List of tf() Examples

Examples of tf()

org.apache.lucene.search.DefaultSimilarity.tf()
Implemented as sqrt(freq).
org.apache.lucene.search.Similarity.tf()
Computes a score factor based on a term or phrase's frequency in a document. This value is multiplied by the {@link #idf(int,int)}factor for each term in the query and these products are then summed to form the initial score for a document.
Terms and phrases repeated in a document indicate the topic of the document, so implementations of this method usually return larger values when freq is large, and smaller values when freq is small.
The default implementation calls {@link #tf(float)}. @param freq the frequency of a term within a document @return a score factor based on a term's within-document frequency
org.apache.lucene.search.similarities.DefaultSimilarity.tf()
Implemented as sqrt(freq).
org.apache.lucene.search.similarities.TFIDFSimilarity.tf()
Computes a score factor based on a term or phrase's frequency in a document. This value is multiplied by the {@link #idf(long,long)}factor for each term in the query and these products are then summed to form the initial score for a document.
Terms and phrases repeated in a document indicate the topic of the document, so implementations of this method usually return larger values when freq is large, and smaller values when freq is small.
The default implementation calls {@link #tf(float)}. @param freq the frequency of a term within a document @return a score factor based on a term's within-document frequency
org.elasticsearch.search.lookup.IndexFieldTerm.tf()

Examples of org.apache.lucene.search.Similarity.tf()

      assertEquals("tf flat2: i="+i, 2.0f, s.tf(i), 0.0f);
    }
    for (int i = 6; i <=1000; i++) {
      assertTrue("tf: i="+i+" : s="+s.tf(i)+
                 " < d="+d.tf(i),
                 s.tf(i) < d.tf(i));
    }


    // stupidity
    assertEquals("tf zero", 0.0f, s.tf(0), 0.0f);
  }

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Examples of org.apache.lucene.search.Similarity.tf()

                 " < d="+d.tf(i),
                 s.tf(i) < d.tf(i));
    }


    // stupidity
    assertEquals("tf zero", 0.0f, s.tf(0), 0.0f);
  }


  public void testHyperbolicSweetSpot() {
  
    SweetSpotSimilarity ss = new SweetSpotSimilarity() {

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Examples of org.apache.lucene.search.Similarity.tf()

    ss.setHyperbolicTfFactors(3.3f, 7.7f, Math.E, 5.0f);
    
    Similarity s = ss;


    for (int i = 1; i <=1000; i++) {
      assertTrue("MIN tf: i="+i+" : s="+s.tf(i),
                 3.3f <= s.tf(i));
      assertTrue("MAX tf: i="+i+" : s="+s.tf(i),
                 s.tf(i) <= 7.7f);
    }
    assertEquals("MID tf", 3.3f+(7.7f - 3.3f)/2.0f, s.tf(5), 0.00001f);

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Examples of org.apache.lucene.search.Similarity.tf()

    
    Similarity s = ss;


    for (int i = 1; i <=1000; i++) {
      assertTrue("MIN tf: i="+i+" : s="+s.tf(i),
                 3.3f <= s.tf(i));
      assertTrue("MAX tf: i="+i+" : s="+s.tf(i),
                 s.tf(i) <= 7.7f);
    }
    assertEquals("MID tf", 3.3f+(7.7f - 3.3f)/2.0f, s.tf(5), 0.00001f);

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Examples of org.apache.lucene.search.Similarity.tf()

    Similarity s = ss;


    for (int i = 1; i <=1000; i++) {
      assertTrue("MIN tf: i="+i+" : s="+s.tf(i),
                 3.3f <= s.tf(i));
      assertTrue("MAX tf: i="+i+" : s="+s.tf(i),
                 s.tf(i) <= 7.7f);
    }
    assertEquals("MID tf", 3.3f+(7.7f - 3.3f)/2.0f, s.tf(5), 0.00001f);
    
    // stupidity

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Examples of org.apache.lucene.search.Similarity.tf()


    for (int i = 1; i <=1000; i++) {
      assertTrue("MIN tf: i="+i+" : s="+s.tf(i),
                 3.3f <= s.tf(i));
      assertTrue("MAX tf: i="+i+" : s="+s.tf(i),
                 s.tf(i) <= 7.7f);
    }
    assertEquals("MID tf", 3.3f+(7.7f - 3.3f)/2.0f, s.tf(5), 0.00001f);
    
    // stupidity
    assertEquals("tf zero", 0.0f, s.tf(0), 0.0f);

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Examples of org.apache.lucene.search.Similarity.tf()

      assertTrue("MIN tf: i="+i+" : s="+s.tf(i),
                 3.3f <= s.tf(i));
      assertTrue("MAX tf: i="+i+" : s="+s.tf(i),
                 s.tf(i) <= 7.7f);
    }
    assertEquals("MID tf", 3.3f+(7.7f - 3.3f)/2.0f, s.tf(5), 0.00001f);
    
    // stupidity
    assertEquals("tf zero", 0.0f, s.tf(0), 0.0f);
    
  }

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Examples of org.apache.lucene.search.Similarity.tf()

                 s.tf(i) <= 7.7f);
    }
    assertEquals("MID tf", 3.3f+(7.7f - 3.3f)/2.0f, s.tf(5), 0.00001f);
    
    // stupidity
    assertEquals("tf zero", 0.0f, s.tf(0), 0.0f);
    
  }


  
}

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Examples of org.apache.lucene.search.similarities.DefaultSimilarity.tf()

     * Ensures output is either 1 (for all inputs > 0), or 0.
     */
    @Test
    public void testTF() {
        DefaultSimilarity sim = new BinarySimilarity();
        assertEquals("big positive number", 1, (int)Math.round(sim.tf(999)));
        assertEquals("slightly more than 1", 1, (int)Math.round(sim.tf(2)));
        assertEquals("just 1", 1, (int)Math.round(sim.tf(1)));
        assertEquals("slightly less than 1", 0, (int)Math.round(sim.tf(0)));
        assertEquals("big negative number", 0, (int)Math.round(sim.tf(-999)));
    }

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Examples of org.apache.lucene.search.similarities.DefaultSimilarity.tf()

     */
    @Test
    public void testTF() {
        DefaultSimilarity sim = new BinarySimilarity();
        assertEquals("big positive number", 1, (int)Math.round(sim.tf(999)));
        assertEquals("slightly more than 1", 1, (int)Math.round(sim.tf(2)));
        assertEquals("just 1", 1, (int)Math.round(sim.tf(1)));
        assertEquals("slightly less than 1", 0, (int)Math.round(sim.tf(0)));
        assertEquals("big negative number", 0, (int)Math.round(sim.tf(-999)));
    }

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