cc.mallet.fst
Class TransducerEvaluator

java.lang.Object
  cc.mallet.fst.TransducerEvaluator

Direct Known Subclasses:

CRFWriter, InstanceAccuracyEvaluator, LabelDistributionEvaluator, MultiSegmentationEvaluator, PerClassAccuracyEvaluator, SegmentationEvaluator, TokenAccuracyEvaluator, ViterbiWriter

public abstract class TransducerEvaluator
extends java.lang.Object

An abstract class to evaluate a transducer model.

Field Summary

protected java.lang.String[]	instanceListDescriptions
protected InstanceList[]	instanceLists

Constructor Summary

TransducerEvaluator()

TransducerEvaluator(InstanceList[] instanceLists, java.lang.String[] instanceListDescriptions)

Method Summary

void	evaluate(TransducerTrainer tt) Evaluates a TransducerTrainer and its Transducer on the instance lists specified in the constructor.
abstract void	evaluateInstanceList(TransducerTrainer transducer, InstanceList instances, java.lang.String description)
protected void	preamble(TransducerTrainer tt)
boolean	precondition(TransducerTrainer tt) If this returns false, then the body of the evaluate(TransducerTrainer) method will not run.

Methods inherited from class java.lang.Object

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

Field Detail

instanceLists

protected InstanceList[] instanceLists

instanceListDescriptions

protected java.lang.String[] instanceListDescriptions

Constructor Detail

TransducerEvaluator

public TransducerEvaluator()

TransducerEvaluator

public TransducerEvaluator(InstanceList[] instanceLists,
                           java.lang.String[] instanceListDescriptions)

Method Detail

evaluate

public void evaluate(TransducerTrainer tt)

Evaluates a TransducerTrainer and its Transducer on the instance lists specified in the constructor. .

The default implementation calls the evaluator's evaluateInstanceList on each instance list.

Parameters:

tt - The TransducerTrainer to evaluate.

preamble

protected void preamble(TransducerTrainer tt)

precondition

public boolean precondition(TransducerTrainer tt)

If this returns false, then the body of the evaluate(TransducerTrainer) method will not run. Use this method to implement behaviors such as only evaluating every 5 iterations with new TokenAccuracyEvaluator (crft) { public boolean precondition (TransducerTrainer tt) { return tt.getIteration() % 5 == 0; };

evaluateInstanceList

public abstract void evaluateInstanceList(TransducerTrainer transducer,
                                          InstanceList instances,
                                          java.lang.String description)