cc.mallet.grmm.inference
Class Utils

java.lang.Object
  cc.mallet.grmm.inference.Utils

public class Utils
extends java.lang.Object

A bunch of static utilities useful for dealing with Inferencers. Created: Jun 1, 2005

Version:

$Id: Utils.java,v 1.1 2007/10/22 21:37:49 mccallum Exp $

Author:

Constructor Summary

Utils()

Method Summary

static double[]	allL1MarginalDistance(FactorGraph mdl, Inferencer inf1, Inferencer inf2)
static double	avgL1MarginalDistance(FactorGraph mdl, Inferencer inf1, Inferencer inf2)
static VarSet	defaultIntersection(VarSet v1, VarSet v2)
static double	localMagnetization(Inferencer inferencer, Variable var)
static double	lookupMinusLogZ(FactorGraph mdl, Inferencer inf) Returns ths value of -log Z in mdl according to the given inferencer.
static double	maxL1MarginalDistance(FactorGraph mdl, Inferencer inf1, Inferencer inf2)
static int[]	toSizesArray(Variable[] vars)

Methods inherited from class java.lang.Object

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

Constructor Detail

Utils

public Utils()

Method Detail

lookupMinusLogZ

public static double lookupMinusLogZ(FactorGraph mdl,
                                     Inferencer inf)

Returns ths value of -log Z in mdl according to the given inferencer. If inf is exact, the answer will be exact; otherwise the answer will be approximation

Parameters:

mdl -

inf - An inferencer. inf.computeMarginals (mdl) must already have been called.

Returns:

The value of -logZ

localMagnetization

public static double localMagnetization(Inferencer inferencer,
                                        Variable var)

allL1MarginalDistance

public static double[] allL1MarginalDistance(FactorGraph mdl,
                                             Inferencer inf1,
                                             Inferencer inf2)

avgL1MarginalDistance

public static double avgL1MarginalDistance(FactorGraph mdl,
                                           Inferencer inf1,
                                           Inferencer inf2)

maxL1MarginalDistance

public static double maxL1MarginalDistance(FactorGraph mdl,
                                           Inferencer inf1,
                                           Inferencer inf2)

toSizesArray

public static int[] toSizesArray(Variable[] vars)

defaultIntersection

public static VarSet defaultIntersection(VarSet v1,
                                         VarSet v2)