org.apache.lucene.search

Class DefaultSimilarity

public class DefaultSimilarity extends Similarity

Expert: Default scoring implementation.

Method Summary
float	coord(int overlap, int maxOverlap) Implemented as `overlap / maxOverlap`.
float	idf(int docFreq, int numDocs) Implemented as `log(numDocs/(docFreq+1)) + 1`.
float	lengthNorm(String fieldName, int numTerms) Implemented as `1/sqrt(numTerms)`.
float	queryNorm(float sumOfSquaredWeights) Implemented as `1/sqrt(sumOfSquaredWeights)`.
float	sloppyFreq(int distance) Implemented as `1 / (distance + 1)`.
float	tf(float freq) Implemented as `sqrt(freq)`.

Method Detail

public float coord(int overlap, int maxOverlap)

Implemented as overlap / maxOverlap.

public float idf(int docFreq, int numDocs)

Implemented as log(numDocs/(docFreq+1)) + 1.

public float lengthNorm(String fieldName, int numTerms)

Implemented as 1/sqrt(numTerms).

public float queryNorm(float sumOfSquaredWeights)

Implemented as 1/sqrt(sumOfSquaredWeights).

public float sloppyFreq(int distance)

Implemented as 1 / (distance + 1).

public float tf(float freq)

Implemented as sqrt(freq).