List of queryNorm() Examples

Examples of queryNorm()

org.apache.lucene.search.Similarity.queryNorm()
Computes the normalization value for a query given the sum of the squared weights of each of the query terms. This value is multiplied into the weight of each query term. While the classic query normalization factor is computed as 1/sqrt(sumOfSquaredWeights), other implementations might completely ignore sumOfSquaredWeights (ie return 1).
This does not affect ranking, but the default implementation does make scores from different queries more comparable than they would be by eliminating the magnitude of the Query vector as a factor in the score. @param sumOfSquaredWeights the sum of the squares of query term weights @return a normalization factor for query weights
org.apache.lucene.search.similarities.Similarity.queryNorm()
Computes the normalization value for a query given the sum of the normalized weights {@link SimWeight#getValueForNormalization()} of each of the query terms. This value is passed back to the weight ( {@link SimWeight#normalize(float,float)} of each query term, to provide a hook to attempt to make scores from different queries comparable.
By default this is disabled (returns 1), but some implementations such as {@link TFIDFSimilarity} override this. @param valueForNormalization the sum of the term normalization values @return a normalization factor for query weights

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


        return new DefaultSimilarity() {


          @Override
          public float queryNorm(final float sumOfSquaredWeights) {
            return base.queryNorm(sumOfSquaredWeights);
          }




          @Override
          public float coord(final int overlap, final int max) {

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Examples of org.apache.lucene.search.similarities.Similarity.queryNorm()

        return base.coord(overlap, maxOverlap);
      }


      @Override
      public float queryNorm(float sumOfSquaredWeights) {
        return base.queryNorm(sumOfSquaredWeights);
      }
    });
    
    // in this case, we searched on field "foo". first document should have 2x the score.
    TermQuery tq = new TermQuery(new Term("foo", "quick"));

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Examples of org.apache.lucene.search.similarities.Similarity.queryNorm()

        return base.coord(overlap, maxOverlap);
      }


      @Override
      public float queryNorm(float sumOfSquaredWeights) {
        return base.queryNorm(sumOfSquaredWeights);
      }
    });
    
    // in this case, we searched on field "foo". first document should have 2x the score.
    TermQuery tq = new TermQuery(new Term("foo", "quick"));

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