Esempio n. 1
0
  public PairSimilarity() {
    // the signature comparison measure used during similarity-based disambiguation
    try {
      String p =
          "it.uniroma1.lcl.adw.comparison."
              + ADWConfiguration.getInstance().getAlignmentSimilarityMeasure();

      @SuppressWarnings("unchecked")
      Constructor<SignatureComparison> ct =
          (Constructor<SignatureComparison>) Class.forName(p).getConstructor(new Class[] {});
      alignmentMeasure = ct.newInstance();
    } catch (Exception e) {
      e.printStackTrace();
    }

    // the size of the semantic signatures used during similarity-based disambiguation
    alignmentVecSize = ADWConfiguration.getInstance().getAlignmentVectorSize();
    // the size of the semantic signatures used during the main comparison
    testedVectorSize = ADWConfiguration.getInstance().getTestVectorSize();
  }
Esempio n. 2
0
public class PairSimilarity {
  private SignatureComparison alignmentMeasure;
  private int alignmentVecSize;
  private int testedVectorSize;
  private static boolean discardStopwords =
      ADWConfiguration.getInstance().getDiscardStopwordsCondition();
  private static boolean mirrorPOStagging =
      ADWConfiguration.getInstance().getMirrorPOSTaggingCondition();

  private static PairSimilarity instance;

  public PairSimilarity() {
    // the signature comparison measure used during similarity-based disambiguation
    try {
      String p =
          "it.uniroma1.lcl.adw.comparison."
              + ADWConfiguration.getInstance().getAlignmentSimilarityMeasure();

      @SuppressWarnings("unchecked")
      Constructor<SignatureComparison> ct =
          (Constructor<SignatureComparison>) Class.forName(p).getConstructor(new Class[] {});
      alignmentMeasure = ct.newInstance();
    } catch (Exception e) {
      e.printStackTrace();
    }

    // the size of the semantic signatures used during similarity-based disambiguation
    alignmentVecSize = ADWConfiguration.getInstance().getAlignmentVectorSize();
    // the size of the semantic signatures used during the main comparison
    testedVectorSize = ADWConfiguration.getInstance().getTestVectorSize();
  }

  /**
   * Used to access {@link ADW}
   *
   * @return an instance of {@link ADW}
   */
  public static PairSimilarity getInstance() {
    try {
      if (instance == null) instance = new PairSimilarity();
      return instance;
    } catch (Exception e) {
      throw new RuntimeException("Could not init TSPipeline: " + e.getMessage());
    }
  }

  public Pair<List<String>, List<String>> cookLexicalItem(
      String text, ItemType textType, boolean discardStopwords) {
    try {

      List<String> cookedSentence = new ArrayList<String>();
      Pair<List<String>, List<String>> out = new Pair<List<String>, List<String>>(null, null);

      for (String item : Arrays.asList(text.split(" "))) {
        if (item.trim().length() == 0) continue;

        switch (textType) {
          case SENSE_OFFSETS:
            cookedSentence.add(item);
            break;

          case SENSE_KEYS:
            IWord sense = WordNetUtils.getInstance().getSenseFromSenseKey(item);
            cookedSentence.add(
                GeneralUtils.fixOffset(sense.getSynset().getOffset(), sense.getPOS()));
            break;

          case WORD_SENSE:
            IWord snse = WordNetUtils.getInstance().mapWordSenseToIWord(item);
            cookedSentence.add(GeneralUtils.fixOffset(snse.getSynset().getOffset(), snse.getPOS()));
            break;

          case SURFACE_TAGGED:
            cookedSentence.add(item);
            break;
        }
      }

      if (textType.equals(ItemType.SURFACE)) {
        out = TextualSimilarity.getInstance().cookSentence(text);
        cookedSentence = out.first;
      }

      if (cookedSentence == null) cookedSentence = new ArrayList<String>();

      List<String> newCS = new ArrayList<String>();

      for (String s : cookedSentence) {
        // if it is a synset
        if (s.matches("[0-9]*\\-[anvr]")) {
          newCS.add(s);
          continue;
        }

