_coherent.cc b/extractor/features/target_given_source_coherent.cc new file mode 100644 index 00000000..748413c3 --- /dev/null +++ b/extractor/features/target_given_source_coherent.cc @@ -0,0 +1,12 @@ +#include "target_given_source_coherent.h" + +#include <cmath> + +double TargetGivenSourceCoherent::Score(const FeatureContext& context) const { + double prob = context.pair_count / context.sample_source_count; + return prob > 0 ? -log10(prob) : MAX_SCORE; +} + +string TargetGivenSourceCoherent::GetName() const { + return "EGivenFCoherent"; +} diff --git a/extractor/features/target_given_source_coherent.h b/extractor/features/target_given_source_coherent.h new file mode 100644 index 00000000..09c8edb1 --- /dev/null +++ b/extractor/features/target_given_source_coherent.h @@ -0,0 +1,13 @@ +#ifndef _TARGET_GIVEN_SOURCE_COHERENT_H_ +#define _TARGET_GIVEN_SOURCE_COHERENT_H_ + +#include "feature.h" + +class TargetGivenSourceCoherent : public Feature { + public: + double Score(const FeatureContext& context) const; + + string GetName() const; +}; + +#endif diff --git a/extractor/grammar.cc b/extractor/grammar.cc new file mode 100644 index 00000000..79a0541d --- /dev/null +++ b/extractor/grammar.cc @@ -0,0 +1,24 @@ +#include "grammar.h" + +#include "rule.h" + +Grammar::Grammar(const vector<Rule>& rules, + const vector<string>& feature_names) : + rules(rules), feature_names(feature_names) {} + +ostream& operator<<(ostream& os, const Grammar& grammar) { + for (Rule rule: grammar.rules) { + os << "[X] ||| " << rule.source_phrase << " ||| " + << rule.target_phrase << " |||"; + for (size_t i = 0; i < rule.scores.size(); ++i) { + os << " " << grammar.feature_names[i] << "=" << rule.scores[i]; + } + os << " |||"; + for (auto link: rule.alignment) { + os << " " << link.first << "-" << link.second; + } + os << endl; + } + + return os; +} diff --git a/extractor/grammar.h b/extractor/grammar.h new file mode 100644 index 00000000..db15fa7e --- /dev/null +++ b/extractor/grammar.h @@ -0,0 +1,23 @@ +#ifndef _GRAMMAR_H_ +#define _GRAMMAR_H_ + +#include <iostream> +#include <string> +#include <vector> + +using namespace std; + +class Rule; + +class Grammar { + public: + Grammar(const vector<Rule>& rules, const vector<string>& feature_names); + + friend ostream& operator<<(ostream& os, const Grammar& grammar); + + private: + vector<Rule> rules; + vector<string> feature_names; +}; + +#endif diff --git a/extractor/grammar_extractor.cc b/extractor/grammar_extractor.cc index 3014c2e9..15268165 100644 --- a/extractor/grammar_extractor.cc +++ b/extractor/grammar_extractor.cc @@ -4,6 +4,10 @@ #include <sstream> #include <vector> +#include "grammar.h" +#include "rule.h" +#include "vocabulary.h" + using namespace std; vector<string> Tokenize(const string& sentence) { @@ -22,18 +26,20 @@ vector<string> Tokenize(const string& sentence) { GrammarExtractor::GrammarExtractor( shared_ptr<SuffixArray> source_suffix_array, shared_ptr<DataArray> target_data_array, - const Alignment& alignment, const Precomputation& precomputation, - int min_gap_size, int max_rule_span, int max_nonterminals, - int max_rule_symbols, bool use_baeza_yates) : + shared_ptr<Alignment> alignment, shared_ptr<Precomputation> precomputation, + shared_ptr<Scorer> scorer, int min_gap_size, int max_rule_span, + int max_nonterminals, int max_rule_symbols, int max_samples, + bool use_baeza_yates, bool require_tight_phrases) : vocabulary(make_shared<Vocabulary>()), rule_factory(source_suffix_array, target_data_array, alignment, - vocabulary, precomputation, min_gap_size, max_rule_span, - max_nonterminals, max_rule_symbols, use_baeza_yates) {} + vocabulary, precomputation, scorer, min_gap_size, max_rule_span, + max_nonterminals, max_rule_symbols, max_samples, use_baeza_yates, + require_tight_phrases) {} -void GrammarExtractor::GetGrammar(const string& sentence) { +Grammar GrammarExtractor::GetGrammar(const string& sentence) { vector<string> words = Tokenize(sentence); vector<int> word_ids = AnnotateWords(words); - rule_factory.GetGrammar(word_ids); + return rule_factory.GetGrammar(word_ids); } vector<int> GrammarExtractor::AnnotateWords(const vector<string>& words) { diff --git a/extractor/grammar_extractor.h b/extractor/grammar_extractor.h index 05e153fc..243f33cf 100644 --- a/extractor/grammar_extractor.h +++ b/extractor/grammar_extractor.h @@ -5,29 +5,34 @@ #include <vector> #include "rule_factory.h" -#include "vocabulary.h" using namespace std; class Alignment; class DataArray; +class Grammar; class Precomputation; +class Rule; class SuffixArray; +class Vocabulary; class GrammarExtractor { public: GrammarExtractor( shared_ptr<SuffixArray> source_suffix_array, shared_ptr<DataArray> target_data_array, - const Alignment& alignment, - const Precomputation& precomputation, + shared_ptr<Alignment> alignment, + shared_ptr<Precomputation> precomputation, + shared_ptr<Scorer> scorer, int min_gap_size, int max_rule_span, int max_nonterminals, int max_rule_symbols, - bool use_baeza_yates); + int max_samples, + bool use_baeza_yates, + bool require_tight_phrases); - void GetGrammar(const string& sentence); + Grammar GetGrammar(const string& sentence); private: vector<int> AnnotateWords(const vector<string>& words); diff --git a/extractor/intersector.cc b/extractor/intersector.cc index 9d9b54c0..b53479af 100644 --- a/extractor/intersector.cc +++ b/extractor/intersector.cc @@ -10,35 +10,51 @@ #include "vocabulary.h" Intersector::Intersector(shared_ptr<Vocabulary> vocabulary, - const Precomputation& precomputation, + shared_ptr<Precomputation> precomputation, shared_ptr<SuffixArray> suffix_array, shared_ptr<MatchingComparator> comparator, bool use_baeza_yates) : vocabulary(vocabulary), suffix_array(suffix_array), use_baeza_yates(use_baeza_yates) { - linear_merger = make_shared<LinearMerger>( - vocabulary, suffix_array->GetData(), comparator); + shared_ptr<DataArray> data_array = suffix_array->GetData(); + linear_merger = make_shared<LinearMerger>(vocabulary, data_array, comparator); binary_search_merger = make_shared<BinarySearchMerger>( - vocabulary, linear_merger, suffix_array->GetData(), comparator); + vocabulary, linear_merger, data_array, comparator); + ConvertIndexes(precomputation, data_array); +} - shared_ptr<DataArray> source_data_array = suffix_array->GetData(); +Intersector::Intersector(shared_ptr<Vocabulary> vocabulary, + shared_ptr<Precomputation> precomputation, + shared_ptr<SuffixArray> suffix_array, + shared_ptr<LinearMerger> linear_merger, + shared_ptr<BinarySearchMerger> binary_search_merger, + bool use_baeza_yates) : + vocabulary(vocabulary), + suffix_array(suffix_array), + linear_merger(linear_merger), + binary_search_merger(binary_search_merger), + use_baeza_yates(use_baeza_yates) { + ConvertIndexes(precomputation, suffix_array->GetData()); +} - const Index& precomputed_index = precomputation.GetInvertedIndex(); +void Intersector::ConvertIndexes(shared_ptr<Precomputation> precomputation, + shared_ptr<DataArray> data_array) { + const Index& precomputed_index = precomputation->GetInvertedIndex(); for (pair<vector<int>, vector<int> > entry: precomputed_index) { - vector<int> phrase = Convert(entry.first, source_data_array); + vector<int> phrase = ConvertPhrase(entry.first, data_array); inverted_index[phrase] = entry.second; } - const Index& precomputed_collocations = precomputation.GetCollocations(); + const Index& precomputed_collocations = precomputation->GetCollocations(); for (pair<vector<int>, vector<int> > entry: precomputed_collocations) { - vector<int> phrase = Convert(entry.first, source_data_array); + vector<int> phrase = ConvertPhrase(entry.first, data_array); collocations[phrase] = entry.second; } } -vector<int> Intersector::Convert( - const vector<int>& old_phrase, shared_ptr<DataArray> source_data_array) { +vector<int> Intersector::ConvertPhrase(const vector<int>& old_phrase, + shared_ptr<DataArray> data_array) { vector<int> new_phrase; new_phrase.reserve(old_phrase.size()); @@ -49,7 +65,7 @@ vector<int> Intersector::Convert( new_phrase.push_back(vocabulary->GetNonterminalIndex(arity)); } else { new_phrase.push_back( - vocabulary->GetTerminalIndex(source_data_array->GetWord(word_id))); + vocabulary->GetTerminalIndex(data_array->GetWord(word_id))); } } @@ -70,8 +86,7 @@ PhraseLocation Intersector::Intersect( && vocabulary->IsTerminal(symbols.back())); if (collocations.count(symbols)) { - return PhraseLocation(make_shared<vector<int> >(collocations[symbols]), - phrase.Arity()); + return PhraseLocation(collocations[symbols], phrase.Arity() + 1); } vector<int> locations; @@ -91,19 +106,18 @@ PhraseLocation Intersector::Intersect( prefix_matchings->end(), suffix_matchings->begin(), suffix_matchings->end(), prefix_subpatterns, suffix_subpatterns); } - return PhraseLocation(shared_ptr<vector<int> >(new vector<int>(locations)), - phrase.Arity() + 1); + return PhraseLocation(locations, phrase.Arity() + 1); } void Intersector::ExtendPhraseLocation( const Phrase& phrase, PhraseLocation& phrase_location) { int low = phrase_location.sa_low, high = phrase_location.sa_high; - if (phrase.Arity() || phrase_location.num_subpatterns || - phrase_location.IsEmpty()) { + if (phrase_location.matchings != NULL) { return; } phrase_location.num_subpatterns = 1; + phrase_location.sa_low = phrase_location.sa_high = 0; vector<int> symbols = phrase.Get(); if (inverted_index.count(symbols)) { diff --git a/extractor/intersector.h b/extractor/intersector.h index 874ffc1b..f023cc96 100644 --- a/extractor/intersector.h +++ b/extractor/intersector.h @@ -13,8 +13,8 @@ using namespace std; using namespace tr1; -typedef boost::hash<vector<int> > vector_hash; -typedef unordered_map<vector<int>, vector<int>, vector_hash> Index; +typedef boost::hash<vector<int> > VectorHash; +typedef unordered_map<vector<int>, vector<int>, VectorHash> Index; class DataArray; class MatchingComparator; @@ -28,19 +28,31 @@ class Intersector { public: Intersector( shared_ptr<Vocabulary> vocabulary, - const Precomputation& precomputaiton, + shared_ptr<Precomputation> precomputation, shared_ptr<SuffixArray> source_suffix_array, shared_ptr<MatchingComparator> comparator, bool use_baeza_yates); + // For testing. + Intersector( + shared_ptr<Vocabulary> vocabulary, + shared_ptr<Precomputation> precomputation, + shared_ptr<SuffixArray> source_suffix_array, + shared_ptr<LinearMerger> linear_merger, + shared_ptr<BinarySearchMerger> binary_search_merger, + bool use_baeza_yates); + PhraseLocation Intersect( const Phrase& prefix, PhraseLocation& prefix_location, const Phrase& suffix, PhraseLocation& suffix_location, const Phrase& phrase); private: - vector<int> Convert(const vector<int>& old_phrase, - shared_ptr<DataArray> source_data_array); + void ConvertIndexes(shared_ptr<Precomputation> precomputation, + shared_ptr<DataArray> data_array); + + vector<int> ConvertPhrase(const