public abstract static class Similarity.SimWeight extends Object
Similarity
should
subclass SimWeight
and define the statistics they require in the
subclass. Examples include idf, average field length, etc.Constructor and Description |
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SimWeight()
Sole constructor.
|
Modifier and Type | Method and Description |
---|---|
abstract float |
getValueForNormalization()
The value for normalization of contained query clauses (e.g.
|
abstract void |
normalize(float queryNorm,
float boost)
Assigns the query normalization factor and boost from parent queries to this.
|
public SimWeight()
public abstract float getValueForNormalization()
NOTE: a Similarity implementation might not use any query normalization at all, it's not required. However, if it wants to participate in query normalization, it can return a value here.
public abstract void normalize(float queryNorm, float boost)
NOTE: a Similarity implementation might not use this normalized value at all, it's not required. However, it's usually a good idea to at least incorporate the boost into its score.
NOTE: If this method is called several times, it behaves as if only the last call was performed.
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