Class BasicModelP

Implements the Poisson approximation for the binomial model for DFR.

Note

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

WARNING: for terms that do not meet the expected random distribution (e.g. stopwords), this model may give poor performance, such as abnormally high scores for low tf values.

Inheritance

object

BasicModel

BasicModelP

Inherited Members

BasicModel.Explain(BasicStats, float)

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

Namespace: Lucene.Net.Search.Similarities

Assembly: Lucene.Net.dll

Syntax

public class BasicModelP : BasicModel

Constructors

BasicModelP()

Sole constructor: parameter-free

Declaration

public BasicModelP()

Fields

LOG2_E

log2(Math.E), precomputed.

Declaration

protected static double LOG2_E

Field Value

Type	Description
double

Methods

Score(BasicStats, float)

Returns the informative content score.

Declaration

public override sealed float Score(BasicStats stats, float tfn)

Parameters

Type	Name	Description
BasicStats	stats
float	tfn

Returns

Type	Description
float

Overrides

BasicModel.Score(BasicStats, float)

ToString()

Subclasses must override this method to return the code of the basic model formula. Refer to the original paper for the list.

Declaration

public override string ToString()

Returns

Type	Description
string

Overrides

BasicModel.ToString()