vector<int>& old_phrase, + shared_ptr<DataArray> data_array); void ExtendPhraseLocation(const Phrase& phrase, PhraseLocation& phrase_location); diff --git a/extractor/intersector_test.cc b/extractor/intersector_test.cc new file mode 100644 index 00000000..a3756902 --- /dev/null +++ b/extractor/intersector_test.cc @@ -0,0 +1,193 @@ +#include <gtest/gtest.h> + +#include <memory> +#include <vector> + +#include "intersector.h" +#include "mocks/mock_binary_search_merger.h" +#include "mocks/mock_data_array.h" +#include "mocks/mock_linear_merger.h" +#include "mocks/mock_precomputation.h" +#include "mocks/mock_suffix_array.h" +#include "mocks/mock_vocabulary.h" + +using namespace std; +using namespace ::testing; + +namespace { + +class IntersectorTest : public Test { + protected: + virtual void SetUp() { + data = {2, 3, 4, 3, 4, 3}; + vector<string> words = {"a", "b", "c", "b", "c", "b"}; + data_array = make_shared<MockDataArray>(); + EXPECT_CALL(*data_array, GetData()).WillRepeatedly(ReturnRef(data)); + + vocabulary = make_shared<MockVocabulary>(); + for (size_t i = 0; i < data.size(); ++i) { + EXPECT_CALL(*data_array, GetWord(data[i])) + .WillRepeatedly(Return(words[i])); + EXPECT_CALL(*vocabulary, GetTerminalIndex(words[i])) + .WillRepeatedly(Return(data[i])); + EXPECT_CALL(*vocabulary, GetTerminalValue(data[i])) + .WillRepeatedly(Return(words[i])); + } + + vector<int> suffixes = {0, 1, 3, 5, 2, 4, 6}; + suffix_array = make_shared<MockSuffixArray>(); + EXPECT_CALL(*suffix_array, GetData()) + .WillRepeatedly(Return(data_array)); + EXPECT_CALL(*suffix_array, GetSize()) + .WillRepeatedly(Return(suffixes.size())); + for (size_t i = 0; i < suffixes.size(); ++i) { + EXPECT_CALL(*suffix_array, GetSuffix(i)) + .WillRepeatedly(Return(suffixes[i])); + } + + vector<int> key = {2, -1, 4}; + vector<int> values = {0, 2}; + collocations[key] = values; + precomputation = make_shared<MockPrecomputation>(); + EXPECT_CALL(*precomputation, GetInvertedIndex()) + .WillRepeatedly(ReturnRef(inverted_index)); + EXPECT_CALL(*precomputation, GetCollocations()) + .WillRepeatedly(ReturnRef(collocations)); + + linear_merger = make_shared<MockLinearMerger>(); + binary_search_merger = make_shared<MockBinarySearchMerger>(); + + phrase_builder = make_shared<PhraseBuilder>(vocabulary); + } + + Index inverted_index; + Index collocations; + vector<int> data; + shared_ptr<MockVocabulary> vocabulary; + shared_ptr<MockDataArray> data_array; + shared_ptr<MockSuffixArray> suffix_array; + shared_ptr<MockPrecomputation> precomputation; + shared_ptr<MockLinearMerger> linear_merger; + shared_ptr<MockBinarySearchMerger> binary_search_merger; + shared_ptr<PhraseBuilder> phrase_builder; + shared_ptr<Intersector> intersector; +}; + +TEST_F(IntersectorTest, TestCachedCollocation) { + intersector = make_shared<Intersector>(vocabulary, precomputation, + suffix_array, linear_merger, binary_search_merger, false); + + vector<int> prefix_symbols = {2, -1}; + Phrase prefix = phrase_builder->Build(prefix_symbols); + vector<int> suffix_symbols = {-1, 4}; + Phrase suffix = phrase_builder->Build(suffix_symbols); + vector<int> symbols = {2, -1, 4}; + Phrase phrase = phrase_builder->Build(symbols); + PhraseLocation prefix_locs(0, 1), suffix_locs(2, 3); + + PhraseLocation result = intersector->Intersect( + prefix, prefix_locs, suffix, suffix_locs, phrase); + + vector<int> expected_locs = {0, 2}; + PhraseLocation expected_result(expected_locs, 2); + + EXPECT_EQ(expected_result, result); + EXPECT_EQ(PhraseLocation(0, 1), prefix_locs); + EXPECT_EQ(PhraseLocation(2, 3), suffix_locs); +} + +TEST_F(IntersectorTest, TestLinearMergeaXb) { + vector<int> prefix_symbols = {3, -1}; + Phrase prefix = phrase_builder->Build(prefix_symbols); + vector<int> suffix_symbols = {-1, 4}; + Phrase suffix = phrase_builder->Build(suffix_symbols); + vector<int> symbols = {3, -1, 4}; + Phrase phrase = phrase_builder->Build(symbols); + PhraseLocation prefix_locs(1, 4), suffix_locs(4, 6); + + vector<int> ex_prefix_locs = {1, 3, 5}; + PhraseLocation extended_prefix_locs(ex_prefix_locs, 1); + vector<int> ex_suffix_locs = {2, 4}; + PhraseLocation extended_suffix_locs(ex_suffix_locs, 1); + + vector<int> expected_locs = {1, 4}; + EXPECT_CALL(*linear_merger, Merge(_, _, _, _, _, _, _, _, _)) + .Times(1) + .WillOnce(SetArgReferee<0>(expected_locs)); + EXPECT_CALL(*binary_search_merger, Merge(_, _, _, _, _, _, _, _, _)).Times(0); + + intersector = make_shared<Intersector>(vocabulary, precomputation, + suffix_array, linear_merger, binary_search_merger, false); + + PhraseLocation result = intersector->Intersect( + prefix, prefix_locs, suffix, suffix_locs, phrase); + PhraseLocation expected_result(expected_locs, 2); + + EXPECT_EQ(expected_result, result); + EXPECT_EQ(extended_prefix_locs, prefix_locs); + EXPECT_EQ(extended_suffix_locs, suffix_locs); +} + +TEST_F(IntersectorTest, TestBinarySearchMergeaXb) { + vector<int> prefix_symbols = {3, -1}; + Phrase prefix = phrase_builder->Build(prefix_symbols); + vector<int> suffix_symbols = {-1, 4}; + Phrase suffix = phrase_builder->Build(suffix_symbols); + vector<int> symbols = {3, -1, 4}; + Phrase phrase = phrase_builder->Build(symbols); + PhraseLocation prefix_locs(1, 4), suffix_locs(4, 6); + + vector<int> ex_prefix_locs = {1, 3, 5}; + PhraseLocation extended_prefix_locs(ex_prefix_locs, 1); + vector<int> ex_suffix_locs = {2, 4}; + PhraseLocation extended_suffix_locs(ex_suffix_locs, 1); + + vector<int> expected_locs = {1, 4}; + EXPECT_CALL(*binary_search_merger, Merge(_, _, _, _, _, _, _, _, _)) + .Times(1) + .WillOnce(SetArgReferee<0>(expected_locs)); + EXPECT_CALL(*linear_merger, Merge(_, _, _, _, _, _, _, _, _)).Times(0); + + intersector = make_shared<Intersector>(vocabulary, precomputation, + suffix_array, linear_merger, binary_search_merger, true); + + PhraseLocation result = intersector->Intersect( + prefix, prefix_locs, suffix, suffix_locs, phrase); + PhraseLocation expected_result(expected_locs, 2); + + EXPECT_EQ(expected_result, result); + EXPECT_EQ(extended_prefix_locs, prefix_locs); + EXPECT_EQ(extended_suffix_locs, suffix_locs); +} + +TEST_F(IntersectorTest, TestMergeaXbXc) { + vector<int> prefix_symbols = {2, -1, 4, -1}; + Phrase prefix = phrase_builder->Build(prefix_symbols); + vector<int> suffix_symbols = {-1, 4, -1, 4}; + Phrase suffix = phrase_builder->Build(suffix_symbols); + vector<int> symbols = {2, -1, 4, -1, 4}; + Phrase phrase = phrase_builder->Build(symbols); + + vector<int> ex_prefix_locs = {0, 2, 0, 4}; + PhraseLocation extended_prefix_locs(ex_prefix_locs, 2); + vector<int> ex_suffix_locs = {2, 4}; + PhraseLocation extended_suffix_locs(ex_suffix_locs, 2); + vector<int> expected_locs = {0, 2, 4}; + EXPECT_CALL(*linear_merger, Merge(_, _, _, _, _, _, _, _, _)) + .Times(1) + .WillOnce(SetArgReferee<0>(expected_locs)); + EXPECT_CALL(*binary_search_merger, Merge(_, _, _, _, _, _, _, _, _)).Times(0); + + intersector = make_shared<Intersector>(vocabulary, precomputation, + suffix_array, linear_merger, binary_search_merger, false); + + PhraseLocation result = intersector->Intersect( + prefix, extended_prefix_locs, suffix, extended_suffix_locs, phrase); + PhraseLocation expected_result(expected_locs, 3); + + EXPECT_EQ(expected_result, result); + EXPECT_EQ(ex_prefix_locs, *extended_prefix_locs.matchings); + EXPECT_EQ(ex_suffix_locs, *extended_suffix_locs.matchings); +} + +} // namespace diff --git a/extractor/linear_merger.cc b/extractor/linear_merger.cc index 59e5f34c..666f8d87 100644 --- a/extractor/linear_merger.cc +++ b/extractor/linear_merger.cc @@ -14,6 +14,8 @@ LinearMerger::LinearMerger(shared_ptr<Vocabulary> vocabulary, shared_ptr<MatchingComparator> comparator) : vocabulary(vocabulary), data_array(data_array), comparator(comparator) {} +LinearMerger::LinearMerger() {} + LinearMerger::~LinearMerger() {} void LinearMerger::Merge( diff --git a/extractor/linear_merger.h b/extractor/linear_merger.h index 7bfb9246..6a69b804 100644 --- a/extractor/linear_merger.h +++ b/extractor/linear_merger.h @@ -26,6 +26,9 @@ class LinearMerger { vector<int>::iterator suffix_start, vector<int>::iterator suffix_end, int prefix_subpatterns, int suffix_subpatterns) const; + protected: + LinearMerger(); + private: shared_ptr<Vocabulary> vocabulary; shared_ptr<DataArray> data_array; diff --git a/extractor/mocks/mock_binary_search_merger.h b/extractor/mocks/mock_binary_search_merger.h new file mode 100644 index 00000000..e1375ee3 --- /dev/null +++ b/extractor/mocks/mock_binary_search_merger.h @@ -0,0 +1,15 @@ +#include <gmock/gmock.h> + +#include <vector> + +#include "../binary_search_merger.h" +#include "../phrase.h" + +using namespace std; + +class MockBinarySearchMerger: public BinarySearchMerger { + public: + MOCK_CONST_METHOD9(Merge, void(vector<int>&, const Phrase&, const Phrase&, + vector<int>::iterator, vector<int>::iterator, vector<int>::iterator, + vector<int>::iterator, int, int)); +}; diff --git a/extractor/mocks/mock_data_array.h b/extractor/mocks/mock_data_array.h index cda8f7a6..54497cf5 100644 --- a/extractor/mocks/mock_data_array.h +++ b/extractor/mocks/mock_data_array.h @@ -10,5 +10,6 @@ class MockDataArray : public DataArray { MOCK_CONST_METHOD0(GetVocabularySize, int()); MOCK_CONST_METHOD1(HasWord, bool(const string& word)); MOCK_CONST_METHOD1(GetWordId, int(const string& word)); + MOCK_CONST_METHOD1(GetWord, string(int word_id)); MOCK_CONST_METHOD1(GetSentenceId, int(int position)); }; diff --git a/extractor/mocks/mock_linear_merger.h b/extractor/mocks/mock_linear_merger.h index 0defa88a..82243428 100644 --- a/extractor/mocks/mock_linear_merger.h +++ b/extractor/mocks/mock_linear_merger.h @@ -2,19 +2,13 @@ #include <vector> -#include "linear_merger.h" -#include "phrase.h" +#include "../linear_merger.h" +#include "../phrase.h" using namespace std; class MockLinearMerger: public LinearMerger { public: - MockLinearMerger(shared_ptr<Vocabulary> vocabulary, - shared_ptr<DataArray> data_array, - shared_ptr<MatchingComparator> comparator) : - LinearMerger(vocabulary, data_array, comparator) {} - - MOCK_CONST_METHOD9(Merge, void(vector<int>&, const Phrase&, const Phrase&, vector<int>::iterator, vector<int>::iterator, vector<int>::iterator, vector<int>::iterator, int, int)); diff --git a/extractor/mocks/mock_precomputation.h b/extractor/mocks/mock_precomputation.h new file mode 100644 index 00000000..987bdb2f --- /dev/null +++ b/extractor/mocks/mock_precomputation.h @@ -0,0 +1,9 @@ +#include <gmock/gmock.h> + +#include "../precomputation.h" + +class MockPrecomputation : public Precomputation { + public: + MOCK_CONST_METHOD0(GetInvertedIndex, const Index&()); + MOCK_CONST_METHOD0(GetCollocations, const Index&()); +}; diff --git a/extractor/mocks/mock_suffix_array.h b/extractor/mocks/mock_suffix_array.h