Script for grammar extraction only.

1 files changed, 253 insertions, 0 deletions

diff --git a/extractor/extract.cc b/extractor/extract.cc
new file mode 100644
index 00000000..2d5831fa
--- /dev/null
+++ b/extractor/extract.cc
@@ -0,0 +1,253 @@
+#include <fstream>
+#include <iostream>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include <boost/archive/binary_iarchive.hpp>
+#include <boost/filesystem.hpp>
+#include <boost/program_options.hpp>
+#include <boost/program_options/variables_map.hpp>
+#include <omp.h>
+
+#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 "time_util.h"
+#include "translation_table.h"
+#include "vocabulary.h"
+
+namespace ar = boost::archive;
+namespace fs = boost::filesystem;
+namespace po = boost::program_options;
+using namespace extractor;
+using namespace features;
+using namespace std;
+
+// Returns the file path in which a given grammar should be written.
+fs::path GetGrammarFilePath(const fs::path& grammar_path, int file_number) {
+  string file_name = "grammar." + to_string(file_number);
+  return grammar_path / file_name;
+}
+
+int main(int argc, char** argv) {
+  po::options_description general_options("General options");
+  int max_threads = 1;
+  #pragma omp parallel
+  max_threads = omp_get_num_threads();
+  string threads_option = "Number of threads used for grammar extraction "
+                          "max(" + to_string(max_threads) + ")";
+  general_options.add_options()
+    ("threads,t", po::value<int>()->required()->default_value(1),
+     threads_option.c_str())
+    ("grammars,g", po::value<string>()->required(), "Grammars output path")
+    ("max_rule_span", po::value<int>()->default_value(15),
+        "Maximum rule span")
+    ("max_rule_symbols", po::value<int>()->default_value(5),
+        "Maximum number of symbols (terminals + nontermals) in a rule")
+    ("min_gap_size", po::value<int>()->default_value(1), "Minimum gap size")
+    ("max_nonterminals", po::value<int>()->default_value(2),
+        "Maximum number of nonterminals in a rule")
+    ("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)")
+    ("leave_one_out", po::value<bool>()->zero_tokens(),
+        "do leave-one-out estimation of grammars "
+        "(e.g. for extracting grammars for the training set");
+
+  po::options_description cmdline_options("Command line options");
+  cmdline_options.add_options()
+    ("help", "Show available options")
+    ("config", po::value<string>()->required(), "Path to config file");
+  cmdline_options.add(general_options);
+
+  po::options_description config_options("Config file options");
+  config_options.add_options()
+    ("target", po::value<string>()->required(),
+        "Path to target data file in binary format")
+    ("source", po::value<string>()->required(),
+        "Path to source suffix array file in binary format")
+    ("alignment", po::value<string>()->required(),
+        "Path to alignment file in binary format")
+    ("precomputation", po::value<string>()->required(),
+        "Path to precomputation file in binary format")
+    ("vocabulary", po::value<string>()->required(),
+        "Path to vocabulary file in binary format")
+    ("ttable", po::value<string>()->required(),
+        "Path to translation table in binary format");
+  config_options.add(general_options);
+
+  po::variables_map vm;
+  po::store(po::parse_command_line(argc, argv, cmdline_options), vm);
+  if (vm.count("help")) {
+    po::options_description all_options;
+    all_options.add(cmdline_options).add(config_options);
+    cout << all_options << endl;
+    return 0;
+  }
+
+  po::notify(vm);
+
+  ifstream config_stream(vm["config"].as<string>());
+  po::store(po::parse_config_file(config_stream, config_options), vm);
+  po::notify(vm);
+
+  int num_threads = vm["threads"].as<int>();
+  cerr << "Grammar extraction will use " << num_threads << " threads." << endl;
+
+  Clock::time_point read_start_time = Clock::now();
+
+  Clock::time_point start_time = Clock::now();
+  cerr << "Reading target data in binary format..." << endl;
+  shared_ptr<DataArray> target_data_array = make_shared<DataArray>();
+  ifstream target_fstream(vm["target"].as<string>());
+  ar::binary_iarchive target_stream(target_fstream);
+  target_stream >> *target_data_array;
+  Clock::time_point end_time = Clock::now();
+  cerr << "Reading target data took " << GetDuration(start_time, end_time)
+       << " seconds" << endl;
+
+  start_time = Clock::now();
+  cerr << "Reading source suffix array in binary format..." << endl;
+  shared_ptr<SuffixArray> source_suffix_array = make_shared<SuffixArray>();
+  ifstream source_fstream(vm["source"].as<string>());
+  ar::binary_iarchive source_stream(source_fstream);
+  source_stream >> *source_suffix_array;
+  end_time = Clock::now();
+  cerr << "Reading source suffix array took "
