Java Code Examples for org.apache.lucene.search.similarities.LMJelinekMercerSimilarity

The following examples show how to use org.apache.lucene.search.similarities.LMJelinekMercerSimilarity. These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
/** jelinek-mercer with parameters */
public void testParameters() throws Exception {
  Similarity sim = getSimilarity("text_params");
  assertEquals(LMJelinekMercerSimilarity.class, sim.getClass());
  LMJelinekMercerSimilarity lm = (LMJelinekMercerSimilarity) sim;
  assertEquals(0.4f, lm.getLambda(), 0.01f);
}
 
Example 2
@Before
public void setupIndex() throws IOException {
    dirUnderTest = newDirectory();
    List<Similarity> sims = Arrays.asList(
            new ClassicSimilarity(),
            new SweetSpotSimilarity(), // extends Classic
            new BM25Similarity(),
            new LMDirichletSimilarity(),
            new BooleanSimilarity(),
            new LMJelinekMercerSimilarity(0.2F),
            new AxiomaticF3LOG(0.5F, 10),
            new DFISimilarity(new IndependenceChiSquared()),
            new DFRSimilarity(new BasicModelG(), new AfterEffectB(), new NormalizationH1()),
            new IBSimilarity(new DistributionLL(), new LambdaDF(), new NormalizationH3())
        );
    similarity = sims.get(random().nextInt(sims.size()));

    indexWriterUnderTest = new RandomIndexWriter(random(), dirUnderTest, newIndexWriterConfig().setSimilarity(similarity));
    for (int i = 0; i < docs.length; i++) {
        Document doc = new Document();
        doc.add(newStringField("id", "" + i, Field.Store.YES));
        doc.add(newField("field", docs[i], Store.YES));
        indexWriterUnderTest.addDocument(doc);
    }
    indexWriterUnderTest.commit();
    indexWriterUnderTest.forceMerge(1);
    indexWriterUnderTest.flush();


    indexReaderUnderTest = indexWriterUnderTest.getReader();
    searcherUnderTest = newSearcher(indexReaderUnderTest);
    searcherUnderTest.setSimilarity(similarity);
}
 
Example 3
@Inject
public LMJelinekMercerSimilarityProvider(@Assisted String name, @Assisted Settings settings) {
    super(name);
    float lambda = settings.getAsFloat("lambda", 0.1f);
    this.similarity = new LMJelinekMercerSimilarity(lambda);
}
 
Example 4
@Override
public Similarity getSimilarity() {
  LMJelinekMercerSimilarity sim = new LMJelinekMercerSimilarity(lambda);
  sim.setDiscountOverlaps(discountOverlaps);
  return sim;
}
 
Example 5
/** jelinek-mercer with default parameters */
public void test() throws Exception {
  assertEquals(LMJelinekMercerSimilarity.class, getSimilarity("text").getClass());
}