edu.cmu.minorthird.classify.sequential
Class CMMTweaker

java.lang.Object
  edu.cmu.minorthird.classify.sequential.CMMTweaker

All Implemented Interfaces:

SequenceConstants

public class CMMTweaker
extends java.lang.Object
implements SequenceConstants

Adjust the precision-recall of a CMM that is based on an array of hyperplanes, by adjusting the bias term of the hyperplane associated with the background (NEG) class. This is intended mainly for adjusting precision-recall performance of extractors learned by CollinsPerceptronLearner and CRFLearner.

Author:

William Cohen

Field Summary

Fields inherited from interface edu.cmu.minorthird.classify.sequential.SequenceConstants

HISTORY_FEATURE, NULL_CLASS_NAME

Constructor Summary

CMMTweaker()

Method Summary

double	newBias() Return the value of bias term after tweaking.
double	oldBias() Return the value of bias term before the last tweak.
CMM	tweak(CMM cmm, double bias) Return a copy of a CMM in which the one bias term, for the hyperplane corresponding to the NEG class, has been changed.

Methods inherited from class java.lang.Object

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

Constructor Detail

CMMTweaker

public CMMTweaker()

Method Detail

oldBias

public double oldBias()

Return the value of bias term before the last tweak.

newBias

public double newBias()

Return the value of bias term after tweaking.

tweak

public CMM tweak(CMM cmm,
                 double bias)

Return a copy of a CMM in which the one bias term, for the hyperplane corresponding to the NEG class, has been changed. The original CMM will not be modified.