marf.Classification.Stochastic
Class MaxProbabilityClassifier

java.lang.Object
  marf.Storage.StorageManager
      marf.Classification.Classification
          marf.Classification.Stochastic.Stochastic
              marf.Classification.Stochastic.MaxProbabilityClassifier

All Implemented Interfaces:

java.lang.Cloneable, IClassification, IStorageManager, java.io.Serializable

public class MaxProbabilityClassifier

extends Stochastic

Maximum Probability Classification Module. Originally came with the LangIdentApp NLP application of Serguei Mokhov.

$Id: MaxProbabilityClassifier.java,v 1.24 2006/02/12 23:57:58 mokhov Exp $

Since:

0.3.0.2

Version:

$Revision: 1.24 $

Author:

Serguei Mokhov

See Also:

Serialized Form

Field Summary

protected java.util.Vector	oAvailLanguages A collection of available natural languages.
protected StatisticalEstimator	oStatisticalEstimator Local reference to some instance of a statistical estimator for probability computation.

Fields inherited from class marf.Classification.Classification

oFeatureExtraction, oResultSet, oTrainingSet

Fields inherited from class marf.Storage.StorageManager

bDumpOnNotFound, iCurrentDumpMode, oObjectToSerialize, strFilename

Fields inherited from interface marf.Classification.IClassification

MARF_INTERFACE_CODE_REVISION

Fields inherited from interface marf.Storage.IStorageManager

DUMP_BINARY, DUMP_CSV_TEXT, DUMP_GZIP_BINARY, DUMP_HTML, DUMP_SQL, DUMP_XML, MARF_INTERFACE_CODE_REVISION, STORAGE_FILE_EXTENSIONS

Constructor Summary

MaxProbabilityClassifier(IFeatureExtraction poFeatureExtraction)
Implements Classification API.

MaxProbabilityClassifier(StatisticalEstimator poStatisticalEstimator)
NLP constructor that takes directly a statistical estimator.

Method Summary

void	backSynchronizeObject() Add a piece of general StorageManager contract.
boolean	classify() Performs language classification.
void	dump() An object must know how dump itself or its data structures to a file.
static java.lang.String	getMARFSourceCodeRevision() Retrieves class' revision.
void	init(StatisticalEstimator poStatisticalEstimator) Initializes the classifier with all member variables.
void	restore() An object must know how restore itself or its data structures from a file.
boolean	train() Performs training of underlying statistical estimator and goes through restore/dump cycle to save the available languages.

Methods inherited from class marf.Classification.Stochastic.Stochastic

getResult

Methods inherited from class marf.Classification.Classification

clone, getFeatureExtraction, getResultSet, getTrainingSetFilename, setFeatureExtraction

Methods inherited from class marf.Storage.StorageManager

dumpBinary, dumpCSV, dumpGzipBinary, dumpHTML, dumpSQL, dumpXML, enableDumpOnNotFound, equals, getDefaultExtension, getDefaultExtension, getDumpMode, getFilename, hashCode, restoreBinary, restoreCSV, restoreGzipBinary, restoreHTML, restoreSQL, restoreXML, setDumpMode, setFilename, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

oStatisticalEstimator

protected StatisticalEstimator oStatisticalEstimator

Local reference to some instance of a statistical estimator for probability computation.

oAvailLanguages

protected java.util.Vector oAvailLanguages

A collection of available natural languages.

Constructor Detail

MaxProbabilityClassifier

public MaxProbabilityClassifier(StatisticalEstimator poStatisticalEstimator)

NLP constructor that takes directly a statistical estimator.

Parameters:

poStatisticalEstimator - statistical estimator to use

MaxProbabilityClassifier

public MaxProbabilityClassifier(IFeatureExtraction poFeatureExtraction)

Implements Classification API.

Parameters:

poFeatureExtraction - FeatureExtraction module reference

Method Detail

init

public void init(StatisticalEstimator poStatisticalEstimator)

Initializes the classifier with all member variables.

Parameters:

poStatisticalEstimator - statistical estimator to use

Throws:

java.lang.IllegalArgumentException - if poStatisticalEstimator is null

train

public boolean train()
              throws ClassificationException

Performs training of underlying statistical estimator and goes through restore/dump cycle to save the available languages. Implements Classification API.

Specified by:

train in interface IClassification

Overrides:

train in class Stochastic

Returns:

true

Throws:

ClassificationException - should there be a problem with dump/restore

classify

public boolean classify()
                 throws ClassificationException

Performs language classification. Implements Classification API.

Specified by:

classify in interface IClassification

Overrides:

classify in class Stochastic

Returns:

true if classification was successful

Throws:

ClassificationException - if there was a problem with I/O or if there are no available languages

backSynchronizeObject

public void backSynchronizeObject()

Add a piece of general StorageManager contract. Resets available languages vector from the object-to-serialize reference.

Overrides:

backSynchronizeObject in class StorageManager

Since:

0.3.0.5

See Also:

StorageManager.restore()

dump

public void dump()
          throws StorageException

An object must know how dump itself or its data structures to a file. It only uses DUMP_GZIP_BINARY and DUMP_BINARY modes.

Specified by:

dump in interface IStorageManager

Overrides:

dump in class Classification

Throws:

StorageException - if saving to a file for some reason fails or the dump mode set to an unsupported value

Since:

0.3.0.5

See Also:

StorageManager.dumpGzipBinary(), StorageManager.dumpBinary(), backSynchronizeObject()

restore

public void restore()
             throws StorageException

An object must know how restore itself or its data structures from a file. Options are: Object serialization and CSV, HTML. Internally, the method calls all the restore*() methods based on the current dump mode.

Specified by:

restore in interface IStorageManager

Overrides:

restore in class Classification

Throws:

StorageException - if loading from a file for some reason fails or the dump mode set to an unsupported value

Since:

0.3.0.5

See Also:

IStorageManager.DUMP_GZIP_BINARY, IStorageManager.DUMP_BINARY, StorageManager.dumpGzipBinary(), StorageManager.dumpBinary(), backSynchronizeObject(), StorageManager.iCurrentDumpMode

getMARFSourceCodeRevision

public static java.lang.String getMARFSourceCodeRevision()

Retrieves class' revision.

Returns:

revision string