index 38d8bad6..11a3a443 100644 --- a/extractor/mocks/mock_suffix_array.h +++ b/extractor/mocks/mock_suffix_array.h @@ -1,5 +1,6 @@ #include <gmock/gmock.h> +#include <memory> #include <string> #include "../data_array.h" @@ -10,8 +11,9 @@ using namespace std; class MockSuffixArray : public SuffixArray { public: - MockSuffixArray() : SuffixArray(make_shared<DataArray>()) {} - MOCK_CONST_METHOD0(GetSize, int()); + MOCK_CONST_METHOD0(GetData, shared_ptr<DataArray>()); + MOCK_CONST_METHOD0(BuildLCPArray, vector<int>()); + MOCK_CONST_METHOD1(GetSuffix, int(int)); MOCK_CONST_METHOD4(Lookup, PhraseLocation(int, int, const string& word, int)); }; diff --git a/extractor/mocks/mock_vocabulary.h b/extractor/mocks/mock_vocabulary.h index 06dea10f..e5c191f5 100644 --- a/extractor/mocks/mock_vocabulary.h +++ b/extractor/mocks/mock_vocabulary.h @@ -5,4 +5,5 @@ class MockVocabulary : public Vocabulary { public: MOCK_METHOD1(GetTerminalValue, string(int word_id)); + MOCK_METHOD1(GetTerminalIndex, int(const string& word)); }; diff --git a/extractor/phrase.cc b/extractor/phrase.cc index f9bd9908..6dc242db 100644 --- a/extractor/phrase.cc +++ b/extractor/phrase.cc @@ -23,3 +23,32 @@ vector<int> Phrase::Get() const { int Phrase::GetSymbol(int position) const { return symbols[position]; } + +int Phrase::GetNumSymbols() const { + return symbols.size(); +} + +vector<string> Phrase::GetWords() const { + return words; +} + +int Phrase::operator<(const Phrase& other) const { + return symbols < other.symbols; +} + +ostream& operator<<(ostream& os, const Phrase& phrase) { + int current_word = 0; + for (size_t i = 0; i < phrase.symbols.size(); ++i) { + if (phrase.symbols[i] < 0) { + os << "[X," << -phrase.symbols[i] << "]"; + } else { + os << phrase.words[current_word]; + ++current_word; + } + + if (i + 1 < phrase.symbols.size()) { + os << " "; + } + } + return os; +} diff --git a/extractor/phrase.h b/extractor/phrase.h index 5a5124d9..f40a8169 100644 --- a/extractor/phrase.h +++ b/extractor/phrase.h @@ -1,6 +1,7 @@ #ifndef _PHRASE_H_ #define _PHRASE_H_ +#include <iostream> #include <string> #include <vector> @@ -20,6 +21,17 @@ class Phrase { int GetSymbol(int position) const; + //TODO(pauldb): Unit test this method. + int GetNumSymbols() const; + + //TODO(pauldb): Add unit tests. + vector<string> GetWords() const; + + //TODO(pauldb): Add unit tests. + int operator<(const Phrase& other) const; + + friend ostream& operator<<(ostream& os, const Phrase& phrase); + private: vector<int> symbols; vector<int> var_pos; diff --git a/extractor/phrase_builder.cc b/extractor/phrase_builder.cc index 7f3447e5..c4e0c2ed 100644 --- a/extractor/phrase_builder.cc +++ b/extractor/phrase_builder.cc @@ -19,3 +19,27 @@ Phrase PhraseBuilder::Build(const vector<int>& symbols) { } return phrase; } + +Phrase PhraseBuilder::Extend(const Phrase& phrase, bool start_x, bool end_x) { + vector<int> symbols = phrase.Get(); + int num_nonterminals = 0; + if (start_x) { + num_nonterminals = 1; + symbols.insert(symbols.begin(), + vocabulary->GetNonterminalIndex(num_nonterminals)); + } + + for (size_t i = start_x; i < symbols.size(); ++i) { + if (vocabulary->IsTerminal(symbols[i])) { + ++num_nonterminals; + symbols[i] = vocabulary->GetNonterminalIndex(num_nonterminals); + } + } + + if (end_x) { + ++num_nonterminals; + symbols.push_back(vocabulary->GetNonterminalIndex(num_nonterminals)); + } + + return Build(symbols); +} diff --git a/extractor/phrase_builder.h b/extractor/phrase_builder.h index f01cb23b..a49af457 100644 --- a/extractor/phrase_builder.h +++ b/extractor/phrase_builder.h @@ -15,6 +15,8 @@ class PhraseBuilder { Phrase Build(const vector<int>& symbols); + Phrase Extend(const Phrase& phrase, bool start_x, bool end_x); + private: shared_ptr<Vocabulary> vocabulary; }; diff --git a/extractor/phrase_location.cc b/extractor/phrase_location.cc index b5b68549..984407c5 100644 --- a/extractor/phrase_location.cc +++ b/extractor/phrase_location.cc @@ -1,16 +1,12 @@ #include "phrase_location.h" -#include <cstdio> - PhraseLocation::PhraseLocation(int sa_low, int sa_high) : - sa_low(sa_low), sa_high(sa_high), - matchings(shared_ptr<vector<int> >()), - num_subpatterns(0) {} + sa_low(sa_low), sa_high(sa_high), num_subpatterns(0) {} -PhraseLocation::PhraseLocation(shared_ptr<vector<int> > matchings, +PhraseLocation::PhraseLocation(const vector<int>& matchings, int num_subpatterns) : sa_high(0), sa_low(0), - matchings(matchings), + matchings(make_shared<vector<int> >(matchings)), num_subpatterns(num_subpatterns) {} bool PhraseLocation::IsEmpty() { diff --git a/extractor/phrase_location.h b/extractor/phrase_location.h index 96004b33..e04d8628 100644 --- a/extractor/phrase_location.h +++ b/extractor/phrase_location.h @@ -9,7 +9,7 @@ using namespace std; struct PhraseLocation { PhraseLocation(int sa_low = -1, int sa_high = -1); - PhraseLocation(shared_ptr<vector<int> > matchings, int num_subpatterns); + PhraseLocation(const vector<int>& matchings, int num_subpatterns); bool IsEmpty(); diff --git a/extractor/precomputation.cc b/extractor/precomputation.cc index 97a70554..9a167976 100644 --- a/extractor/precomputation.cc +++ b/extractor/precomputation.cc @@ -2,11 +2,6 @@ #include <iostream> #include <queue> -#include <tr1/unordered_set> -#include <tuple> -#include <vector> - -#include <boost/functional/hash.hpp> #include "data_array.h" #include "suffix_array.h" @@ -26,9 +21,8 @@ Precomputation::Precomputation( suffix_array, data, num_frequent_patterns, max_frequent_phrase_len, min_frequency); - unordered_set<vector<int>, boost::hash<vector<int> > > frequent_patterns_set; - unordered_set<vector<int>, boost::hash<vector<int> > > - super_frequent_patterns_set; + unordered_set<vector<int>, VectorHash> frequent_patterns_set; + unordered_set<vector<int>, VectorHash> super_frequent_patterns_set; for (size_t i = 0; i < frequent_patterns.size(); ++i) { frequent_patterns_set.insert(frequent_patterns[i]); if (i < num_super_frequent_patterns) { @@ -60,6 +54,10 @@ Precomputation::Precomputation( } } +Precomputation::Precomputation() {} + +Precomputation::~Precomputation() {} + vector<vector<int> > Precomputation::FindMostFrequentPatterns( shared_ptr<SuffixArray> suffix_array, const vector<int>& data, int num_frequent_patterns, int max_frequent_phrase_len, int min_frequency) { @@ -107,7 +105,7 @@ void Precomputation::AddCollocations( } if (start2 - start1 - size1 >= min_gap_size - && start2 + size2 - size1 <= max_rule_span + && start2 + size2 - start1 <= max_rule_span && size1 + size2 + 1 <= max_rule_symbols) { vector<int> pattern(data.begin() + start1, data.begin() + start1 + size1); @@ -126,7 +124,7 @@ void Precomputation::AddCollocations( } if (start3 - start2 - size2 >= min_gap_size - && start3 + size3 - size1 <= max_rule_span + && start3 + size3 - start1 <= max_rule_span && size1 + size2 + size3 + 2 <= max_rule_symbols && (is_super1 || is_super3)) { pattern.insert(pattern.end(), data.begin() + start3, diff --git a/extractor/precomputation.h b/extractor/precomputation.h index 0d1b269f..428505d8 100644 --- a/extractor/precomputation.h +++ b/extractor/precomputation.h @@ -16,8 +16,8 @@ using namespace tr1; class SuffixArray; -typedef boost::hash<vector<int> > vector_hash; -typedef unordered_map<vector<int>, vector<int>, vector_hash> Index; +typedef boost::hash<vector<int> > VectorHash; +typedef unordered_map<vector<int>, vector<int>, VectorHash> Index; class Precomputation { public: @@ -27,20 +27,25 @@ class Precomputation { int max_rule_symbols, int min_gap_size, int max_frequent_phrase_len, int min_frequency); + virtual ~Precomputation(); + void WriteBinary(const fs::path& filepath) const; - const Index& GetInvertedIndex() const; - const Index& GetCollocations() const; + virtual const Index& GetInvertedIndex() const; + virtual const Index& GetCollocations() const; static int NON_TERMINAL; + protected: + Precomputation(); + private: vector<vector<int> > FindMostFrequentPatterns( shared_ptr<SuffixArray> suffix_array, const vector<int>& data, int num_frequent_patterns, int max_frequent_phrase_len, int min_frequency); void AddCollocations( - const vector<tuple<int, int, int> >& matchings, const vector<int>& data, + const vector<std::tuple<int, int, int> >& matchings, const vector<int>& data, int max_rule_span, int min_gap_size, int max_rule_symbols); void AddStartPositions(vector<int>& positions, int pos1, int pos2); void AddStartPositions(vector<int>& positions, int pos1, int pos2, int pos3); diff --git a/extractor/precomputation_test.cc b/extractor/precomputation_test.cc new file mode 100644 index 00000000..9edb29db --- /dev/null +++ b/extractor/precomputation_test.cc @@ -0,0 +1,138 @@ +#include <gtest/gtest.h> + +#include <memory> +#include <vector> + +#include "mocks/mock_data_array.h" +#include "mocks/mock_suffix_array.h" +#include "precomputation.h" + +using namespace std; +using namespace ::testing; + +namespace { + +class PrecomputationTest : public Test { + protected: + virtual void SetUp() { + data = {4, 2, 3, 5, 7, 2, 3, 5, 2, 3, 4, 2, 1}; + data_array = make_shared<MockDataArray>(); + EXPECT_CALL(*data_array, GetData()).WillRepeatedly(ReturnRef(data)); + + vector<int> suffixes{12, 8, 5, 1, 9, 6, 2, 0, 10, 7, 3, 4, 13}; + vector<int> lcp{-1, 0, 2, 3, 1, 0, 1, 2, 0, 2, 0, 1, 0, 0}; + suffix_array = make_shared<MockSuffixArray>(); + EXPECT_CALL(*suffix_array, GetData()).WillRepeatedly(Return(data_array)); + for (size_t i = 0; i < suffixes.size(); ++i) { + EXPECT_CALL(*suffix_array, + GetSuffix(i)).WillRepeatedly(Return(suffixes[i])); + } + EXPECT_CALL(*suffix_array, BuildLCPArray()).WillRepeatedly(Return(lcp)); + } + + vector<int> data; + shared_ptr<MockDataArray> data_array; + shared_ptr<MockSuffixArray> suffix_array; +}; + +TEST_F(PrecomputationTest, TestInvertedIndex) { + Precomputation precomputation(suffix_array, 100, 3, 10, 5, 1, 4, 2); + Index inverted_index = precomputation.GetInvertedIndex(); + + EXPECT_EQ(8, inverted_index.size()); + vector<int> key = {2}; + vector<int> expected_value = {1, 5, 8, 11}; + EXPECT_EQ(expected_value, inverted_index[key]); + key = {3}; + expected_value = {2, 6, 9}; + EXPECT_EQ(expected_value, inverted_index[key]); + key = {4}; + expected_value = {0, 10}; + EXPECT_EQ(expected_value, inverted_index[key]); + key = {5}; + expected_value = {3, 7}; + EXPECT_EQ(expected_value, inverted_index[key]); + key = {4, 2}; + expected_value = {0, 10}; + EXPECT_EQ(expected_value, inverted_index[key]); + key = {2, 3}; + expected_value = {1, 5, 8}; + EXPECT_EQ(expected_value, inverted_index[key]); + key = {3, 5}; + expected_value = {2, 6}; + EXPECT_EQ(expected_value, inverted_index[key]); + key = {2, 3, 5}; + expected_value = {1, 5}; + EXPECT_EQ(expected_value, inverted_index[key]); + + key = {2, 4}; + EXPECT_EQ(0, inverted_index.count(key)); +} + +TEST_F(PrecomputationTest, TestCollocations) { + Precomputation