Example #1
0
  public static Map<String, List<LinkedHashMap<String, Object>>> similarDocumentMapForClass(
      GraphDatabaseService db, String className) {

    Map<String, List<LinkedHashMap<String, Object>>> documents;
    Map<String, List<LinkedHashMap<String, Object>>> results = new HashMap<>();
    List<Integer> featureIndexList;

    VsmCacheModel vsmCacheModel = new VsmCacheModel(db).invoke();
    featureIndexList = vsmCacheModel.getFeatureIndexList();
    documents = vsmCacheModel.getDocuments();

    final String key = className;

    List<LinkedHashMap<String, Object>> resultList = new ArrayList<>();
    LinkedHashMap<String, Double> classMap = new LinkedHashMap<>();

    List<Double> v1 = getFeatureVectorForDocumentClass(documents, featureIndexList, key);

    documents
        .keySet()
        .stream()
        .filter(otherKey -> !key.equals(otherKey))
        .forEach(
            otherKey -> {
              List<Double> v2 =
                  getBinaryFeatureVectorForDocumentClass(documents, featureIndexList, otherKey);
              classMap.put(otherKey, cosineSimilarity(v1, v2));
            });

    classMap
        .keySet()
        .forEach(
            ks -> {
              if (!ks.equals(key) && classMap.get(ks) > 0.0) {
                LinkedHashMap<String, Object> localMap = new LinkedHashMap<>();
                localMap.put("class", ks);
                localMap.put("similarity", classMap.get(ks));
                resultList.add(localMap);
              }
            });

    resultList.sort(
        (a, b) -> {
          Double diff = (((double) a.get("similarity")) - ((double) b.get("similarity")));
          return diff > 0 ? -1 : diff.equals(0.0) ? 0 : 1;
        });

    results.put("classes", resultList);

    return results;
  }
Example #2
0
  public static Map<String, List<LinkedHashMap<String, Object>>> similarDocumentMapForVector(
      GraphDatabaseService db, GraphManager graphManager, String input) {
    Map<String, List<LinkedHashMap<String, Object>>> documents;
    Map<String, List<LinkedHashMap<String, Object>>> results = new HashMap<>();
    List<Integer> featureIndexList;

    VsmCacheModel vsmCacheModel = new VsmCacheModel(db).invoke();
    featureIndexList = vsmCacheModel.getFeatureIndexList();
    documents = vsmCacheModel.getDocuments();

    List<Double> features = getFeatureVector(db, graphManager, input, featureIndexList);

    List<LinkedHashMap<String, Object>> resultList = new ArrayList<>();
    LinkedHashMap<String, Double> classMap = new LinkedHashMap<>();

    documents
        .keySet()
        .stream()
        .forEach(
            otherKey -> {
              List<Double> v2 = getWeightVectorForClass(documents, otherKey, featureIndexList, db);
              classMap.put(otherKey, cosineSimilarity(v2, features));
            });

    classMap
        .keySet()
        .stream()
        .forEach(
            ks -> {
              if (classMap.get(ks) > 0.0) {
                LinkedHashMap<String, Object> localMap = new LinkedHashMap<>();
                localMap.put("class", ks);
                localMap.put("similarity", classMap.get(ks));
                resultList.add(localMap);
              }
            });

    try {
      resultList.sort(
          (a, b) -> {
            Double diff = (((double) a.get("similarity")) - ((double) b.get("similarity")));
            return diff > 0 ? -1 : diff.equals(0.0) ? 0 : 1;
          });
    } catch (NullPointerException ex) {
      // resultList is empty or null
    }

    results.put("classes", resultList);

    return results;
  }