Example usage for org.apache.lucene.misc SweetSpotSimilarity tf

Introduction

In this page you can find the example usage for org.apache.lucene.misc SweetSpotSimilarity tf.

Prototype

@Override
public float tf(float freq) 

Source Link

Document

Delegates to baselineTf

Usage

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

License:Apache License

/** default parameters */
public void testDefaults() throws Exception {
    SweetSpotSimilarity sim = getSimilarity("text", SweetSpotSimilarity.class);

    // SSS tf w/defaults should behave just like DS
    DefaultSimilarity d = new DefaultSimilarity();
    for (int i = 0; i <= 1000; i++) {
        assertEquals("tf: i=" + i, d.tf(i), sim.tf(i), 0.0F);
    }/* w  ww  .j a  va  2s  .c  o m*/

    // default norm sanity check
    assertEquals("norm 1", 1.00F, sim.computeLengthNorm(1), 0.0F);
    assertEquals("norm 4", 0.50F, sim.computeLengthNorm(4), 0.0F);
    assertEquals("norm 16", 0.25F, sim.computeLengthNorm(16), 0.0F);
}

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

License:Apache License

/** baseline with parameters */
public void testBaselineParameters() throws Exception {
    SweetSpotSimilarity sim = getSimilarity("text_baseline", SweetSpotSimilarity.class);

    DefaultSimilarity d = new DefaultSimilarity();

    // constant up to 6
    for (int i = 1; i <= 6; i++) {
        assertEquals("tf i=" + i, 1.5F, sim.tf(i), 0.0F);
    }//from ww  w  . ja  v  a 2 s . c o  m
    // less then default sim above 6
    for (int i = 6; i <= 1000; i++) {
        assertTrue("tf: i=" + i + " : s=" + sim.tf(i) + " < d=" + d.tf(i), sim.tf(i) < d.tf(i));
    }

    // norms: plateau from 3-5
    assertEquals("norm 1 == 7", sim.computeLengthNorm(1), sim.computeLengthNorm(7), 0.0F);
    assertEquals("norm 2 == 6", sim.computeLengthNorm(1), sim.computeLengthNorm(7), 0.0F);
    assertEquals("norm 3", 1.00F, sim.computeLengthNorm(3), 0.0F);
    assertEquals("norm 4", 1.00F, sim.computeLengthNorm(4), 0.0F);
    assertEquals("norm 5", 1.00F, sim.computeLengthNorm(5), 0.0F);
    assertTrue("norm 6 too high: " + sim.computeLengthNorm(6), sim.computeLengthNorm(6) < 1.0F);
    assertTrue("norm 7 higher then norm 6", sim.computeLengthNorm(7) < sim.computeLengthNorm(6));
    assertEquals("norm 20", 0.25F, sim.computeLengthNorm(20), 0.0F);
}

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

License:Apache License

/** hyperbolic with parameters */
public void testHyperbolicParameters() throws Exception {
    SweetSpotSimilarity sim = getSimilarity("text_hyperbolic", SweetSpotSimilarity.class);

    for (int i = 1; i <= 1000; i++) {
        assertTrue("MIN tf: i=" + i + " : s=" + sim.tf(i), 3.3F <= sim.tf(i));
        assertTrue("MAX tf: i=" + i + " : s=" + sim.tf(i), sim.tf(i) <= 7.7F);
    }/*from  ww w .j ava 2s  .  com*/
    assertEquals("MID tf", 3.3F + (7.7F - 3.3F) / 2.0F, sim.tf(5), 0.00001F);

    // norms: plateau from 1-5, shallow slope
    assertEquals("norm 1", 1.00F, sim.computeLengthNorm(1), 0.0F);
    assertEquals("norm 2", 1.00F, sim.computeLengthNorm(2), 0.0F);
    assertEquals("norm 3", 1.00F, sim.computeLengthNorm(3), 0.0F);
    assertEquals("norm 4", 1.00F, sim.computeLengthNorm(4), 0.0F);
    assertEquals("norm 5", 1.00F, sim.computeLengthNorm(5), 0.0F);
    assertTrue("norm 6 too high: " + sim.computeLengthNorm(6), sim.computeLengthNorm(6) < 1.0F);
    assertTrue("norm 7 higher then norm 6", sim.computeLengthNorm(7) < sim.computeLengthNorm(6));
    assertTrue("norm 20 not high enough: " + sim.computeLengthNorm(20), 0.25F < sim.computeLengthNorm(20));
}

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