precomputation(suffix_array, 3, 3, 10, 5, 1, 4, 2); + Index collocations = precomputation.GetCollocations(); + + EXPECT_EQ(-1, precomputation.NON_TERMINAL); + vector<int> key = {2, 3, -1, 2}; + vector<int> expected_value = {1, 5, 1, 8, 5, 8, 5, 11, 8, 11}; + EXPECT_EQ(expected_value, collocations[key]); + key = {2, 3, -1, 2, 3}; + expected_value = {1, 5, 1, 8, 5, 8}; + EXPECT_EQ(expected_value, collocations[key]); + key = {2, 3, -1, 3}; + expected_value = {1, 6, 1, 9, 5, 9}; + EXPECT_EQ(expected_value, collocations[key]); + key = {3, -1, 2}; + expected_value = {2, 5, 2, 8, 2, 11, 6, 8, 6, 11, 9, 11}; + EXPECT_EQ(expected_value, collocations[key]); + key = {3, -1, 3}; + expected_value = {2, 6, 2, 9, 6, 9}; + EXPECT_EQ(expected_value, collocations[key]); + key = {3, -1, 2, 3}; + expected_value = {2, 5, 2, 8, 6, 8}; + EXPECT_EQ(expected_value, collocations[key]); + key = {2, -1, 2}; + expected_value = {1, 5, 1, 8, 5, 8, 5, 11, 8, 11}; + EXPECT_EQ(expected_value, collocations[key]); + key = {2, -1, 2, 3}; + expected_value = {1, 5, 1, 8, 5, 8}; + EXPECT_EQ(expected_value, collocations[key]); + key = {2, -1, 3}; + expected_value = {1, 6, 1, 9, 5, 9}; + EXPECT_EQ(expected_value, collocations[key]); + + key = {2, -1, 2, -1, 2}; + expected_value = {1, 5, 8, 5, 8, 11}; + EXPECT_EQ(expected_value, collocations[key]); + key = {2, -1, 2, -1, 3}; + expected_value = {1, 5, 9}; + EXPECT_EQ(expected_value, collocations[key]); + key = {2, -1, 3, -1, 2}; + expected_value = {1, 6, 8, 5, 9, 11}; + EXPECT_EQ(expected_value, collocations[key]); + key = {2, -1, 3, -1, 3}; + expected_value = {1, 6, 9}; + EXPECT_EQ(expected_value, collocations[key]); + key = {3, -1, 2, -1, 2}; + expected_value = {2, 5, 8, 2, 5, 11, 2, 8, 11, 6, 8, 11}; + EXPECT_EQ(expected_value, collocations[key]); + key = {3, -1, 2, -1, 3}; + expected_value = {2, 5, 9}; + EXPECT_EQ(expected_value, collocations[key]); + key = {3, -1, 3, -1, 2}; + expected_value = {2, 6, 8, 2, 6, 11, 2, 9, 11, 6, 9, 11}; + EXPECT_EQ(expected_value, collocations[key]); + key = {3, -1, 3, -1, 3}; + expected_value = {2, 6, 9}; + EXPECT_EQ(expected_value, collocations[key]); + + // Exceeds max_rule_symbols. + key = {2, -1, 2, -1, 2, 3}; + EXPECT_EQ(0, collocations.count(key)); + // Contains non frequent pattern. + key = {2, -1, 5}; + EXPECT_EQ(0, collocations.count(key)); +} + +} // namespace diff --git a/extractor/rule.cc b/extractor/rule.cc new file mode 100644 index 00000000..9c7ac9b5 --- /dev/null +++ b/extractor/rule.cc @@ -0,0 +1,10 @@ +#include "rule.h" + +Rule::Rule(const Phrase& source_phrase, + const Phrase& target_phrase, + const vector<double>& scores, + const vector<pair<int, int> >& alignment) : + source_phrase(source_phrase), + target_phrase(target_phrase), + scores(scores), + alignment(alignment) {} diff --git a/extractor/rule.h b/extractor/rule.h new file mode 100644 index 00000000..64ff8794 --- /dev/null +++ b/extractor/rule.h @@ -0,0 +1,20 @@ +#ifndef _RULE_H_ +#define _RULE_H_ + +#include <vector> + +#include "phrase.h" + +using namespace std; + +struct Rule { + Rule(const Phrase& source_phrase, const Phrase& target_phrase, + const vector<double>& scores, const vector<pair<int, int> >& alignment); + + Phrase source_phrase; + Phrase target_phrase; + vector<double> scores; + vector<pair<int, int> > alignment; +}; + +#endif diff --git a/extractor/rule_extractor.cc b/extractor/rule_extractor.cc index 48b39b63..9460020f 100644 --- a/extractor/rule_extractor.cc +++ b/extractor/rule_extractor.cc @@ -1,10 +1,679 @@ #include "rule_extractor.h" +#include <map> +#include <tr1/unordered_set> + +#include "alignment.h" +#include "data_array.h" +#include "features/feature.h" +#include "phrase_builder.h" +#include "phrase_location.h" +#include "rule.h" +#include "scorer.h" +#include "vocabulary.h" + +using namespace std; +using namespace tr1; + RuleExtractor::RuleExtractor( - shared_ptr<SuffixArray> source_suffix_array, + shared_ptr<DataArray> source_data_array, shared_ptr<DataArray> target_data_array, - const Alignment& alingment) { + shared_ptr<Alignment> alignment, + shared_ptr<PhraseBuilder> phrase_builder, + shared_ptr<Scorer> scorer, + shared_ptr<Vocabulary> vocabulary, + int max_rule_span, + int min_gap_size, + int max_nonterminals, + int max_rule_symbols, + bool require_aligned_terminal, + bool require_aligned_chunks, + bool require_tight_phrases) : + source_data_array(source_data_array), + target_data_array(target_data_array), + alignment(alignment), + phrase_builder(phrase_builder), + scorer(scorer), + vocabulary(vocabulary), + max_rule_span(max_rule_span), + min_gap_size(min_gap_size), + max_nonterminals(max_nonterminals), + max_rule_symbols(max_rule_symbols), + require_aligned_terminal(require_aligned_terminal), + require_aligned_chunks(require_aligned_chunks), + require_tight_phrases(require_tight_phrases) {} + +vector<Rule> RuleExtractor::ExtractRules(const Phrase& phrase, + const PhraseLocation& location) const { + int num_subpatterns = location.num_subpatterns; + vector<int> matchings = *location.matchings; + + map<Phrase, double> source_phrase_counter; + map<Phrase, map<Phrase, map<PhraseAlignment, int> > > alignments_counter; + for (auto i = matchings.begin(); i != matchings.end(); i += num_subpatterns) { + vector<int> matching(i, i + num_subpatterns); + vector<Extract> extracts = ExtractAlignments(phrase, matching); + + for (Extract e: extracts) { + source_phrase_counter[e.source_phrase] += e.pairs_count; + alignments_counter[e.source_phrase][e.target_phrase][e.alignment] += 1; + } + } + + vector<Rule> rules; + for (auto source_phrase_entry: alignments_counter) { + Phrase source_phrase = source_phrase_entry.first; + for (auto target_phrase_entry: source_phrase_entry.second) { + Phrase target_phrase = target_phrase_entry.first; + + int max_locations = 0, num_locations = 0; + PhraseAlignment most_frequent_alignment; + for (auto alignment_entry: target_phrase_entry.second) { + num_locations += alignment_entry.second; + if (alignment_entry.second > max_locations) { + most_frequent_alignment = alignment_entry.first; + max_locations = alignment_entry.second; + } + } + + FeatureContext context(source_phrase, target_phrase, + source_phrase_counter[source_phrase], num_locations); + vector<double> scores = scorer->Score(context); + rules.push_back(Rule(source_phrase, target_phrase, scores, + most_frequent_alignment)); + } + } + return rules; +} + +vector<Extract> RuleExtractor::ExtractAlignments( + const Phrase& phrase, const vector<int>& matching) const { + vector<Extract> extracts; + int sentence_id = source_data_array->GetSentenceId(matching[0]); + int source_sent_start = source_data_array->GetSentenceStart(sentence_id); + + vector<int> source_low, source_high, target_low, target_high; + GetLinksSpans(source_low, source_high, target_low, target_high, sentence_id); + + int num_subpatterns = matching.size(); + vector<int> chunklen(num_subpatterns); + for (size_t i = 0; i < num_subpatterns; ++i) { + chunklen[i] = phrase.GetChunkLen(i); + } + + if (!CheckAlignedTerminals(matching, chunklen, source_low) || + !CheckTightPhrases(matching, chunklen, source_low)) { + return extracts; + } + + int source_back_low = -1, source_back_high = -1; + int source_phrase_low = matching[0] - source_sent_start; + int source_phrase_high = matching.back() + chunklen.back() - source_sent_start; + int target_phrase_low = -1, target_phrase_high = -1; + if (!FindFixPoint(source_phrase_low, source_phrase_high, source_low, + source_high, target_phrase_low, target_phrase_high, + target_low, target_high, source_back_low, source_back_high, + sentence_id, min_gap_size, 0, + max_nonterminals - matching.size() + 1, 1, 1, false)) { + return extracts; + } + + bool met_constraints = true; + int num_symbols = phrase.GetNumSymbols(); + vector<pair<int, int> > source_gaps, target_gaps; + if (!CheckGaps(source_gaps, target_gaps, matching, chunklen, source_low, + source_high, target_low, target_high, source_phrase_low, + source_phrase_high, source_back_low, source_back_high, + num_symbols, met_constraints)) { + return extracts; + } + + bool start_x = source_back_low != source_phrase_low; + bool end_x = source_back_high != source_phrase_high; + Phrase source_phrase = phrase_builder->Extend(phrase, start_x, end_x); + if (met_constraints) { + AddExtracts(extracts, source_phrase, target_gaps, target_low, + target_phrase_low, target_phrase_high, sentence_id); + } + + if (source_gaps.size() >= max_nonterminals || + source_phrase.GetNumSymbols() >= max_rule_symbols || + source_back_high - source_back_low + min_gap_size > max_rule_span) { + // Cannot add any more nonterminals. + return extracts; + } + + for (int i = 0; i < 2; ++i) { + for (int j = 1 - i; j < 2; ++j) { + AddNonterminalExtremities(extracts, source_phrase, source_phrase_low, + source_phrase_high, source_back_low, source_back_high, source_low, + source_high, target_low, target_high, target_gaps, sentence_id, i, j); + } + } + + return extracts; +} + +void RuleExtractor::GetLinksSpans( + vector<int>& source_low, vector<int>& source_high, + vector<int>& target_low, vector<int>& target_high, int sentence_id) const { + // Ignore end of line markers. + int source_sent_len = source_data_array->GetSentenceStart(sentence_id + 1) - + source_data_array->GetSentenceStart(sentence_id) - 1; + int target_sent_len = target_data_array->GetSentenceStart(sentence_id + 1) - + target_data_array->GetSentenceStart(sentence_id) - 1; + source_low = vector<int>(source_sent_len, -1); + source_high = vector<int>(source_sent_len, -1); + + // TODO(pauldb): Adam Lopez claims this part is really inefficient. See if we + // can speed it up. + target_low = vector<int>(target_sent_len, -1); + target_high = vector<int>(target_sent_len, -1); + const vector<pair<int, int> >& links = alignment->GetLinks(sentence_id); + for (auto link: links) { + if (source_low[link.first] == -1 || source_low[link.first] > link.second) { + source_low[link.first] = link.second; + } + source_high[link.first] = max(source_high[link.first], link.second + 1); + + if (target_low[link.second] == -1 || target_low[link.second] > link.first) { + target_low[link.second] = link.first; + } + target_high[link.second] = max(target_high[link.second], link.first + 1); + } +} + +bool RuleExtractor::CheckAlignedTerminals(const vector<int>& matching, + const vector<int>& chunklen, + const vector<int>& source_low) const { + if (!require_aligned_terminal) { + return true; + } + + int sentence_id = source_data_array->GetSentenceId(matching[0]); + int source_sent_start = source_data_array->GetSentenceStart(sentence_id); + + int num_aligned_chunks = 0; + for (size_t i = 0; i < chunklen.size(); ++i) { + for (size_t j = 0; j < chunklen[i]; ++j) { + int sent_index = matching[i] - source_sent_start + j; + if (source_low[sent_index] != -1) { + ++num_aligned_chunks; + break; + } + } + } + + if (num_aligned_chunks == 0) { + return false; + } + + return !require_aligned_chunks || num_aligned_chunks == chunklen.size(); +} + +bool RuleExtractor::CheckTightPhrases(const vector<int>& matching, + const vector<int>& chunklen, + const vector<int>& source_low) const { + if (!require_tight_phrases) { + return true; + } + + int sentence_id = source_data_array->GetSentenceId(matching[0]); + int source_sent_start = source_data_array->GetSentenceStart(sentence_id); + for (size_t i = 0; i + 1 < chunklen.size(); ++i) { + int gap_start = matching[i] + chunklen[i] - source_sent_start; + int gap_end = matching[i + 1] - 1 - source_sent_start; + if (source_low[gap_start] == -1 || source_low[gap_end] == -1) { + return false; + } + } + + return true; +} + +bool RuleExtractor::FindFixPoint( + int source_phrase_low, int source_phrase_high, + const vector<int>& source_low, const vector<int>& source_high, + int& target_phrase_low, int& target_phrase_high, + const vector<int>& target_low, const vector<int>& target_high, + int& source_back_low, int& source_back_high, int sentence_id, + int min_source_gap_size, int min_target_gap_size, + int max_new_x, int max_low_x, int max_high_x, + bool allow_arbitrary_expansion) const { + int source_sent_len = source_data_array->GetSentenceStart(sentence_id + 1) - + source_data_array->GetSentenceStart(sentence_id) - 1; + int target_sent_len = target_data_array->GetSentenceStart(sentence_id + 1) - + target_data_array->GetSentenceStart(sentence_id) - 1; + + int prev_target_low = target_phrase_low; + int prev_target_high = target_phrase_high; + FindProjection(source_phrase_low, source_phrase_high, source_low, + source_high, target_phrase_low, target_phrase_high); + + if (target_phrase_low == -1) { + // TODO(pauldb): Low priority corner case inherited from Adam's code: + // If w is unaligned, but we don't require aligned terminals, returning an + // error here prevents the extraction of the allowed rule + // X -> X_1 w X_2 / X_1 X_2 + return false; + } + + if (prev_target_low != -1 && target_phrase_low != prev_target_low) { + if (prev_target_low - target_phrase_low < min_target_gap_size) { + target_phrase_low = prev_target_low - min_target_gap_size; + if (target_phrase_low < 0) { + return false; + } + } + } + + if (prev_target_high != -1 && target_phrase_high != prev_target_high) { + if (target_phrase_high - prev_target_high < min_target_gap_size) { + target_phrase_high = prev_target_high + min_target_gap_size; + if (target_phrase_high > target_sent_len) { + return false; + } + } + } + + if (target_phrase_high - target_phrase_low > max_rule_span) { + return false; + } + + source_back_low = source_back_high = -1; + FindProjection(target_phrase_low, target_phrase_high, target_low, target_high, + source_back_low, source_back_high); + int new_x = 0, new_low_x = 0, new_high_x = 0; + + while (true) { + source_back_low = min(source_back_low, source_phrase_low); + source_back_high = max(source_back_high, source_phrase_high); + + if (source_back_low == source_phrase_low && + source_back_high == source_phrase_high) { + return true; + } + + if (new_low_x >= max_low_x && source_back_low < source_phrase_low) { + // Extension on the left side not allowed. + return false; + } + if (new_high_x >= max_high_x && source_back_high > source_phrase_high) { + // Extension on the right side not allowed. + return false; + } + + // Extend left side. + if (source_back_low < source_phrase_low) { + if (new_x >= max_new_x) { + return false; + } + ++new_x; ++new_low_x; + if (source_phrase_low - source_back_low < min_source_gap_size) { + source_back_low = source_phrase_low - min_source_gap_size; + if (source_back_low < 0) { + return false; + } + } + } + + // Extend right side. + if (source_back_high > source_phrase_high) { + if (new_x >= max_new_x) { + return false; + } + ++new_x; ++new_high_x; + if (source_back_high - source_phrase_high < min_source_gap_size) { + source_back_high = source_phrase_high + min_source_gap_size; + if (source_back_high > source_sent_len) { + return false; + } + } + } + + if (source_back_high - source_back_low > max_rule_span) { + // Rule span too wide. + return false; + } + + prev_target_low = target_phrase_low; + prev_target_high = target_phrase_high; + FindProjection(source_back_low, source_phrase_low, source_low, source_high, + target_phrase_low, target_phrase_high); + FindProjection(source_phrase_high, source_back_high, source_low, + source_high, target_phrase_low, target_phrase_high); + if (prev_target_low == target_phrase_low && + prev_target_high == target_phrase_high) { + return true; + } + + if (!allow_arbitrary_expansion) { + // Arbitrary expansion not allowed. + return false; + } + if (target_phrase_high - target_phrase_low > max_rule_span) { + // Target side too wide. + return false; + } + + source_phrase_low = source_back_low; + source_phrase_high = source_back_high; + FindProjection(target_phrase_low, prev_target_low, target_low, target_high, + source_back_low, source_back_high); + FindProjection(prev_target_high, target_phrase_high, target_low, + target_high, source_back_low, source_back_high); + } + + return false; +} + +void RuleExtractor::FindProjection( + int source_phrase_low, int source_phrase_high, + const vector<int>& source_low, const vector<int>& source_high, + int& target_phrase_low, int& target_phrase_high) const { + for (size_t i = source_phrase_low; i < source_phrase_high; ++i) { + if (source_low[i] != -1) { + if (target_phrase_low == -1 || source_low[i] < target_phrase_low) { + target_phrase_low = source_low[i]; + } + target_phrase_high = max(target_phrase_high, source_high[i]); + } + } } -void RuleExtractor::ExtractRules() { +bool RuleExtractor::CheckGaps( + vector<pair<int, int> >& source_gaps, vector<pair<int, int> >& target_gaps, + const vector<int>& matching, const vector<int>& chunklen, + const vector<int>& source_low, const vector<int>& source_high, + const vector<int>& target_low, const vector<int>& target_high, + int source_phrase_low, int source_phrase_high, int source_back_low, + int source_back_high, int& num_symbols, bool& met_constraints) const { + int sentence_id = source_data_array->GetSentenceId(matching[0]); + int source_sent_start = source_data_array->GetSentenceStart(sentence_id); + + if (source_back_low < source_phrase_low) { + source_gaps.push_back(make_pair(source_back_low, source_phrase_low)); + if (num_symbols >= max_rule_symbols) { + // Source side contains too many symbols. + return false; + } + ++num_symbols; + if (require_tight_phrases && (source_low[source_back_low] == -1 || + source_low[source_phrase_low - 1] == -1)) { + // Inside edges of preceding gap are not tight. + return false; + } + } else if (require_tight_phrases && source_low[source_phrase_low] == -1) { + // This is not a hard error. We can't extract this phrase, but we might + // still be able to extract a superphrase. + met_constraints = false; + } + + for (size_t i = 0; i + 1 < chunklen.size(); ++i) { + int gap_start = matching[i] + chunklen[i] - source_sent_start; + int gap_end = matching[i + 1] - source_sent_start; + source_gaps.push_back(make_pair(gap_start, gap_end)); + } + + if (source_phrase_high < source_back_high) { + source_gaps.push_back(make_pair(source_phrase_high, source_back_high)); + if (num_symbols >= max_rule_symbols) { + // Source side contains too many symbols. + return false; + } + ++num_symbols; + if (require_tight_phrases && (source_low[source_phrase_high] == -1 || + source_low[source_back_high - 1] == -1)) { + // Inside edges of following gap are not tight. + return false; + } + } else if (require_tight_phrases && + source_low[source_phrase_high - 1] == -1) { + // This is not a hard error. We can't extract this phrase, but we might + // still be able to extract a superphrase. + met_constraints = false; + } + + target_gaps.resize(source_gaps.size(), make_pair(-1, -1)); + for (size_t i = 0; i < source_gaps.size(); ++i) { + if (!FindFixPoint(source_gaps[i].first, source_gaps[i].second, source_low, + source_high, target_gaps[i].first, target_gaps[i].second, + target_low, target_high, source_gaps[i].first, + source_gaps[i].second, sentence_id, 0, 0, 0, 0, 0, + false)) { + // Gap fails integrity check. + return false; + } + } + + return true; +} + +void RuleExtractor::AddExtracts( + vector<Extract>& extracts, const Phrase& source_phrase, + const vector<pair<int, int> >& target_gaps, const vector<int>& target_low, + int target_phrase_low, int target_phrase_high, int sentence_id) const { + vector<pair<Phrase, PhraseAlignment> > target_phrases = ExtractTargetPhrases( + target_gaps, target_low, target_phrase_low, target_phrase_high, + sentence_id); + + if (target_phrases.size() > 0) { + double pairs_count = 1.0 / target_phrases.size(); + for (auto target_phrase: target_phrases) { + extracts.push_back(Extract(source_phrase, target_phrase.first, + pairs_count, target_phrase.second)); + } + } +} + +vector<pair<Phrase, PhraseAlignment> > RuleExtractor::ExtractTargetPhrases( + const vector<pair<int, int> >& target_gaps, const vector<int>& target_low, + int target_phrase_low, int target_phrase_high, int sentence_id) const { + int target_sent_len = target_data_array->GetSentenceStart(sentence_id + 1) - + target_data_array->GetSentenceStart(sentence_id) - 1; + + vector<int> target_gap_order(target_gaps.size()); + for (size_t i = 0; i < target_gap_order.size(); ++i) { + for (size_t j = 0; j < i; ++j) { + if (target_gaps[target_gap_order[j]] < target_gaps[i]) { + ++target_gap_order[i]; + } else { + ++target_gap_order[j]; + } + } + } + + int target_x_low = target_phrase_low, target_x_high = target_phrase_high; + if (!require_tight_phrases) { + while (target_x_low > 0 && + target_phrase_high - target_x_low < max_rule_span && + target_low[target_x_low - 1] == -1) { + --target_x_low; + } + while (target_x_high + 1 < target_sent_len && + target_x_high - target_phrase_low < max_rule_span && + target_low[target_x_high + 1] == -1) { + ++target_x_high; + } + } + + vector<pair<int, int> > gaps(target_gaps.size()); + for (size_t i = 0; i < gaps.size(); ++i) { + gaps[i] = target_gaps[target_gap_order[i]]; + if (!require_tight_phrases) { + while (gaps[i].first > target_x_low && + target_low[gaps[i].first] == -1) { + --gaps[i].first; + } + while (gaps[i].second < target_x_high && + target_low[gaps[i].second] == -1) { + ++gaps[i].second; + } + } + } + + vector<pair<int, int> > ranges(2 * gaps.size() + 2); + ranges.front() = make_pair(target_x_low, target_phrase_low); + ranges.back() = make_pair(target_phrase_high, target_x_high); + for (size_t i = 0; i < gaps.size(); ++i) { + ranges[i * 2 + 1] = make_pair(gaps[i].first, target_gaps[i].first); + ranges[i * 2 + 