marf.Stats.StatisticalEstimators.Smoothing
Class AddDelta

java.lang.Object
  marf.Storage.StorageManager
      marf.Stats.StatisticalEstimators.StatisticalEstimator
          marf.Stats.StatisticalEstimators.Smoothing.Smoothing
              marf.Stats.StatisticalEstimators.Smoothing.AddDelta

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, IStatisticalEstimator, ISmoothing, IStorageManager

Direct Known Subclasses:

AddOne, MLE

public class AddDelta
extends Smoothing

Add-Delta Smoothing Estimator. The delta in fact determines the type of an estimator, e.g. 0.5 is for ELE, 0.0 for MLE, 1.0 for Add-One are the special cases.

$Id: AddDelta.java,v 1.34 2007/12/18 21:57:15 mokhov Exp $

Since:

0.3.0.2

Version:

$Revision: 1.34 $

Author:

Serguei Mokhov

See Also:

Serialized Form

Field Summary

protected double

dDelta Default is 0.5: Expected Likelihood Estimation (ELE).

Fields inherited from class marf.Stats.StatisticalEstimators.StatisticalEstimator

oProbabilityTable, oStreamTokenizer

Fields inherited from class marf.Storage.StorageManager

bDumpOnNotFound, iCurrentDumpMode, oObjectToSerialize, strFilename

Fields inherited from interface marf.Stats.StatisticalEstimators.Smoothing.ISmoothing

MARF_INTERFACE_CODE_REVISION

Fields inherited from interface marf.Stats.StatisticalEstimators.IStatisticalEstimator

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

AddDelta(double pdDelta)
Constructs the estimator with the specified delta.

Method Summary

double	getDelta() Allows querying for the current value of delta.
static java.lang.String	getMARFSourceCodeRevision() Returns source code revision information.
boolean	smooth() Implements add-delta smoothing for uni-, bi-, and tri-grams.

Methods inherited from class marf.Stats.StatisticalEstimators.Smoothing.Smoothing

train

Methods inherited from class marf.Stats.StatisticalEstimators.StatisticalEstimator

backSynchronizeObject, dumpCSV, dumpXML, getFilename, getLanguage, getProbabilityTable, getStreamTokenizer, p, resetFilename, restoreCSV, restoreXML, setLanguage, setStreamTokenizer

Methods inherited from class marf.Storage.StorageManager

clone, dump, dumpBinary, dumpGzipBinary, dumpHTML, dumpSQL, enableDumpOnNotFound, equals, getDefaultExtension, getDefaultExtension, getDumpMode, getObjectToSerialize, hashCode, restore, restoreBinary, restoreGzipBinary, restoreHTML, restoreSQL, setDumpMode, setFilename, toString

Methods inherited from class java.lang.Object

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

Field Detail

dDelta

protected double dDelta

Default is 0.5: Expected Likelihood Estimation (ELE).

Constructor Detail

AddDelta

public AddDelta(double pdDelta)

Constructs the estimator with the specified delta.

Parameters:

pdDelta - the delta

Method Detail

getDelta

public final double getDelta()

Allows querying for the current value of delta.

Returns:

the current value of delta

smooth

public boolean smooth()

Implements add-delta smoothing for uni-, bi-, and tri-grams.

Returns:

true if any smoothing took place and underlying data was altered

See Also:

ISmoothing.smooth()

getMARFSourceCodeRevision

public static java.lang.String getMARFSourceCodeRevision()

Returns source code revision information.

Returns:

revision string