        String comps[] = s.split("#");
        String word = comps[0];
        String ps = comps[1];

        // otherwise check word exists in WordNet
        if (!TextualSimilarity.getInstance().isOOV(word, ps)) newCS.add(word + "#" + ps);
      }

      cookedSentence = newCS;

      return new Pair<List<String>, List<String>>(cookedSentence, out.second);
    } catch (Exception e) {
      e.printStackTrace();
    }

    return null;
  }

  private Set<SemSig> convertToSet(List<List<SemSig>> vs) {
    Set<SemSig> vectors = new HashSet<SemSig>();

    for (List<SemSig> aList : vs) for (SemSig a : aList) vectors.add(a);

    return vectors;
  }

  public Pair<List<SemSig>, List<SemSig>> DisambiguateCookedSentence(
      List<String> cookedSentence1,
      List<String> cookedSentence2,
      ItemType srcTextType,
      ItemType trgTextType,
      LKB lkb,
      SignatureComparison measure,
      int vectorSize,
      boolean restrictedByPOS,
      boolean verbose) {

    try {

      LinkedHashMap<Pair<SemSig, SemSig>, Double> alignments;
      LinkedHashMap<Pair<SemSig, SemSig>, Double> alignmentsRev;

      List<List<SemSig>> firstVectors =
          convertToVectors(cookedSentence1, srcTextType, lkb, vectorSize);
      Set<SemSig> firstVectorSet = convertToSet(firstVectors);

      List<List<SemSig>> secondVectors =
          convertToVectors(cookedSentence2, trgTextType, lkb, vectorSize);
      Set<SemSig> secondVectorSet = convertToSet(secondVectors);

      alignments =
          TextualSimilarity.getInstance()
              .alignmentBasedDisambiguation(
                  firstVectors,
                  secondVectorSet,
                  alignmentMeasure,
                  alignmentVecSize,
                  new HashSet<SemSig>());

      // of there is any alignment with 1.0 score, make sure that the target is selected on the
      // reverse disambiguation
      Set<SemSig> toBeTakens = new HashSet<SemSig>();
      for (Pair<SemSig, SemSig> sig : alignments.keySet())
        if (Math.abs(alignments.get(sig) - 1) < 0.0001) toBeTakens.add(sig.second);

      alignmentsRev =
          TextualSimilarity.getInstance()
              .alignmentBasedDisambiguation(
                  secondVectors, firstVectorSet, alignmentMeasure, alignmentVecSize, toBeTakens);

      List<SemSig> srcSigs = new ArrayList<SemSig>();
      List<SemSig> trgSigs = new ArrayList<SemSig>();

      for (Pair<SemSig, SemSig> sig : alignments.keySet()) srcSigs.add(sig.first);

      for (Pair<SemSig, SemSig> sig : alignmentsRev.keySet()) trgSigs.add(sig.first);

      if (alignmentVecSize != testedVectorSize) {
        srcSigs = getTestVectors(srcSigs);
        trgSigs = getTestVectors(trgSigs);
      }

      return new Pair<List<SemSig>, List<SemSig>>(srcSigs, trgSigs);

    } catch (Exception e) {
      e.printStackTrace();
    }

    return null;
  }

  private List<SemSig> getTestVectors(List<SemSig> alignmentVectors) {
    List<SemSig> testSigs = new ArrayList<SemSig>();

    for (SemSig sig : alignmentVectors) {
      testSigs.add(
          SemSigProcess.getInstance()
              .getSemSigFromOffset(sig.getOffset(), LKB.WordNetGloss, testedVectorSize));
    }

    return testSigs;
  }

  public ItemType guessLexicalItemType(String input) {
    String firstWord = input.split(" ")[0];

    if (firstWord.matches("[0-9]*\\-[anvr]")) return ItemType.SENSE_OFFSETS;

    if (firstWord.matches("[^ ]*%[0-9]*:[^ ]*")) return ItemType.SENSE_KEYS;

    if (WordNetUtils.getInstance().mapWordSenseToIWord(firstWord) != null)
      return ItemType.WORD_SENSE;

