mark.nlp.features
Class MutualInformation

java.lang.Object
  |
  +--mark.nlp.features.ClassificationOrderer
        |
        +--mark.nlp.features.SimpleOrderer
              |
              +--mark.nlp.features.MutualInformation

All Implemented Interfaces:

Orderer

public class MutualInformation

extends SimpleOrderer

A SimpleOrderer that orders according to the following formula: score (w) = sum_c_in_C_and_w_in_W [p(c,w) * log [p(c,w) / p(c) / p(w)]] where C is the set of categories and V is {^w,w}. This orderer ignores its parameter.

Field Summary

Fields inherited from class mark.nlp.features.ClassificationOrderer

fCatCounters, fCounter, fPotentialFeatures

Constructor Summary

MutualInformation()

Method Summary

double

updateScore(double oldScore, double numCW, double numC, double numW, double num)

Methods inherited from class mark.nlp.features.SimpleOrderer

computeJustScores, computeJustScores, computeScores

Methods inherited from class mark.nlp.features.ClassificationOrderer

order, setParameter

Methods inherited from class java.lang.Object

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

Constructor Detail

MutualInformation

public MutualInformation()

Method Detail

updateScore

public double updateScore(double oldScore,
                          double numCW,
                          double numC,
                          double numW,
                          double num)

Specified by:

updateScore in class SimpleOrderer