Package org.apache.solr.search.similarities

Class BM25SimilarityFactory

java.lang.Object

org.apache.solr.schema.SimilarityFactory

org.apache.solr.search.similarities.BM25SimilarityFactory

public class BM25SimilarityFactory
extends SimilarityFactory

Factory for BM25Similarity. This is the default similarity since 8.x.

Parameters:

• k1 (float): Controls non-linear term frequency normalization (saturation). The default is 1.2
• b (float): Controls to what degree document length normalizes tf values. The default is 0.75
• discountOverlaps (bool): True if overlap tokens (tokens with a position of increment of zero) are discounted from the document's length. The default is true

Since:

8.0.0

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
BM25SimilarityFactory()

Method Summary

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

BM25SimilarityFactory

public BM25SimilarityFactory()

Method Detail

init

public void init(SolrParams params)

Overrides:

init in class SimilarityFactory

getSimilarity

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

Specified by:

getSimilarity in class SimilarityFactory