edu.umass.cs.mallet.base.fst

Class Transducer.BeamLattice

java.lang.Object

edu.umass.cs.mallet.base.fst.Transducer.BeamLattice

Enclosing class:

Transducer

public class Transducer.BeamLattice
extends Object

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BeamLattice(Sequence input, Sequence output, boolean increment)
protected	BeamLattice(Sequence input, Sequence output, boolean increment, boolean saveXis)
protected	BeamLattice(Sequence input, Sequence output, boolean increment, boolean saveXis, LabelAlphabet outputAlphabet)
protected	BeamLattice(Sequence input, Sequence output, boolean increment, LabelAlphabet outputAlphabet, int[] constraints) Create a lattice that constrains its transitions such that the pairs in "constraints" are adhered to.

Method Summary

Modifier and Type	Method and Description
double	getAlpha(int ip, Transducer.State s)
double	getBeta(int ip, Transducer.State s)
double	getCost()
double	getGammaCost(int inputPosition, Transducer.State s)
double	getGammaProbability(int inputPosition, Transducer.State s)
LabelVector	getLabelingAtPosition(int outputPosition)
Transducer	getTransducer()
double	getXiCost(int ip, Transducer.State s1, Transducer.State s2)
double	getXiProbability(int ip, Transducer.State s1, Transducer.State s2)
int	length()

Methods inherited from class java.lang.Object

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

Constructor Detail

BeamLattice

protected BeamLattice(Sequence input,
                      Sequence output,
                      boolean increment)

BeamLattice

protected BeamLattice(Sequence input,
                      Sequence output,
                      boolean increment,
                      boolean saveXis)

BeamLattice

protected BeamLattice(Sequence input,
                      Sequence output,
                      boolean increment,
                      boolean saveXis,
                      LabelAlphabet outputAlphabet)

BeamLattice

protected BeamLattice(Sequence input,
                      Sequence output,
                      boolean increment,
                      LabelAlphabet outputAlphabet,
                      int[] constraints)

Create a lattice that constrains its transitions such that the pairs in "constraints" are adhered to. constraints is an array where each entry is the index of the required label at that position. An entry of 0 means there are no constraints on that . Positive values mean the path must pass through that state. Negative values mean the path must _not_ pass through that state. NOTE - constraints.length must be equal to output.size() + 1. A lattice has one extra position for the initial state. Generally, this should be unconstrained, since it does not produce an observation.

Method Detail

getCost

public double getCost()

getGammaCost

public double getGammaCost(int inputPosition,
                           Transducer.State s)

getGammaProbability

public double getGammaProbability(int inputPosition,
                                  Transducer.State s)

getXiProbability

public double getXiProbability(int ip,
                               Transducer.State s1,
                               Transducer.State s2)

getXiCost

public double getXiCost(int ip,
                        Transducer.State s1,
                        Transducer.State s2)

length

public int length()

getAlpha

public double getAlpha(int ip,
                       Transducer.State s)

getBeta

public double getBeta(int ip,
                      Transducer.State s)

getLabelingAtPosition

public LabelVector getLabelingAtPosition(int outputPosition)

getTransducer

public Transducer getTransducer()