Class PPMModel

java.lang.Object
  PPMModel

All Implemented Interfaces:

ArithmeticModel

public class PPMModel
extends Object
implements ArithmeticModel

An implementation of prediction by partial matching.

Field Summary

(package private) int	context
(package private) int	maxContext
(package private) int[]	symbols
(package private) int[]	totalCounts
(package private) PPMTree	tree

Constructor Summary

PPMModel()

PPMModel(int maxContext)

Method Summary

int	countToSymbol(int cum) Return the symbol with the cumulative count
long	highInterval(int symbol) Returns the high interval cumulative count of a symbol
long	lowInterval(int symbol) Returns the low interval cumulative count of a symbol
void	reset() State reset to the initial values
long	totalCount() Returns the total count.
void	updateModel(int symbol) Informs the model with last seen symbol.

Methods inherited from class java.lang.Object

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

Field Detail

maxContext

int maxContext

context

int context

symbols

int[] symbols

totalCounts

int[] totalCounts

tree

PPMTree tree

Constructor Detail

PPMModel

public PPMModel()

PPMModel

public PPMModel(int maxContext)

Method Detail

lowInterval

public long lowInterval(int symbol)

Returns the low interval cumulative count of a symbol

Specified by:

lowInterval in interface ArithmeticModel

highInterval

public long highInterval(int symbol)

Returns the high interval cumulative count of a symbol

Specified by:

highInterval in interface ArithmeticModel

totalCount

public long totalCount()

Returns the total count.

Specified by:

totalCount in interface ArithmeticModel

updateModel

public void updateModel(int symbol)

Informs the model with last seen symbol. Model and its frequency counts are updated accordingly

Specified by:

updateModel in interface ArithmeticModel

countToSymbol

public int countToSymbol(int cum)

Return the symbol with the cumulative count

Specified by:

countToSymbol in interface ArithmeticModel

reset

public void reset()

Description copied from interface: ArithmeticModel

State reset to the initial values

Specified by:

reset in interface ArithmeticModel