Class QualityStats

Results of quality benchmark run for a single query or for a set of queries.

Inheritance
System.Object
QualityStats
Namespace: Lucene.Net.Benchmarks.Quality
Assembly: Lucene.Net.Benchmark.dll
Syntax
public class QualityStats : object

Constructors

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QualityStats(Double, Int64)

Construct a QualityStats object with anticipated maximal number of relevant hits.

Declaration
public QualityStats(double maxGoodPoints, long searchTime)
Parameters
Type Name Description
System.Double maxGoodPoints

maximal possible relevant hits.
System.Int64 searchTime

Fields

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MAX_POINTS

Number of points for which precision is computed.

Declaration
public static readonly int MAX_POINTS
Field Value
Type Description
System.Int32

Properties

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DocNamesExtractTime

Returns the time it took to extract doc names for judging the measured query, in milliseconds.

Declaration
public virtual long DocNamesExtractTime { get; }
Property Value
Type Description
System.Int64
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MaxGoodPoints

Returns the maximal number of good points. This is the number of relevant docs known by the judge for the measured query.

Declaration
public virtual double MaxGoodPoints { get; }
Property Value
Type Description
System.Double
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MRR

Returns the Mean reciprocal rank over the queries or RR for a single query.

Declaration
public virtual double MRR { get; }
Property Value
Type Description
System.Double
Remarks

Reciprocal rank is defined as 1/r where r is the rank of the first correct result, or 0 if there are no correct results within the top 5 results.

This follows the definition in Question Answering - CNLP at the TREC-10 Question Answering Track.

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NumGoodPoints

Returns the number of good points (only relevant points).

Declaration
public virtual double NumGoodPoints { get; }
Property Value
Type Description
System.Double
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NumPoints

Returns the number of points (both relevant and irrelevant points).

Declaration
public virtual double NumPoints { get; }
Property Value
Type Description
System.Double
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Recall

Return the recall: |{relevant hits found}| / |{relevant hits existing}|.

Declaration
public virtual double Recall { get; }
Property Value
Type Description
System.Double
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SearchTime

Returns the search time in milliseconds for the measured query.

Declaration
public virtual long SearchTime { get; }
Property Value
Type Description
System.Int64

Methods

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AddResult(Int32, Boolean, Int64)

Add a (possibly relevant) doc.

Declaration
public virtual void AddResult(int n, bool isRelevant, long docNameExtractTime)
Parameters
Type Name Description
System.Int32 n

rank of the added doc (its ordinal position within the query results).
System.Boolean isRelevant

true if the added doc is relevant, false otherwise.
System.Int64 docNameExtractTime
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Average(QualityStats[])

Create a QualityStats object that is the average of the input QualityStats objects.

Declaration
public static QualityStats Average(QualityStats[] stats)
Parameters
Type Name Description
QualityStats[] stats

array of input stats to be averaged.
Returns
Type Description
QualityStats

an average over the input stats.
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GetAvp()

Return the average precision at recall points.

Declaration
public virtual double GetAvp()
Returns
Type Description
System.Double
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GetPrecisionAt(Int32)

Return the precision at rank n: |{relevant hits within first n hits}| / n.

Declaration
public virtual double GetPrecisionAt(int n)
Parameters
Type Name Description
System.Int32 n

requested precision point, must be at least 1 and at most MAX_POINTS.
Returns
Type Description
System.Double
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GetRecallPoints()

Returns the recallPoints.

Declaration
public virtual QualityStats.RecallPoint[] GetRecallPoints()
Returns
Type Description
QualityStats.RecallPoint[]
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Log(String, Int32, TextWriter, String)

Log information on this QualityStats object.

Declaration
public virtual void Log(string title, int paddLines, TextWriter logger, string prefix)
Parameters
Type Name Description
System.String title
System.Int32 paddLines
TextWriter logger

Logger.
System.String prefix

prefix before each log line.