cc.mallet.fst.semi_supervised.constraints

Class OneLabelL2RangeGEConstraints

java.lang.Object

cc.mallet.fst.semi_supervised.constraints.OneLabelL2RangeGEConstraints

All Implemented Interfaces:

GEConstraint

public class OneLabelL2RangeGEConstraints
extends java.lang.Object
implements GEConstraint

A set of constraints on individual input feature label pairs. This is to be used with GE, and penalizes the L_2^2 difference between model and target distributions. Multiple constraints are grouped together here to make things more efficient.

Constructor Summary

Constructors

Constructor and Description
OneLabelL2RangeGEConstraints()

Method Summary

Modifier and Type	Method and Description
void	addConstraint(int fi, int li, double lower, double upper, double weight)
void	computeExpectations(java.util.ArrayList<SumLattice> lattices) Compute expectations using cached lattices.
GEConstraint	copy() This is used in multi-threading.
double	getCompositeConstraintFeatureValue(FeatureVector fv, int ip, int si1, int si2) Computes the composite constraint feature value (over all constraint features) for FeatureVector fv and a transition from state li1 to li2.
double	getValue() Returns the total constraint value.
boolean	isOneStateConstraint()
void	preProcess(FeatureVector fv) Gives the constraint the option to do some caching using only the FeatureVector.
java.util.BitSet	preProcess(InstanceList data)
void	setStateLabelMap(StateLabelMap map) Sets that map between the state indices and label indices.
void	zeroExpectations() Zero expectation values.

Methods inherited from class java.lang.Object

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

Constructor Detail

OneLabelL2RangeGEConstraints

public OneLabelL2RangeGEConstraints()

Method Detail

addConstraint

public void addConstraint(int fi,
                          int li,
                          double lower,
                          double upper,
                          double weight)

isOneStateConstraint

public boolean isOneStateConstraint()

Specified by:

isOneStateConstraint in interface GEConstraint

Returns:

true if constraint feature only considers one state

setStateLabelMap

public void setStateLabelMap(StateLabelMap map)

Description copied from interface: GEConstraint

Sets that map between the state indices and label indices.

Specified by:

setStateLabelMap in interface GEConstraint

Parameters:

map - StateLabelMap

preProcess

public void preProcess(FeatureVector fv)

Description copied from interface: GEConstraint

Gives the constraint the option to do some caching using only the FeatureVector. For example, the constrained input features could be cached.

Specified by:

preProcess in interface GEConstraint

Parameters:

fv - FeatureVector input

preProcess

public java.util.BitSet preProcess(InstanceList data)

Specified by:

preProcess in interface GEConstraint

Parameters:

data - Unlabeled data

Returns:

Returns a bitset of the size of the data, with the bit set if a constraint feature fires in that instance.

getCompositeConstraintFeatureValue

public double getCompositeConstraintFeatureValue(FeatureVector fv,
                                                 int ip,
                                                 int si1,
                                                 int si2)

Description copied from interface: GEConstraint

Computes the composite constraint feature value (over all constraint features) for FeatureVector fv and a transition from state li1 to li2.

Specified by:

getCompositeConstraintFeatureValue in interface GEConstraint

Parameters:

fv - FeatureVector on transition

ip - Position of input in sequence

si1 - Source state index for transition

si2 - Destination state index for transition

Returns:

Constraint feature value

getValue

public double getValue()

Description copied from interface: GEConstraint

Returns the total constraint value.

Specified by:

getValue in interface GEConstraint

Returns:

Constraint value

zeroExpectations

public void zeroExpectations()

Description copied from interface: GEConstraint

Zero expectation values. Called before re-computing gradient.

Specified by:

zeroExpectations in interface GEConstraint

computeExpectations

public void computeExpectations(java.util.ArrayList<SumLattice> lattices)

Description copied from interface: GEConstraint

Compute expectations using cached lattices.

Specified by:

computeExpectations in interface GEConstraint

Parameters:

lattices - Cached SumLattices

copy

public GEConstraint copy()

Description copied from interface: GEConstraint

This is used in multi-threading.

Specified by:

copy in interface GEConstraint

Returns:

A copy of the GEConstraint.