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

Package org.apache.lucene.search.similarities

Class org.apache.lucene.search.similarities.TFIDFSimilarity

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

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

    TFIDFSimilarity 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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    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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      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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                 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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          }


          if (atDoc > doc) {
            // term doesn't match this document... either because we hit the
            // end, or because the next doc is after this doc.
            return similarity.tf(0);
          }


          // a match!
          return similarity.tf(docs.freq());
        } catch (IOException e) {

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            // end, or because the next doc is after this doc.
            return similarity.tf(0);
          }


          // a match!
          return similarity.tf(docs.freq());
        } catch (IOException e) {
          throw new RuntimeException("caught exception in function "+description()+" : doc="+doc, e);
        }
      }
    };

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