cc.mallet.fst.semi_supervised.constraints
Class TwoLabelL2GEConstraints

java.lang.Object
  cc.mallet.fst.semi_supervised.constraints.TwoLabelGEConstraints
      cc.mallet.fst.semi_supervised.constraints.TwoLabelL2GEConstraints

All Implemented Interfaces:

GEConstraint

public class TwoLabelL2GEConstraints
extends TwoLabelGEConstraints

A set of constraints on distributions over consecutive labels conditioned an input features. 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.

Author:

Gregory Druck

Nested Class Summary

protected class

TwoLabelL2GEConstraints.TwoLabelL2GEConstraint

Nested classes/interfaces inherited from class cc.mallet.fst.semi_supervised.constraints.TwoLabelGEConstraints

TwoLabelGEConstraints.TwoLabelGEConstraint

Field Summary

Fields inherited from class cc.mallet.fst.semi_supervised.constraints.TwoLabelGEConstraints

cache, constraintsList, constraintsMap, map

Constructor Summary

TwoLabelL2GEConstraints()

Method Summary

void	addConstraint(int fi, double[][] target, double weight)
GEConstraint	copy() This is used in multi-threading.
double	getValue() Returns the total constraint value.

Methods inherited from class cc.mallet.fst.semi_supervised.constraints.TwoLabelGEConstraints

computeExpectations, getCompositeConstraintFeatureValue, isOneStateConstraint, preProcess, preProcess, setStateLabelMap, zeroExpectations

Methods inherited from class java.lang.Object

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

Constructor Detail

TwoLabelL2GEConstraints

public TwoLabelL2GEConstraints()

Method Detail

copy

public GEConstraint copy()

Description copied from interface: GEConstraint

This is used in multi-threading.

Returns:

A copy of the GEConstraint.

addConstraint

public void addConstraint(int fi,
                          double[][] target,
                          double weight)

Specified by:

addConstraint in class TwoLabelGEConstraints

Parameters:

fi - Input feature index

target - Target distribution over pairs of labels

weight - Weight of this constraint

getValue

public double getValue()

Description copied from interface: GEConstraint

Returns the total constraint value.

Specified by:

getValue in interface GEConstraint

Specified by:

getValue in class TwoLabelGEConstraints

Returns:

Constraint value