summaryrefslogtreecommitdiff
path: root/extractor/run_extractor.cc
blob: d73f77cd15e5e274ac8b13832522d308f65d8ba3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
#include <chrono>
#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 "time_util.h"
#include "translation_table.h"

namespace fs = boost::filesystem;
namespace po = boost::program_options;
using namespace std;

int main(int argc, char** argv) {
  // TODO(pauldb): Also take arguments from config file.
  po::options_description desc("Command line options");
  desc.add_options()
    ("help,h", "Show available options")
    ("source,f", po::value<string>(), "Source language corpus")
    ("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", 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", 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")
    // TODO(pauldb): Check if this works when set to false.
    ("tight_phrases", po::value<bool>()->default_value(true),
        "False if phrases may be loose (better, but slower)");

  po::variables_map vm;
  po::store(po::parse_command_line(argc, argv, desc), vm);

  // Check for help argument before notify, so we don't need to pass in the
  // required parameters.
  if (vm.count("help")) {
    cout << desc << endl;
    return 0;
  }

  po::notify(vm);

  if (!((vm.count("source") && vm.count("target")) || vm.count("bitext"))) {
    cerr << "A paralel corpus is required. "
         << "Use -f (source) with -e (target) or -b (bitext)."
         << endl;
    return 1;
  }

  Clock::time_point preprocess_start_time = Clock::now();
  cerr << "Reading source and target data..." << endl;
  Clock::time_point start_time = Clock::now();
  shared_ptr<DataArray> source_data_array, target_data_array;
  if (vm.count("bitext")) {
    source_data_array = make_shared<DataArray>(
        vm["bitext"].as<string>(), SOURCE);
    target_data_array = make_shared<DataArray>(
        vm["bitext"].as<string>(), TARGET);
  } else {
    source_data_array = make_shared<DataArray>(vm["source"].as<string>());
    target_data_array = make_shared<DataArray>(vm["target"].as<string>());
  }
  Clock::time_point stop_time = Clock::now();
  cerr << "Reading data took " << GetDuration(start_time, stop_time)
       << " seconds" << endl;

  cerr << "Creating source suffix array..." << endl;
  start_time = Clock::now();
  shared_ptr<SuffixArray> source_suffix_array =
      make_shared<SuffixArray>(source_data_array);
  stop_time = Clock::now();
  cerr << "Creating suffix array took "
       << GetDuration(start_time, stop_time) << " seconds" << endl;

  cerr << "Reading alignment..." << endl;
  start_time = Clock::now();
  shared_ptr<Alignment> alignment =
      make_shared<Alignment>(vm["alignment"].as<string>());
  stop_time = Clock::now();
  cerr << "Reading alignment took "
       << GetDuration(start_time, stop_time) << " seconds" << endl;

  cerr << "Precomputating collocations..." << endl;
  start_time = Clock::now();
  shared_ptr<Precomputation> precomputation = make_shared<Precomputation>(
      source_suffix_array,
      vm["frequent"].as<int>(),
      vm["super_frequent"].as<int>(),
      vm["max_rule_span"].as<int>(),
      vm["max_rule_symbols"].as<int>(),
      vm["min_gap_size"].as<int>(),
      vm["max_phrase_len"].as<int>(),
      vm["min_frequency"].as<int>());
  stop_time = Clock::now();
  cerr << "Precomputing collocations took "
       << GetDuration(start_time, stop_time) << " seconds" << endl;

  cerr << "Precomputing conditional probabilities..." << endl;
  start_time = Clock::now();
  shared_ptr<TranslationTable> table = make_shared<TranslationTable>(
      source_data_array, target_data_array, alignment);
  stop_time = Clock::now();
  cerr << "Precomputing conditional probabilities took "
       << GetDuration(start_time, stop_time) << " seconds" << endl;

  Clock::time_point preprocess_stop_time = Clock::now();
  cerr << "Overall preprocessing step took "
       << GetDuration(preprocess_start_time, preprocess_stop_time)
       << " seconds" << endl;

  Clock::time_point extraction_start_time = Clock::now();
  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);

  // TODO(pauldb): Add parallelization.
  GrammarExtractor extractor(
      source_suffix_array,
      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["max_samples"].as<int>(),
      vm["tight_phrases"].as<bool>());

  int grammar_id = 0;
  fs::path grammar_path = vm["grammars"].as<string>();
  if (!fs::is_directory(grammar_path)) {
    fs::create_directory(grammar_path);
  }

  string sentence, delimiter = "|||";
  while (getline(cin, 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);
    string file_name = "grammar." + to_string(grammar_id);
    fs::path grammar_file = grammar_path / file_name;
    ofstream output(grammar_file.c_str());
    output << grammar;

    cout << "<seg grammar=\"" << grammar_file << "\" id=\"" << grammar_id
         << "\"> " << sentence << " </seg> " << suffix << endl;
    ++grammar_id;
  }
  Clock::time_point extraction_stop_time = Clock::now();
  cerr << "Overall extraction step took "
       << GetDuration(extraction_start_time, extraction_stop_time)
       << " seconds" << endl;

  return 0;
}