2] = make_pair(target_gaps[i].second, gaps[i].second); + } + + vector<pair<Phrase, PhraseAlignment> > target_phrases; + vector<int> subpatterns(ranges.size()); + GeneratePhrases(target_phrases, ranges, 0, subpatterns, target_gap_order, + target_phrase_low, target_phrase_high, sentence_id); + return target_phrases; +} + +void RuleExtractor::GeneratePhrases( + vector<pair<Phrase, PhraseAlignment> >& target_phrases, + const vector<pair<int, int> >& ranges, int index, vector<int>& subpatterns, + const vector<int>& target_gap_order, int target_phrase_low, + int target_phrase_high, int sentence_id) const { + if (index >= ranges.size()) { + if (subpatterns.back() - subpatterns.front() > max_rule_span) { + return; + } + + vector<int> symbols; + unordered_set<int> target_indexes; + int offset = 1; + if (subpatterns.front() != target_phrase_low) { + offset = 2; + symbols.push_back(vocabulary->GetNonterminalIndex(1)); + } + + int target_sent_start = target_data_array->GetSentenceStart(sentence_id); + for (size_t i = 0; i * 2 < subpatterns.size(); ++i) { + for (size_t j = subpatterns[i * 2]; j < subpatterns[i * 2 + 1]; ++j) { + symbols.push_back(target_data_array->AtIndex(target_sent_start + j)); + target_indexes.insert(j); + } + if (i < target_gap_order.size()) { + symbols.push_back(vocabulary->GetNonterminalIndex( + target_gap_order[i] + offset)); + } + } + + if (subpatterns.back() != target_phrase_high) { + symbols.push_back(target_gap_order.size() + offset); + } + + const vector<pair<int, int> >& links = alignment->GetLinks(sentence_id); + vector<pair<int, int> > alignment; + for (pair<int, int> link: links) { + if (target_indexes.count(link.second)) { + alignment.push_back(link); + } + } + + target_phrases.push_back(make_pair(phrase_builder->Build(symbols), + alignment)); + return; + } + + subpatterns[index] = ranges[index].first; + if (index > 0) { + subpatterns[index] = max(subpatterns[index], subpatterns[index - 1]); + } + while (subpatterns[index] <= ranges[index].second) { + subpatterns[index + 1] = max(subpatterns[index], ranges[index + 1].first); + while (subpatterns[index + 1] <= ranges[index + 1].second) { + GeneratePhrases(target_phrases, ranges, index + 2, subpatterns, + target_gap_order, target_phrase_low, target_phrase_high, + sentence_id); + ++subpatterns[index + 1]; + } + ++subpatterns[index]; + } +} + +void RuleExtractor::AddNonterminalExtremities( + vector<Extract>& extracts, const Phrase& source_phrase, + int source_phrase_low, int source_phrase_high, int source_back_low, + int source_back_high, const vector<int>& source_low, + const vector<int>& source_high, const vector<int>& target_low, + const vector<int>& target_high, const vector<pair<int, int> >& target_gaps, + int sentence_id, int extend_left, int extend_right) const { + int source_x_low = source_phrase_low, source_x_high = source_phrase_high; + if (extend_left) { + if (source_back_low != source_phrase_low || + source_phrase_low < min_gap_size || + (require_tight_phrases && (source_low[source_phrase_low - 1] == -1 || + source_low[source_back_high - 1] == -1))) { + return; + } + + source_x_low = source_phrase_low - min_gap_size; + if (require_tight_phrases) { + while (source_x_low >= 0 && source_low[source_x_low] == -1) { + --source_x_low; + } + } + if (source_x_low < 0) { + return; + } + } + + if (extend_right) { + int source_sent_len = source_data_array->GetSentenceStart(sentence_id + 1) - + source_data_array->GetSentenceStart(sentence_id) - 1; + if (source_back_high != source_phrase_high || + source_phrase_high + min_gap_size > source_sent_len || + (require_tight_phrases && (source_low[source_phrase_low] == -1 || + source_low[source_phrase_high] == -1))) { + return; + } + source_x_high = source_phrase_high + min_gap_size; + if (require_tight_phrases) { + while (source_x_high <= source_sent_len && + source_low[source_x_high - 1] == -1) { + ++source_x_high; + } + } + + if (source_x_high > source_sent_len) { + return; + } + } + + if (source_x_high - source_x_low > max_rule_span || + target_gaps.size() + extend_left + extend_right > max_nonterminals) { + return; + } + + int target_x_low = -1, target_x_high = -1; + if (!FindFixPoint(source_x_low, source_x_high, source_low, source_high, + target_x_low, target_x_high, target_low, target_high, + source_x_low, source_x_high, sentence_id, 1, 1, + extend_left + extend_right, extend_left, extend_right, + true)) { + return; + } + + int source_gap_low = -1, source_gap_high = -1, target_gap_low = -1, + target_gap_high = -1; + if (extend_left && + ((require_tight_phrases && source_low[source_x_low] == -1) || + !FindFixPoint(source_x_low, source_phrase_low, source_low, source_high, + target_gap_low, target_gap_high, target_low, target_high, + source_gap_low, source_gap_high, sentence_id, + 0, 0, 0, 0, 0, false))) { + return; + } + if (extend_right && + ((require_tight_phrases && source_low[source_x_high - 1] == -1) || + !FindFixPoint(source_phrase_high, source_x_high, source_low, source_high, + target_gap_low, target_gap_high, target_low, target_high, + source_gap_low, source_gap_high, sentence_id, + 0, 0, 0, 0, 0, false))) { + return; + } + + Phrase new_source_phrase = phrase_builder->Extend(source_phrase, extend_left, + extend_right); + AddExtracts(extracts, new_source_phrase, target_gaps, target_low, + target_x_low, target_x_high, sentence_id); } diff --git a/extractor/rule_extractor.h b/extractor/rule_extractor.h index 13b5447a..f668de24 100644 --- a/extractor/rule_extractor.h +++ b/extractor/rule_extractor.h @@ -2,21 +2,129 @@ #define _RULE_EXTRACTOR_H_ #include <memory> +#include <vector> + +#include "phrase.h" using namespace std; class Alignment; class DataArray; -class SuffixArray; +class PhraseBuilder; +class PhraseLocation; +class Rule; +class Scorer; +class Vocabulary; + +typedef vector<pair<int, int> > PhraseAlignment; + +struct Extract { + Extract(const Phrase& source_phrase, const Phrase& target_phrase, + double pairs_count, const PhraseAlignment& alignment) : + source_phrase(source_phrase), target_phrase(target_phrase), + pairs_count(pairs_count), alignment(alignment) {} + + Phrase source_phrase; + Phrase target_phrase; + double pairs_count; + PhraseAlignment alignment; +}; class RuleExtractor { public: - RuleExtractor( - shared_ptr<SuffixArray> source_suffix_array, - shared_ptr<DataArray> target_data_array, - const Alignment& alingment); + RuleExtractor(shared_ptr<DataArray> source_data_array, + shared_ptr<DataArray> target_data_array, + shared_ptr<Alignment> alingment, + shared_ptr<PhraseBuilder> phrase_builder, + shared_ptr<Scorer> scorer, + shared_ptr<Vocabulary> vocabulary, + int min_gap_size, + int max_rule_span, + int max_nonterminals, + int max_rule_symbols, + bool require_aligned_terminal, + bool require_aligned_chunks, + bool require_tight_phrases); + + vector<Rule> ExtractRules(const Phrase& phrase, + const PhraseLocation& location) const; + + private: + vector<Extract> ExtractAlignments(const Phrase& phrase, + const vector<int>& matching) const; + + void GetLinksSpans(vector<int>& source_low, vector<int>& source_high, + vector<int>& target_low, vector<int>& target_high, + int sentence_id) const; + + bool CheckAlignedTerminals(const vector<int>& matching, + const vector<int>& chunklen, + const vector<int>& source_low) const; + + bool CheckTightPhrases(const vector<int>& matching, + const vector<int>& chunklen, + const vector<int>& source_low) const; + + bool FindFixPoint( + int source_phrase_start, int source_phrase_end, + const vector<int>& source_low, const vector<int>& source_high, + int& target_phrase_start, int& target_phrase_end, + const vector<int>& target_low, const vector<int>& target_high, + int& source_back_low, int& source_back_high, int sentence_id, + int min_source_gap_size, int min_target_gap_size, + int max_new_x, int max_low_x, int max_high_x, + bool allow_arbitrary_expansion) const; + + void FindProjection( + int source_phrase_start, int source_phrase_end, + const vector<int>& source_low, const vector<int>& source_high, + int& target_phrase_low, int& target_phrase_end) const; + + bool CheckGaps( + vector<pair<int, int> >& source_gaps, vector<pair<int, int> >& target_gaps, + const vector<int>& matching, const vector<int>& chunklen, + const vector<int>& source_low, const vector<int>& source_high, + const vector<int>& target_low, const vector<int>& target_high, + int source_phrase_low, int source_phrase_high, int source_back_low, + int source_back_high, int& num_symbols, bool& met_constraints) const; + + void AddExtracts( + vector<Extract>& extracts, const Phrase& source_phrase, + const vector<pair<int, int> >& target_gaps, const vector<int>& target_low, + int target_phrase_low, int target_phrase_high, int sentence_id) const; + + vector<pair<Phrase, PhraseAlignment> > ExtractTargetPhrases( + const vector<pair<int, int> >& target_gaps, const vector<int>& target_low, + int target_phrase_low, int target_phrase_high, int sentence_id) const; + + void GeneratePhrases( + vector<pair<Phrase, PhraseAlignment> >& target_phrases, + const vector<pair<int, int> >& ranges, int index, + vector<int>& subpatterns, const vector<int>& target_gap_order, + int target_phrase_low, int target_phrase_high, int sentence_id) const; + + void AddNonterminalExtremities( + vector<Extract>& extracts, const Phrase& source_phrase, + int source_phrase_low, int source_phrase_high, int source_back_low, + int source_back_high, const vector<int>& source_low, + const vector<int>& source_high, const vector<int>& target_low, + const vector<int>& target_high, + const vector<pair<int, int> >& target_gaps, int sentence_id, + int extend_left, int extend_right) const; - void ExtractRules(); + shared_ptr<DataArray> source_data_array; + shared_ptr<DataArray> target_data_array; + shared_ptr<Alignment> alignment; + shared_ptr<PhraseBuilder> phrase_builder; + shared_ptr<Scorer> scorer; + shared_ptr<Vocabulary> vocabulary; + int max_rule_span; + int min_gap_size; + int max_nonterminals; + int max_rule_symbols; + bool require_aligned_terminal; + bool require_aligned_chunks; + bool require_tight_phrases; }; #endif diff --git a/extractor/rule_factory.cc b/extractor/rule_factory.cc index 7a8356b8..c22f9b48 100644 --- a/extractor/rule_factory.cc +++ b/extractor/rule_factory.cc @@ -5,8 +5,15 @@ #include <queue> #include <vector> +#include "grammar.h" +#include "intersector.h" +#include "matchings_finder.h" #include "matching_comparator.h" #include "phrase.h" +#include "rule.h" +#include "rule_extractor.h" +#include "sampler.h" +#include "scorer.h" #include "suffix_array.h" #include "vocabulary.h" @@ -30,28 +37,39 @@ struct State { HieroCachingRuleFactory::HieroCachingRuleFactory( shared_ptr<SuffixArray> source_suffix_array, shared_ptr<DataArray> target_data_array, - const Alignment& alignment, + shared_ptr<Alignment> alignment, const