+       << GetDuration(start_time, end_time) << " seconds" << endl;
+
+  start_time = Clock::now();
+  cerr << "Reading alignment in binary format..." << endl;
+  shared_ptr<Alignment> alignment = make_shared<Alignment>();
+  ifstream alignment_fstream(vm["alignment"].as<string>());
+  ar::binary_iarchive alignment_stream(alignment_fstream);
+  alignment_stream >> *alignment;
+  end_time = Clock::now();
+  cerr << "Reading alignment took " << GetDuration(start_time, end_time)
+       << " seconds" << endl;
+
+  start_time = Clock::now();
+  cerr << "Reading precomputation in binary format..." << endl;
+  shared_ptr<Precomputation> precomputation = make_shared<Precomputation>();
+  ifstream precomputation_fstream(vm["precomputation"].as<string>());
+  ar::binary_iarchive precomputation_stream(precomputation_fstream);
+  precomputation_stream >> *precomputation;
+  end_time = Clock::now();
+  cerr << "Reading precomputation took " << GetDuration(start_time, end_time)
+       << " seconds" << endl;
+
+  start_time = Clock::now();
+  cerr << "Reading vocabulary in binary format..." << endl;
+  shared_ptr<Vocabulary> vocabulary = make_shared<Vocabulary>();
+  ifstream vocabulary_fstream(vm["vocabulary"].as<string>());
+  ar::binary_iarchive vocabulary_stream(vocabulary_fstream);
+  vocabulary_stream >> *vocabulary;
+  end_time = Clock::now();
+  cerr << "Reading vocabulary took " << GetDuration(start_time, end_time)
+       << " seconds" << endl;
+
+  start_time = Clock::now();
+  cerr << "Reading translation table in binary format..." << endl;
+  shared_ptr<TranslationTable> table = make_shared<TranslationTable>();
+  ifstream ttable_fstream(vm["ttable"].as<string>());
+  ar::binary_iarchive ttable_stream(ttable_fstream);
+  ttable_stream >> *table;
+  end_time = Clock::now();
+  cerr << "Reading translation table took " << GetDuration(start_time, end_time)
+       << " seconds" << endl;
+
+  Clock::time_point read_end_time = Clock::now();
+  cerr << "Total time spent loading data structures into memory: "
+       << GetDuration(read_start_time, read_end_time) << " seconds" << endl;
+
+  Clock::time_point extraction_start_time = Clock::now();
+  // Features used to score each grammar rule.
+  vector<shared_ptr<Feature>> features = {
+      make_shared<TargetGivenSourceCoherent>(),
+      make_shared<SampleSourceCount>(),
+      make_shared<CountSourceTarget>(),
+      make_shared<MaxLexSourceGivenTarget>(table),
+      make_shared<MaxLexTargetGivenSource>(table),
+      make_shared<IsSourceSingleton>(),
+      make_shared<IsSourceTargetSingleton>()
+  };
+  shared_ptr<Scorer> scorer = make_shared<Scorer>(features);
+
+  GrammarExtractor extractor(
+      source_suffix_array,
+      target_data_array,
+      alignment,
+      precomputation,
+      scorer,
+      vocabulary,
+      vm["min_gap_size"].as<int>(),
+      vm["max_rule_span"].as<int>(),
+      vm["max_nonterminals"].as<int>(),
+      vm["max_rule_symbols"].as<int>(),
+      vm["max_samples"].as<int>(),
+      vm["tight_phrases"].as<bool>());
+
+  // Creates the grammars directory if it doesn't exist.
+  fs::path grammar_path = vm["grammars"].as<string>();
+  if (!fs::is_directory(grammar_path)) {
+    fs::create_directory(grammar_path);
+  }
+
+  // Reads all sentences for which we extract grammar rules (the paralellization
+  // is simplified if we read all sentences upfront).
+  string sentence;
+  vector<string> sentences;
+  while (getline(cin, sentence)) {
+    sentences.push_back(sentence);
+  }
+
+  // Extracts the grammar for each sentence and saves it to a file.
+  vector<string> suffixes(sentences.size());
+  bool leave_one_out = vm.count("leave_one_out");
+  #pragma omp parallel for schedule(dynamic) num_threads(num_threads)
+  for (size_t i = 0; i < sentences.size(); ++i) {
+    string suffix;
+    int position = sentences[i].find("|||");
+    if (position != sentences[i].npos) {
+      suffix = sentences[i].substr(position);
+      sentences[i] = sentences[i].substr(0, position);
+    }
+    suffixes[i] = suffix;
+
+    unordered_set<int> blacklisted_sentence_ids;
+    if (leave_one_out) {
+      blacklisted_sentence_ids.insert(i);
+    }
+    Grammar grammar = extractor.GetGrammar(
+        sentences[i], blacklisted_sentence_ids);
+    ofstream output(GetGrammarFilePath(grammar_path, i).c_str());
+    // output << grammar;
+  }
+
+  for (size_t i = 0; i < sentences.size(); ++i) {
+    cout << "<seg grammar=" << GetGrammarFilePath(grammar_path, i) << " id=\""
+         << i << "\"> " << sentences[i] << " </seg> " << suffixes[i] << endl;
+  }
+
+  Clock::time_point extraction_stop_time = Clock::now();
+  cerr << "Overall extraction step took "
+       << GetDuration(extraction_start_time, extraction_stop_time)
+       << " seconds" << endl;
+
+  return 0;
+}