Class QueryRescorer

A Rescorer that uses a provided Query to assign scores to the first-pass hits.

This is a Lucene.NET EXPERIMENTAL API, use at your own risk
Inheritance
System.Object
Rescorer
QueryRescorer
Namespace: Lucene.Net.Search
Assembly: Lucene.Net.dll
Syntax
public abstract class QueryRescorer : Rescorer

Constructors

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QueryRescorer(Query)

Sole constructor, passing the 2nd pass query to assign scores to the 1st pass hits.

Declaration
public QueryRescorer(Query query)
Parameters
Type Name Description
Query query

Methods

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Combine(Single, Boolean, Single)

Implement this in a subclass to combine the first pass and second pass scores. If secondPassMatches is false then the second pass query failed to match a hit from the first pass query, and you should ignore the secondPassScore.

Declaration
protected abstract float Combine(float firstPassScore, bool secondPassMatches, float secondPassScore)
Parameters
Type Name Description
System.Single firstPassScore
System.Boolean secondPassMatches
System.Single secondPassScore
Returns
Type Description
System.Single
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Explain(IndexSearcher, Explanation, Int32)

Declaration
public override Explanation Explain(IndexSearcher searcher, Explanation firstPassExplanation, int docID)
Parameters
Type Name Description
IndexSearcher searcher
Explanation firstPassExplanation
System.Int32 docID
Returns
Type Description
Explanation
Overrides
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Rescore(IndexSearcher, TopDocs, Query, Double, Int32)

Sugar API, calling Rescore(IndexSearcher, TopDocs, Int32) using a simple linear combination of firstPassScore + weight * secondPassScore

Declaration
public static TopDocs Rescore(IndexSearcher searcher, TopDocs topDocs, Query query, double weight, int topN)
Parameters
Type Name Description
IndexSearcher searcher
TopDocs topDocs
Query query
System.Double weight
System.Int32 topN
Returns
Type Description
TopDocs
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Rescore(IndexSearcher, TopDocs, Int32)

Declaration
public override TopDocs Rescore(IndexSearcher searcher, TopDocs firstPassTopDocs, int topN)
Parameters
Type Name Description
IndexSearcher searcher
TopDocs firstPassTopDocs
System.Int32 topN
Returns
Type Description
TopDocs
Overrides