shared_ptr<Vocabulary>& vocabulary, - const Precomputation& precomputation, + shared_ptr<Precomputation> precomputation, + shared_ptr<Scorer> scorer, int min_gap_size, int max_rule_span, int max_nonterminals, int max_rule_symbols, - bool use_baeza_yates) : - matchings_finder(source_suffix_array), - intersector(vocabulary, precomputation, source_suffix_array, - make_shared<MatchingComparator>(min_gap_size, max_rule_span), - use_baeza_yates), - phrase_builder(vocabulary), - rule_extractor(source_suffix_array, target_data_array, alignment), + int max_samples, + bool use_baeza_yates, + bool require_tight_phrases) : vocabulary(vocabulary), + scorer(scorer), min_gap_size(min_gap_size), max_rule_span(max_rule_span), max_nonterminals(max_nonterminals), max_chunks(max_nonterminals + 1), - max_rule_symbols(max_rule_symbols) {} + max_rule_symbols(max_rule_symbols) { + matchings_finder = make_shared<MatchingsFinder>(source_suffix_array); + shared_ptr<MatchingComparator> comparator = + make_shared<MatchingComparator>(min_gap_size, max_rule_span); + intersector = make_shared<Intersector>(vocabulary, precomputation, + source_suffix_array, comparator, use_baeza_yates); + phrase_builder = make_shared<PhraseBuilder>(vocabulary); + rule_extractor = make_shared<RuleExtractor>(source_suffix_array->GetData(), + target_data_array, alignment, phrase_builder, scorer, vocabulary, + max_rule_span, min_gap_size, max_nonterminals, max_rule_symbols, true, + false, require_tight_phrases); + sampler = make_shared<Sampler>(source_suffix_array, max_samples); +} + -void HieroCachingRuleFactory::GetGrammar(const vector<int>& word_ids) { +Grammar HieroCachingRuleFactory::GetGrammar(const vector<int>& word_ids) { // Clear cache for every new sentence. trie.Reset(); shared_ptr<TrieNode> root = trie.GetRoot(); @@ -69,6 +87,7 @@ void HieroCachingRuleFactory::GetGrammar(const vector<int>& word_ids) { vector<int>(1, i), x_root, true)); } + vector<Rule> rules; while (!states.empty()) { State state = states.front(); states.pop(); @@ -77,7 +96,7 @@ void HieroCachingRuleFactory::GetGrammar(const vector<int>& word_ids) { vector<int> phrase = state.phrase; int word_id = word_ids[state.end]; phrase.push_back(word_id); - Phrase next_phrase = phrase_builder.Build(phrase); + Phrase next_phrase = phrase_builder->Build(phrase); shared_ptr<TrieNode> next_node; if (CannotHaveMatchings(node, word_id)) { @@ -98,14 +117,14 @@ void HieroCachingRuleFactory::GetGrammar(const vector<int>& word_ids) { } else { PhraseLocation phrase_location; if (next_phrase.Arity() > 0) { - phrase_location = intersector.Intersect( + phrase_location = intersector->Intersect( node->phrase, node->matchings, next_suffix_link->phrase, next_suffix_link->matchings, next_phrase); } else { - phrase_location = matchings_finder.Find( + phrase_location = matchings_finder->Find( node->matchings, vocabulary->GetTerminalValue(word_id), state.phrase.size()); @@ -125,7 +144,10 @@ void HieroCachingRuleFactory::GetGrammar(const vector<int>& word_ids) { state.starts_with_x); if (!state.starts_with_x) { - rule_extractor.ExtractRules(); + PhraseLocation sample = sampler->Sample(next_node->matchings); + vector<Rule> new_rules = + rule_extractor->ExtractRules(next_phrase, sample); + rules.insert(rules.end(), new_rules.begin(), new_rules.end()); } } else { next_node = node->GetChild(word_id); @@ -137,6 +159,8 @@ void HieroCachingRuleFactory::GetGrammar(const vector<int>& word_ids) { states.push(new_state); } } + + return Grammar(rules, scorer->GetFeatureNames()); } bool HieroCachingRuleFactory::CannotHaveMatchings( @@ -165,7 +189,7 @@ void HieroCachingRuleFactory::AddTrailingNonterminal( int var_id = vocabulary->GetNonterminalIndex(prefix.Arity() + 1); symbols.push_back(var_id); - Phrase var_phrase = phrase_builder.Build(symbols); + Phrase var_phrase = phrase_builder->Build(symbols); int suffix_var_id = vocabulary->GetNonterminalIndex( prefix.Arity() + starts_with_x == 0); diff --git a/extractor/rule_factory.h b/extractor/rule_factory.h index 8fe8bf30..a47b6d16 100644 --- a/extractor/rule_factory.h +++ b/extractor/rule_factory.h @@ -4,17 +4,21 @@ #include <memory> #include <vector> -#include "matchings_finder.h" -#include "intersector.h" #include "matchings_trie.h" #include "phrase_builder.h" -#include "rule_extractor.h" using namespace std; class Alignment; class DataArray; +class Grammar; +class MatchingsFinder; +class Intersector; class Precomputation; +class Rule; +class RuleExtractor; +class Sampler; +class Scorer; class State; class SuffixArray; class Vocabulary; @@ -24,16 +28,19 @@ class HieroCachingRuleFactory { HieroCachingRuleFactory( shared_ptr<SuffixArray> source_suffix_array, shared_ptr<DataArray> target_data_array, - const Alignment& alignment, + shared_ptr<Alignment> alignment, const shared_ptr<Vocabulary>& vocabulary, - const Precomputation& precomputation, + shared_ptr<Precomputation> precomputation, + shared_ptr<Scorer> scorer, int min_gap_size, int max_rule_span, int max_nonterminals, int max_rule_symbols, - bool use_beaza_yates); + int max_samples, + bool use_beaza_yates, + bool require_tight_phrases); - void GetGrammar(const vector<int>& word_ids); + Grammar GetGrammar(const vector<int>& word_ids); private: bool CannotHaveMatchings(shared_ptr<TrieNode> node, int word_id); @@ -51,12 +58,14 @@ class HieroCachingRuleFactory { const Phrase& phrase, const shared_ptr<TrieNode>& node); - MatchingsFinder matchings_finder; - Intersector intersector; + shared_ptr<MatchingsFinder> matchings_finder; + shared_ptr<Intersector> intersector; MatchingsTrie trie; - PhraseBuilder phrase_builder; - RuleExtractor rule_extractor; + shared_ptr<PhraseBuilder> phrase_builder; + shared_ptr<RuleExtractor> rule_extractor; shared_ptr<Vocabulary> vocabulary; + shared_ptr<Sampler> sampler; + shared_ptr<Scorer> scorer; int min_gap_size; int max_rule_span; int max_nonterminals; diff --git a/extractor/run_extractor.cc b/extractor/run_extractor.cc index 4f841864..37a9cba0 100644 --- a/extractor/run_extractor.cc +++ b/extractor/run_extractor.cc @@ -1,16 +1,31 @@ +#include <fstream> #include <iostream> #include <string> +#include <vector> +#include <boost/filesystem.hpp> #include <boost/program_options.hpp> #include <boost/program_options/variables_map.hpp> #include "alignment.h" #include "data_array.h" +#include "features/count_source_target.h" +#include "features/feature.h" +#include "features/is_source_singleton.h" +#include "features/is_source_target_singleton.h" +#include "features/max_lex_source_given_target.h" +#include "features/max_lex_target_given_source.h" +#include "features/sample_source_count.h" +#include "features/target_given_source_coherent.h" +#include "grammar.h" #include "grammar_extractor.h" #include "precomputation.h" +#include "rule.h" +#include "scorer.h" #include "suffix_array.h" #include "translation_table.h" +namespace fs = boost::filesystem; namespace po = boost::program_options; using namespace std; @@ -23,21 +38,26 @@ int main(int argc, char** argv) { ("target,e", po::value<string>(), "Target language corpus") ("bitext,b", po::value<string>(), "Parallel text (source ||| target)") ("alignment,a", po::value<string>()->required(), "Bitext word alignment") + ("grammars,g", po::value<string>()->required(), "Grammars output path") ("frequent", po::value<int>()->default_value(100), "Number of precomputed frequent patterns") ("super_frequent", po::value<int>()->default_value(10), "Number of precomputed super frequent patterns") - ("max_rule_span,s", po::value<int>()->default_value(15), + ("max_rule_span", po::value<int>()->default_value(15), "Maximum rule span") ("max_rule_symbols,l", po::value<int>()->default_value(5), "Maximum number of symbols (terminals + nontermals) in a rule") - ("min_gap_size,g", po::value<int>()->default_value(1), "Minimum gap size") - ("max_phrase_len,p", po::value<int>()->default_value(4), + ("min_gap_size", po::value<int>()->default_value(1), "Minimum gap size") + ("max_phrase_len", po::value<int>()->default_value(4), "Maximum frequent phrase length") ("max_nonterminals", po::value<int>()->default_value(2), "Maximum number of nonterminals in a rule") ("min_frequency", po::value<int>()->default_value(1000), "Minimum number of occurences for a pharse to be considered frequent") + ("max_samples", po::value<int>()->default_value(300), + "Maximum number of samples") + ("tight_phrases", po::value<bool>()->default_value(true), + "False if phrases may be loose (better, but slower)") ("baeza_yates", po::value<bool>()->default_value(true), "Use double binary search"); @@ -74,9 +94,10 @@ int main(int argc, char** argv) { make_shared<SuffixArray>(source_data_array); - Alignment alignment(vm["alignment"].as<string>()); + shared_ptr<Alignment> alignment = + make_shared<Alignment>(vm["alignment"].as<string>()); - Precomputation precomputation( + shared_ptr<Precomputation> precomputation = make_shared<Precomputation>( source_suffix_array, vm["frequent"].as<int>(), vm["super_frequent"].as<int>(), @@ -86,7 +107,19 @@ int main(int argc, char** argv) { vm["max_phrase_len"].as<int>(), vm["min_frequency"].as<int>()); - TranslationTable table(source_data_array, target_data_array, alignment); + shared_ptr<TranslationTable> table = make_shared<TranslationTable>( + source_data_array, target_data_array, alignment); + + vector<shared_ptr<Feature> > features = { + make_shared<TargetGivenSourceCoherent>(), + make_shared<SampleSourceCount>(), + make_shared<CountSourceTarget>(), + make_shared<MaxLexTargetGivenSource>(table), + make_shared<MaxLexSourceGivenTarget>(table), + make_shared<IsSourceSingleton>(), + make_shared<IsSourceTargetSingleton>() + }; + shared_ptr<Scorer> scorer = make_shared<Scorer>(features); // TODO(pauldb): Add parallelization. GrammarExtractor extractor( @@ -94,15 +127,34 @@ int main(int argc, char** argv) { target_data_array, alignment, precomputation, + scorer, vm["min_gap_size"].as<int>(), vm["max_rule_span"].as<int>(), vm["max_nonterminals"].as<int>(), vm["max_rule_symbols"].as<int>(), - vm["baeza_yates"].as<bool>()); + vm["max_samples"].as<int>(), + vm["baeza_yates"].as<bool>(), + vm["tight_phrases"].as<bool>()); - string sentence; + int grammar_id = 0; + fs::path grammar_path = vm["grammars"].as<string>(); + string sentence, delimiter = "|||"; while (getline(cin, sentence)) { - extractor.GetGrammar(sentence); + string suffix = ""; + int position = sentence.find(delimiter); + if (position != sentence.npos) { + suffix = sentence.substr(position); + sentence = sentence.substr(0, position); + } + + Grammar grammar = extractor.GetGrammar(sentence); + fs::path grammar_file = grammar_path / to_string(grammar_id); + ofstream output(grammar_file.c_str()); + output << grammar; + + cout << "<seg grammar=\"" << grammar_file << "\" id=\"" << grammar_id + << "\"> " << sentence << " </seg> " << suffix << endl; + ++grammar_id; } return 0; diff --git a/extractor/sampler.cc b/extractor/sampler.cc new file mode 100644 index 00000000..d8e0f49e --- /dev/null +++ b/extractor/sampler.cc @@ -0,0 +1,36 @@ +#include "sampler.h" + +#include "phrase_location.h" +#include "suffix_array.h" + +Sampler::Sampler(shared_ptr<SuffixArray> suffix_array, int max_samples) : + suffix_array(suffix_array), max_samples(max_samples) {} + +PhraseLocation Sampler::Sample(const PhraseLocation& location) const { + vector<int> sample; + int num_subpatterns; + if (location.matchings == NULL) { + num_subpatterns = 1; + int low = location.sa_low, high = location.sa_high; + double step = max(1.0, (double) (high - low) / max_samples); + for (double i = low; i < high && sample.size() < max_samples; i += step) { + sample.push_back(suffix_array->GetSuffix(Round(i))); + } + } else { + num_subpatterns = location.num_subpatterns; + int num_matchings = location.matchings->size() / num_subpatterns; + double step = max(1.0, (double) num_matchings / max_samples); + for (double i = 0, num_samples = 0; + i < num_matchings && num_samples < max_samples; + i += step, ++num_samples) { + int start = Round(i) * num_subpatterns; + sample.insert(sample.end(), location.matchings->begin() + start, + location.matchings->begin() + start + num_subpatterns); + } + } + return PhraseLocation(sample, num_subpatterns); +} + +int Sampler::Round(double x) const { + return x + 0.5; +} diff --git a/extractor/sampler.h b/extractor/sampler.h new file mode 100644 index 00000000..3b3e3a4d --- /dev/null +++ b/extractor/sampler.h @@ -0,0 +1,24 @@ +#ifndef _SAMPLER_H_ +#define _SAMPLER_H_ + +#include <memory> + +using namespace std; + +class PhraseLocation; +class SuffixArray; + +class Sampler { + public: + Sampler(shared_ptr<SuffixArray> suffix_array, int max_samples); + + PhraseLocation Sample(const PhraseLocation& location) const; + + private: + int Round(double x) const; + + shared_ptr<SuffixArray> suffix_array; + int max_samples; +}; + +#endif diff --git a/extractor/sampler_test.cc b/extractor/sampler_test.cc new file mode 100644 index 00000000..4f91965b --- /dev/null +++ b/extractor/sampler_test.cc @@ -0,0 +1,72 @@ +#include <gtest/gtest.h> + +#include <memory> + +#include "mocks/mock_suffix_array.h" +#include "phrase_location.h" +#include "sampler.h" + +using namespace std; +using namespace ::testing; + +namespace { + +class SamplerTest : public Test { + protected: + virtual void SetUp() { + suffix_array = make_shared<MockSuffixArray>(); + for (int i = 0; i < 10; ++i) { + EXPECT_CALL(*suffix_array, GetSuffix(i)).WillRepeatedly(Return(i)); + } + } + + shared_ptr<MockSuffixArray> suffix_array; + shared_ptr<Sampler> sampler; +}; + +TEST_F(SamplerTest, TestSuffixArrayRange) { + PhraseLocation location(0, 10); + + sampler = make_shared<Sampler>(suffix_array, 1); + vector<int> expected_locations = {0}; + EXPECT_EQ(PhraseLocation(expected_locations, 1), sampler->Sample(location)); + + sampler = make_shared<Sampler>(suffix_array, 2); + expected_locations = {0, 5}; + EXPECT_EQ(PhraseLocation(expected_locations, 1), sampler->Sample(location)); + + sampler = make_shared<Sampler>(suffix_array, 3); + expected_locations = {0, 3, 7}; + EXPECT_EQ(PhraseLocation(expected_locations, 1), sampler->Sample(location)); + + sampler = make_shared<Sampler>(suffix_array, 4); + expected_locations = {0, 3, 5, 8}; + EXPECT_EQ(PhraseLocation(expected_locations, 1), sampler->Sample(location)); + + sampler = make_shared<Sampler>(suffix_array, 100); + expected_locations = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}; + EXPECT_EQ(PhraseLocation(expected_locations, 1), sampler->Sample(location)); +} + +TEST_F(SamplerTest, TestSubstringsSample) { + vector<int> locations = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}; + PhraseLocation location(locations, 2); + + sampler = make_shared<Sampler>(suffix_array, 1); + vector<int> expected_locations = {0, 1}; + EXPECT_EQ(PhraseLocation(expected_locations, 2), sampler->Sample(location)); + + sampler = make_shared<Sampler>(suffix_array, 2); + expected_locations = {0, 1, 6, 7}; + EXPECT_EQ(PhraseLocation(expected_locations, 2), sampler->Sample(location)); + + sampler = make_shared<Sampler>(suffix_array, 3); + expected_locations = {0, 1, 4, 5, 6, 7}; + EXPECT_EQ(PhraseLocation(expected_locations, 2), sampler->Sample(location)); + + sampler = make_shared<Sampler>(suffix_array, 7); + expected_locations = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}; + EXPECT_EQ(PhraseLocation(expected_locations, 2), sampler->Sample(location)); +} + +} // namespace diff --git a/extractor/scorer.cc b/extractor/scorer.cc index 22d5be1a..c87e179d 100644 --- a/extractor/scorer.cc +++ b/extractor/scorer.cc @@ -1,9 +1,22 @@ #include "scorer.h" -Scorer::Scorer(const vector<Feature*>& features) : features(features) {} +#include "features/feature.h" -Scorer::~Scorer() { - for (Feature* feature: features) { - delete feature; +Scorer::Scorer(const vector<shared_ptr<Feature> >& features) : + features(features) {} + +vector<double> Scorer::Score(const FeatureContext& context) const { + vector<double> scores; + for (auto feature: features) { + scores.push_back(feature->Score(context)); + } + return scores; +} + +vector<string> Scorer::GetFeatureNames() const { + vector<string> feature_names; + for (auto feature: features) { + feature_names.push_back(feature->GetName()); } + return feature_names; } diff --git a/extractor/scorer.h b/extractor/scorer.h index 57405a6c..5b328fb4 100644 --- a/extractor/scorer.h +++ b/extractor/scorer.h @@ -1,19 +1,25 @@ #ifndef _SCORER_H_ #define _SCORER_H_ +#include <memory> +#include <string> #include <vector> -#include "features/feature.h" - using namespace std; +class Feature; +class FeatureContext; + class Scorer { public: - Scorer(const vector<Feature*>& features); - ~Scorer(); + Scorer(const vector<shared_ptr<Feature> >& features); + + vector<double> Score(const FeatureContext& context) const; + + vector<string> GetFeatureNames() const; private: - vector<Feature*> features; + vector<shared_ptr<Feature> > features; }; #endif diff --git a/extractor/suffix_array.cc b/extractor/suffix_array.cc index 76f00ace..d13eacd5 100644 --- a/extractor/suffix_array.cc +++ b/extractor/suffix_array.cc @@ -15,6 +15,8 @@ SuffixArray::SuffixArray(shared_ptr<DataArray> data_array) : BuildSuffixArray(); } +SuffixArray::SuffixArray() {} + SuffixArray::~SuffixArray() {} void SuffixArray::BuildSuffixArray() { diff --git a/extractor/suffix_array.h b/extractor/suffix_array.h index 7708f5a2..79a22694 100644 --- a/extractor/suffix_array.h +++ b/extractor/suffix_array.h @@ -21,17 +21,20 @@ class SuffixArray { virtual int GetSize() const; - shared_ptr<DataArray> GetData() const; + virtual shared_ptr<DataArray> GetData() const; - vector<int> BuildLCPArray() const; + virtual vector<int> BuildLCPArray() const; - int GetSuffix(int rank) const; + virtual int GetSuffix(int rank) const; virtual PhraseLocation Lookup(int low, int high, const string& word, int offset) const; void WriteBinary(const fs::path& filepath) const; + protected: + SuffixArray(); + private: void BuildSuffixArray(); diff --git a/extractor/translation_table.cc b/extractor/translation_table.cc index 5eb4ffdc..10f1b9ed 100644 --- a/extractor/translation_table.cc +++ b/extractor/translation_table.cc @@ -13,17 +13,17 @@ using namespace tr1; TranslationTable::TranslationTable(shared_ptr<DataArray> source_data_array, shared_ptr<DataArray> target_data_array, - const Alignment& alignment) : + shared_ptr<Alignment> alignment) : source_data_array(source_data_array), target_data_array(target_data_array) { const vector<int>& source_data = source_data_array->GetData(); const vector<int>& target_data = target_data_array->GetData(); unordered_map<int, int> source_links_count; unordered_map<int, int> target_links_count; - unordered_map<pair<int, int>, int, boost::hash<pair<int, int> > > links_count; + unordered_map<pair<int, int>, int, PairHash > links_count; for (size_t i = 0; i < source_data_array->GetNumSentences(); ++i) { - vector<pair<int, int> > links = alignment.GetLinks(i); + const vector<pair<int, int> >& links = alignment->GetLinks(i); int source_start = source_data_array->GetSentenceStart(i); int next_source_start = source_data_array->GetSentenceStart(i + 1); int target_start = target_data_array->GetSentenceStart(i); @@ -58,7 +58,7 @@ TranslationTable::TranslationTable(shared_ptr<DataArray> source_data_array, } } -double TranslationTable::GetEgivenFScore( +double TranslationTable::GetTargetGivenSourceScore( const string& source_word, const string& target_word) { if (!source_data_array->HasWord(source_word) || !target_data_array->HasWord(target_word)) { @@ -70,7 +70,7 @@ double TranslationTable::GetEgivenFScore( return translation_probabilities[make_pair(source_id, target_id)].first; } -double TranslationTable::GetFgivenEScore( +double TranslationTable::GetSourceGivenTargetScore( const string& source_word, const string& target_word) { if (!source_data_array->HasWord(source_word) || !target_data_array->HasWord(target_word) == 0) { diff --git a/extractor/translation_table.h b/extractor/translation_table.h index 6004eca0..acf94af7 100644 --- a/extractor/translation_table.h +++ b/extractor/translation_table.h @@ -15,24 +15,28 @@ namespace fs = boost::filesystem; class Alignment; class DataArray; +typedef boost::hash<pair<int, int> > PairHash; + class TranslationTable { public: TranslationTable( shared_ptr<DataArray> source_data_array, shared_ptr<DataArray> target_data_array, - const Alignment& alignment); + shared_ptr<Alignment> alignment); - double GetEgivenFScore(const string& source_word, const string& target_word); + double GetTargetGivenSourceScore(const string& source_word, + const string& target_word); - double GetFgivenEScore(const string& source_word, const string& target_word); + double GetSourceGivenTargetScore(const string& source_word, + const string& target_word); void WriteBinary(const fs::path& filepath) const; private: - shared_ptr<DataArray> source_data_array; - shared_ptr<DataArray> target_data_array; - unordered_map<pair<int, int>, pair<double, double>, - boost::hash<pair<int, int> > > translation_probabilities; + shared_ptr<DataArray> source_data_array; + shared_ptr<DataArray> target_data_array; + unordered_map<pair<int, int>, pair<double, double>, PairHash> + translation_probabilities; }; #endif diff --git a/extractor/vocabulary.h b/extractor/vocabulary.h index 05744269..ed55e5e4 100644 --- a/extractor/vocabulary.h +++ b/extractor/vocabulary.h @@ -12,7 +12,7 @@ class Vocabulary { public: virtual ~Vocabulary(); - int GetTerminalIndex(const string& word); + virtual int GetTerminalIndex(const string& word); int GetNonterminalIndex(int position); |