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Class Particle

java.lang.Object
  blog.Particle

public class Particle
extends java.lang.Object

A Particle for Particle Filtering. The particle is advanced as it receives evidence and queries with calls to methods take(Evidence) and answerQueries(Collection). Providing evidence also reweights the particle according to it. A method copy() can be used for resampling.

Field Summary

int	numTimeSlicesInMemory

Constructor Summary

Particle(java.util.Set idTypes, int numTimeSlicesInMemory)
Creates a new particle.

Method Summary

void	answerQueries(java.util.Collection queries) Takes a collection of queries and answers them based on current world.
Particle	copy()
double	getLatestWeight()
PartialWorld	getLatestWorld()
protected void	setWorld(PartialWorld curWorld)
void	take(Evidence evidence) Takes evidence relative to some new time step, updates current world based on it, and recalculates particle weight according to its probability.
void	updateQueriesStats(java.util.Collection queries)

Methods inherited from class java.lang.Object

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

Field Detail

numTimeSlicesInMemory

public int numTimeSlicesInMemory

Constructor Detail

Particle

public Particle(java.util.Set idTypes,
                int numTimeSlicesInMemory)

Creates a new particle. numTimeSlicesInMemory indicates how many time slices need to be kept in memory. The properties table specifies configuration parameters.

Method Detail

take

public void take(Evidence evidence)

Takes evidence relative to some new time step, updates current world based on it, and recalculates particle weight according to its probability.

answerQueries

public void answerQueries(java.util.Collection queries)

Takes a collection of queries and answers them based on current world.

getLatestWorld

public PartialWorld getLatestWorld()

getLatestWeight

public double getLatestWeight()

copy

public Particle copy()

setWorld

protected void setWorld(PartialWorld curWorld)

updateQueriesStats

public void updateQueriesStats(java.util.Collection queries)