com.wcohen.secondstring
Class Mixture

java.lang.Object
  |
  +--com.wcohen.secondstring.AbstractStringDistance
        |
        +--com.wcohen.secondstring.AbstractStatisticalTokenDistance
              |
              +--com.wcohen.secondstring.Mixture

All Implemented Interfaces:

StringDistance

public class Mixture

extends AbstractStatisticalTokenDistance

Mixture-based distance metric.

Field Summary

Fields inherited from class com.wcohen.secondstring.AbstractStatisticalTokenDistance

collectionSize, documentFrequency, tokenizer, totalTokenCount

Constructor Summary

Mixture()

Mixture(Tokenizer tokenizer)

Method Summary

java.lang.String	explainScore(StringWrapper s, StringWrapper t) Explain how the distance was computed.
static void	main(java.lang.String[] argv)
StringWrapper	prepare(java.lang.String s) Preprocess a string by finding tokens and giving them Mixture weights
double	score(StringWrapper s, StringWrapper t) Distance is argmax_lambda prod_{w in s} lambda Pr(w|t) * (1-lambda) Pr(w|background).
java.lang.String	toString()

Methods inherited from class com.wcohen.secondstring.AbstractStatisticalTokenDistance

accumulateStatistics, getDocumentFrequency

Methods inherited from class com.wcohen.secondstring.AbstractStringDistance

doMain, explainScore, score

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Mixture

public Mixture(Tokenizer tokenizer)

Mixture

public Mixture()

Method Detail

score

public double score(StringWrapper s,
                    StringWrapper t)

Distance is argmax_lambda prod_{w in s} lambda Pr(w|t) * (1-lambda) Pr(w|background). This is computed with E/M.

Specified by:

score in interface StringDistance

Specified by:

score in class AbstractStringDistance

prepare

public StringWrapper prepare(java.lang.String s)

Preprocess a string by finding tokens and giving them Mixture weights

Specified by:

prepare in interface StringDistance

Overrides:

prepare in class AbstractStringDistance

explainScore

public java.lang.String explainScore(StringWrapper s,
                                     StringWrapper t)

Explain how the distance was computed. In the output, the tokens in S and T are listed, and the common tokens are marked with an asterisk.

Specified by:

explainScore in interface StringDistance

Specified by:

explainScore in class AbstractStringDistance

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

main

public static void main(java.lang.String[] argv)