Class Rescorer

Re-scores the topN results (TopDocs) from an original query. See QueryRescorer for an actual implementation. Typically, you run a low-cost first-pass query across the entire index, collecting the top few hundred hits perhaps, and then use this class to mix in a more costly second pass scoring.

See Rescore(IndexSearcher, TopDocs, Query, Double, Int32) for a simple static method to call to rescore using a 2nd pass Query.

This is a Lucene.NET EXPERIMENTAL API, use at your own risk

Inheritance

System.Object

Rescorer

QueryRescorer

SortRescorer

Namespace: Lucene.Net.Search

Assembly: Lucene.Net.dll

Syntax

public abstract class Rescorer : object

Methods

Explain(IndexSearcher, Explanation, Int32)

Explains how the score for the specified document was computed.

Declaration

public abstract Explanation Explain(IndexSearcher searcher, Explanation firstPassExplanation, int docID)

Parameters

Type	Name	Description
IndexSearcher	searcher
Explanation	firstPassExplanation
System.Int32	docID

Returns

Type	Description
Explanation

Rescore(IndexSearcher, TopDocs, Int32)

Rescore an initial first-pass TopDocs.

Declaration

public abstract TopDocs Rescore(IndexSearcher searcher, TopDocs firstPassTopDocs, int topN)

Parameters

Type	Name	Description
IndexSearcher	searcher	IndexSearcher used to produce the first pass topDocs
TopDocs	firstPassTopDocs	Hits from the first pass search. It's very important that these hits were produced by the provided searcher; otherwise the doc IDs will not match!
System.Int32	topN	How many re-scored hits to return

Returns

Type	Description
TopDocs