Example usage for org.apache.lucene.search.similarities BM25Similarity getK1

Introduction

In this page you can find the example usage for org.apache.lucene.search.similarities BM25Similarity getK1.

Prototype

public final float getK1() 

Source Link

Document

Returns the k1 parameter

Usage

From source file:org.apache.solr.search.similarities.TestBM25SimilarityFactory.java

License:Apache License

/** bm25 with parameters */
public void testParameters() throws Exception {
    Similarity sim = getSimilarity("text_params");
    assertEquals(BM25Similarity.class, sim.getClass());
    BM25Similarity bm25 = (BM25Similarity) sim;
    assertEquals(1.2f, bm25.getK1(), 0.01f);
    assertEquals(0.76f, bm25.getB(), 0.01f);
}

---

From source file:org.elasticsearch.index.similarity.SimilarityTests.java

License:Apache License

@Test
public void testResolveSimilaritiesFromMapping_bm25() throws IOException {
    String mapping = XContentFactory.jsonBuilder().startObject().startObject("type").startObject("properties")
            .startObject("field1").field("type", "string").field("similarity", "my_similarity").endObject()
            .endObject().endObject().endObject().string();

    Settings indexSettings = ImmutableSettings.settingsBuilder()
            .put("index.similarity.my_similarity.type", "BM25").put("index.similarity.my_similarity.k1", 2.0f)
            .put("index.similarity.my_similarity.b", 1.5f)
            .put("index.similarity.my_similarity.discount_overlaps", false).build();
    SimilarityService similarityService = similarityService(indexSettings);
    DocumentMapper documentMapper = similarityService.mapperService().documentMapperParser().parse(mapping);
    assertThat(documentMapper.mappers().name("field1").mapper().similarity(),
            instanceOf(BM25SimilarityProvider.class));

    BM25Similarity similarity = (BM25Similarity) documentMapper.mappers().name("field1").mapper().similarity()
            .get();//from ww  w.ja va 2 s .  co  m
    assertThat(similarity.getK1(), equalTo(2.0f));
    assertThat(similarity.getB(), equalTo(1.5f));
    assertThat(similarity.getDiscountOverlaps(), equalTo(false));
}

---