Esempio n. 1
0
  private void explore(LineReader grammar) {
    int counter = 0;
    boolean first_line = true;
    while (grammar.hasNext()) {
      String line = grammar.next().trim();
      counter++;

      String[] fields = line.split("\\s\\|{3}\\s");
      if (fields.length < 4) {
        logger.warning("Incomplete grammar line at line " + counter);
        continue;
      }

      String lhs = fields[0];
      String[] source = fields[1].split("\\s");
      String[] target = fields[2].split("\\s");
      String[] features = fields[3].split("\\s");

      Vocabulary.id(lhs);
      // Add symbols to vocabulary.
      for (String source_word : source) {
        if (FormatUtils.isNonterminal(source_word)) Vocabulary.id(FormatUtils.stripNt(source_word));
        else Vocabulary.id(source_word);
      }
      for (String target_word : target) {
        if (FormatUtils.isNonterminal(target_word)) Vocabulary.id(FormatUtils.stripNt(target_word));
        else Vocabulary.id(target_word);
      }

      // Test features for labeling.
      if (first_line && features.length != 0) {
        if (!features[0].contains("=")) {
          // We assume that if there is one unlabeled feature the entire grammar is unlabeled.
          labeled = false;
        }
        this.types.setLabeled(labeled);
        first_line = false;
      }

      // Add feature names to vocabulary and pass the value through the
      // appropriate encoder.
      for (int f = 0; f < features.length; ++f) {
        if (labeled) {
          String[] fe = features[f].split("=");
          if (fe[0].equals("Alignment")) continue;
          types.observe(Vocabulary.id(fe[0]), Float.parseFloat(fe[1]));
        } else {
          types.observe(f, Float.parseFloat(features[f]));
        }
      }
    }
  }
Esempio n. 2
0
  private void binarize(
      LineReader grammar_reader, LineReader alignment_reader, Queue<PackingFileTuple> slices)
      throws IOException {
    int counter = 0;
    int slice_counter = 0;
    int num_slices = 0;

    boolean ready_to_flush = false;
    String first_source_word = null;

    PackingTrie<SourceValue> source_trie = new PackingTrie<SourceValue>();
    PackingTrie<TargetValue> target_trie = new PackingTrie<TargetValue>();
    FeatureBuffer feature_buffer = new FeatureBuffer();

    AlignmentBuffer alignment_buffer = null;
    if (packAlignments) alignment_buffer = new AlignmentBuffer();

    TreeMap<Integer, Float> features = new TreeMap<Integer, Float>();
    while (grammar_reader.hasNext()) {
      String grammar_line = grammar_reader.next().trim();
      counter++;
      slice_counter++;

      String[] fields = grammar_line.split("\\s\\|{3}\\s");
      if (fields.length < 4) {
        logger.warning("Incomplete grammar line at line " + counter);
        continue;
      }
      String lhs_word = fields[0];
      String[] source_words = fields[1].split("\\s");
      String[] target_words = fields[2].split("\\s");
      String[] feature_entries = fields[3].split("\\s");

      // Reached slice limit size, indicate that we're closing up.
      if (!ready_to_flush
          && (slice_counter > SLICE_SIZE
              || feature_buffer.overflowing()
              || (packAlignments && alignment_buffer.overflowing()))) {
        ready_to_flush = true;
        first_source_word = source_words[0];
      }
      // Finished closing up.
      if (ready_to_flush && !first_source_word.equals(source_words[0])) {
        slices.add(flush(source_trie, target_trie, feature_buffer, alignment_buffer, num_slices));
        source_trie.clear();
        target_trie.clear();
        feature_buffer.clear();
        if (packAlignments) alignment_buffer.clear();

        num_slices++;
        slice_counter = 0;
        ready_to_flush = false;
      }

      int alignment_index = -1;
      // If present, process alignments.
      if (packAlignments) {
        if (!alignment_reader.hasNext()) {
          logger.severe("No more alignments starting in line " + counter);
          throw new RuntimeException("No more alignments starting in line " + counter);
        } else {
          String alignment_line = alignment_reader.next().trim();
          String[] alignment_entries = alignment_line.split("\\s");
          byte[] alignments = new byte[alignment_entries.length * 2];
          if (alignment_entries.length != 0) {
            for (int i = 0; i < alignment_entries.length; i++) {
              String[] parts = alignment_entries[i].split("-");
              alignments[2 * i] = Byte.parseByte(parts[0]);
              alignments[2 * i + 1] = Byte.parseByte(parts[1]);
            }
          }
          alignment_index = alignment_buffer.add(alignments);
        }
      }

      // Process features.
      // Implicitly sort via TreeMap, write to data buffer, remember position
      // to pass on to the source trie node.
      features.clear();
      for (int f = 0; f < feature_entries.length; ++f) {
        String feature_entry = feature_entries[f];
        if (this.labeled) {
          String[] parts = feature_entry.split("=");
          if (parts[0].equals("Alignment")) continue;
          int feature_id = Vocabulary.id(parts[0]);
          float feature_value = Float.parseFloat(parts[1]);
          if (feature_value != 0) features.put(encoderConfig.innerId(feature_id), feature_value);
        } else {
          float feature_value = Float.parseFloat(feature_entry);
          if (feature_value != 0) features.put(f, feature_value);
        }
      }
      int features_index = feature_buffer.add(features);

      // Sanity check on the data block index.
      if (packAlignments && features_index != alignment_index) {
        logger.severe(
            "Block index mismatch between features ("
                + features_index
                + ") and alignments ("
                + alignment_index
                + ").");
        throw new RuntimeException("Data block index mismatch.");
      }

      // Process source side.
      SourceValue sv = new SourceValue(Vocabulary.id(lhs_word), features_index);
      int[] source = new int[source_words.length];
      for (int i = 0; i < source_words.length; i++) {
        if (FormatUtils.isNonterminal(source_words[i]))
          source[i] = Vocabulary.id(FormatUtils.stripNt(source_words[i]));
        else source[i] = Vocabulary.id(source_words[i]);
      }
      source_trie.add(source, sv);

      // Process target side.
      TargetValue tv = new TargetValue(sv);
      int[] target = new int[target_words.length];
      for (int i = 0; i < target_words.length; i++) {
        if (FormatUtils.isNonterminal(target_words[i])) {
          target[target_words.length - (i + 1)] = -FormatUtils.getNonterminalIndex(target_words[i]);
        } else {
          target[target_words.length - (i + 1)] = Vocabulary.id(target_words[i]);
        }
      }
      target_trie.add(target, tv);
    }
    slices.add(flush(source_trie, target_trie, feature_buffer, alignment_buffer, num_slices));
  }