Package org.apache.solr.search.similarities

Class IBSimilarityFactory

java.lang.Object

org.apache.solr.schema.SimilarityFactory

org.apache.solr.search.similarities.IBSimilarityFactory

public class IBSimilarityFactory
extends SimilarityFactory

Factory for IBSimilarity

You must specify the implementations for all three components of the Information-Based model (strings).

1. distribution: Probabilistic distribution used to model term occurrence
   • LL: Log-logistic
   • SPL: Smoothed power-law
2. lambda: λ_w parameter of the probability distribution
   • DF: Nw/N or average number of documents where w occurs
   • TTF: Fw/N or average number of occurrences of w in the collection
3. normalization: Term frequency normalization

   Any supported DFR normalization listed in DFRSimilarityFactory

Optional settings:

• discountOverlaps (bool): Sets SimilarityBase.setDiscountOverlaps(boolean)

WARNING: This API is experimental and might change in incompatible ways in the next release.

Field Summary

Fields inherited from class org.apache.solr.schema.SimilarityFactory

CLASS_NAME, params

Constructor Summary

Constructors

Constructor	Description
IBSimilarityFactory()

Method Summary

Modifier and Type	Method	Description
org.apache.lucene.search.similarities.Similarity	getSimilarity()
void	init(org.apache.solr.common.params.SolrParams params)

Methods inherited from class org.apache.solr.schema.SimilarityFactory

getClassArg, getNamedPropertyValues, getParams

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IBSimilarityFactory

public IBSimilarityFactory()

Method Detail

init

public void init(org.apache.solr.common.params.SolrParams params)

Overrides:

init in class SimilarityFactory

getSimilarity

public org.apache.lucene.search.similarities.Similarity getSimilarity()

Specified by:

getSimilarity in class SimilarityFactory