edu.stanford.nlp.tagger.maxent
Class LambdaSolveTagger

java.lang.Object
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  +--edu.stanford.nlp.maxent.iis.LambdaSolve
        |
        +--edu.stanford.nlp.tagger.maxent.LambdaSolveTagger

public class LambdaSolveTagger

extends LambdaSolve

This module does the working out of lambda parameters for binary tagger features. It can use either IIS or CG.

Field Summary

Fields inherited from class edu.stanford.nlp.maxent.iis.LambdaSolve

eps, fixedFnumXY, fnumArr, ftieldArr, lambda, lambda_converged, newtonerr, p, probConds, smooth, zlambda

Method Summary

boolean	checkCorrectness() Check whether the constraints are satisfied, the probabilities sum to one, etc.
double[]	getDerivatives() assuming we have the lambdas in the array and we need only the derivatives now.
double	logLikelihoodScratch() calculate the log likelihood from scratch, hashing the conditional probabilities in pcond which we will use for the derivative later.
void	readOldLambdas(String filename, String oldfilename)

Methods inherited from class edu.stanford.nlp.maxent.iis.LambdaSolve

fnum, ImprovedIterative, ImprovedIterative, logLikelihood, main, pcond, print, read, save_lambdas, save

Methods inherited from class java.lang.Object

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

Method Detail

readOldLambdas

public void readOldLambdas(String filename,
                           String oldfilename)

checkCorrectness

public boolean checkCorrectness()

Description copied from class: LambdaSolve

Check whether the constraints are satisfied, the probabilities sum to one, etc. Prints out a message if there is something wrong.

Overrides:

checkCorrectness in class LambdaSolve

logLikelihoodScratch

public double logLikelihoodScratch()

calculate the log likelihood from scratch, hashing the conditional probabilities in pcond which we will use for the derivative later.

Overrides:

logLikelihoodScratch in class LambdaSolve

getDerivatives

public double[] getDerivatives()

assuming we have the lambdas in the array and we need only the derivatives now.

Overrides:

getDerivatives in class LambdaSolve