    if (firstWord.matches("[^ ]*#[nvra]")) return ItemType.SURFACE_TAGGED;

    return ItemType.SURFACE;
  }

  public Pair<List<String>, List<String>> mirrorPosTags(
      List<String> firstCookedSentence, List<String> secondCookedSentence) {
    /*
    if(secondCookedSentence.size() == 0)
    {
    	System.out.println("[ERROR: Set mirror pos tagging off!]");
    	System.exit(0);
    }
    */

    return TextualSimilarity.fixPOSmirroring(firstCookedSentence, secondCookedSentence);
  }

  public double getSimilarity(
      String text1,
      String text2,
      DisambiguationMethod disMethod,
      SignatureComparison measure,
      ItemType srcTextType,
      ItemType trgTextType) {

    // pre-process sentence pair
    List<String> cookedSentence1 = cookLexicalItem(text1, srcTextType, discardStopwords).first;
    List<String> cookedSentence2 = cookLexicalItem(text2, trgTextType, discardStopwords).first;

    // Mirror pos tagging
    if (mirrorPOStagging && srcTextType.equals(ItemType.SURFACE)
        || trgTextType.equals(ItemType.SURFACE)) {
      Pair<List<String>, List<String>> aPair = mirrorPosTags(cookedSentence1, cookedSentence2);

      cookedSentence1 = aPair.first;
      cookedSentence2 = aPair.second;
    }

    List<SemSig> srcSemSigs = new ArrayList<SemSig>();
    List<SemSig> trgSemSigs = new ArrayList<SemSig>();

    switch (disMethod) {
      case NONE:
        // take all the synsets (or Semsigs to be consistent with others) of all the words in the
        // two sides
        srcSemSigs =
            SemSigProcess.getInstance()
                .getAllSemSigsFromWordPosList(cookedSentence1, srcTextType, testedVectorSize);
        trgSemSigs =
            SemSigProcess.getInstance()
                .getAllSemSigsFromWordPosList(cookedSentence2, trgTextType, testedVectorSize);
        break;

        // alignment-based disambiguation
        // should disambiguate the two texts and return the disambiguated SemSigs
      case ALIGNMENT_BASED:
        Pair<List<SemSig>, List<SemSig>> disambiguatedPair =
            DisambiguateCookedSentence(
                cookedSentence1,
                cookedSentence2,
                srcTextType,
                trgTextType,
                LKB.WordNetGloss,
                alignmentMeasure,
                alignmentVecSize,
                true,
                true);

        srcSemSigs = disambiguatedPair.first;
        trgSemSigs = disambiguatedPair.second;

        break;
    }

    SemSig srcSemSig =
        (srcSemSigs.size() == 1) ? srcSemSigs.get(0) : SemSigUtils.averageSemSigs(srcSemSigs);

    SemSig trgSemSig =
        (trgSemSigs.size() == 1) ? trgSemSigs.get(0) : SemSigUtils.averageSemSigs(trgSemSigs);

    return SemSigComparator.compare(
        srcSemSig.getVector(), trgSemSig.getVector(), measure, testedVectorSize, false, true);
  }

  public List<List<SemSig>> convertToVectors(
      List<String> sentence, ItemType type, LKB lkb, int vSize) {
    List<List<SemSig>> firstVectors = new ArrayList<List<SemSig>>();
    Set<SemSig> firstVectorSet = new HashSet<SemSig>();

    if (type.equals(ItemType.SENSE_OFFSETS)
        || type.equals(ItemType.SENSE_KEYS)
        || type.equals(ItemType.WORD_SENSE)) {
      firstVectorSet =
          new HashSet<SemSig>(
              TextualSimilarity.getInstance()
                  .getSenseVectorsFromOffsetSentence(sentence, type, lkb, vSize));

      for (SemSig s : firstVectorSet) firstVectors.add(Arrays.asList(s));
    } else {
      firstVectors =
          TextualSimilarity.getInstance().getSenseVectorsFromCookedSentence(sentence, lkb, vSize);
    }

    return firstVectors;
  }
}