org.simnet.networks
Class Hopfield

java.lang.Object
  org.simnet.interfaces.Network
      org.simnet.networks.Hopfield

All Implemented Interfaces:

EventListener, WorldListener

public class Hopfield
extends Network

Hopfield.

Field Summary

static int	RANDOM_UPDATE Random update.
static int	SEQUENTIAL_UPDATE Sequential update.

Fields inherited from class org.simnet.interfaces.Network

CONTINUOUS, DISCRETE

Constructor Summary

Hopfield()
Default constructor.

Hopfield(int numNeurons, Layout layout)
Creates a new hopfield network.

Method Summary

void	createConnections() Create full symmetric connections without self-connections.
int	getNumUnits()
int	getUpdateOrder()
void	randomizeWeights() Randomize weights symmetrically.
void	setUpdateOrder(int updateOrder) Sets the update order.
void	train() Apply hopfield training rule to current activation pattern.
void	update() Update nodes randomly or sequentially.

Methods inherited from class org.simnet.interfaces.Network

addNetwork, addNetworkList, addNetworkListener, addNeuron, addNeuron, addNeuronList, addWeight, addWeight, changeNeuron, changeSynapse, checkAllBounds, clearActivations, clearInputs, close, deleteNetwork, deleteNeuron, deleteNeuron, deleteWeight, deleteWeight, fireClampChanged, fireCouplingChanged, fireNetworkChanged, fireNeuronAdded, fireNeuronChanged, fireNeuronDeleted, fireSubnetAdded, fireSubnetDeleted, fireSynapseAdded, fireSynapseChanged, fireSynapseDeleted, getClampNeurons, getClampWeights, getCouplingList, getDepth, getFlatNetworkList, getFlatNeuronList, getFlatSynapseList, getId, getIndents, getInputNeurons, getInteractionMode, getListenerList, getNetwork, getNetworkList, getNetworkParent, getNetworkThread, getNeuron, getNeuron, getNeuronCount, getNeuronList, getOutputNeurons, getPrecision, getRoot, getRoundingOff, getState, getSynapse, getTime, getTimeLabel, getTimeStep, getTimeType, getType, getUnits, getWeight, getWeight, getWeight, getWeightCount, getWeightList, getWorkspace, init, initNeurons, initParents, initWeights, isRoot, isRoundOffActivationValues, isUpdateCompleted, randomizeNeurons, removeNetworkListener, round, roundAll, setClampNeurons, setClampWeights, setId, setInteractionMode, setLowerBounds, setNetworkList, setNetworkParent, setNetworkThread, setNeuronList, setPrecision, setRoundingOff, setRoundOffActivationValues, setTime, setTimeStep, setUpdateCompleted, setUpperBounds, setWeightList, setWeightsToZero, setWorkspace, toString, updateAllNetworks, updateAllNeurons, updateAllWeights, updateIds, updateInputs, updateTime, updateTimeType, updateTopLevel, updateWorldListeners, updateWorlds, worldChanged

Methods inherited from class java.lang.Object

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

Field Detail

RANDOM_UPDATE

public static final int RANDOM_UPDATE

Random update.

See Also:

Constant Field Values

SEQUENTIAL_UPDATE

public static final int SEQUENTIAL_UPDATE

Sequential update.

See Also:

Constant Field Values

Constructor Detail

Hopfield

public Hopfield()

Default constructor.

Hopfield

public Hopfield(int numNeurons,
                Layout layout)

Creates a new hopfield network.

Parameters:

numNeurons - Number of neurons in new network

layout - Neuron layout patern

Method Detail

createConnections

public void createConnections()

Create full symmetric connections without self-connections.

randomizeWeights

public void randomizeWeights()

Randomize weights symmetrically.

Overrides:

randomizeWeights in class Network

train

public void train()

Apply hopfield training rule to current activation pattern.

update

public void update()

Update nodes randomly or sequentially.

Specified by:

update in class Network

getNumUnits

public int getNumUnits()

Returns:

The number of neurons.

getUpdateOrder

public int getUpdateOrder()

Returns:

The update order.

setUpdateOrder

public void setUpdateOrder(int updateOrder)

Sets the update order.

Parameters:

updateOrder - The value to set