org.joone.structure

Class ContextNode

java.lang.Object

org.joone.structure.AbstractNode

org.joone.structure.ContextNode

All Implemented Interfaces:

Node

public class ContextNode
extends AbstractNode

A context node. A context node is a node that has an initial state and that also blends in the prior outputs from its own input nodes with the current output. To cater for simulations, where repeated runs from the same state is required, it is possible to switch it into fixed mode. In fixed mode, the internal state is retained, not updated with new patterns, until out of fixed mode again.

Author:

mg

Field Summary

Fields

Modifier and Type	Field and Description
protected double	decay The context node's decay rate
protected boolean	fixed True if the node is in fixed state at present
protected double	fixedState Internal variable used to store fixed state
protected double	initialState The node's initial state

Fields inherited from class org.joone.structure.AbstractNode

connections, derivativeFunction, lastDerivative, lastDerivativePattern, lastInputValue, lastOutputValue, lastPattern, order, transportFunction

Constructor Summary

Constructors

Constructor and Description
ContextNode()

Method Summary

Methods

Modifier and Type	Method and Description
double	getDecay() Retrieve the decay rate
double	getInitialState() Retrieve the initial state
double	getInputValue(int pattern) The node's input value at the given pattern number
boolean	isFixed() Retrieve the fixed state of the node
void	setDecay(double decay) Set the context node decay rate
void	setFixed(boolean fixed) Set the fixed state of the node
void	setInitialState(double initialState) Set the initial state

Methods inherited from class org.joone.structure.AbstractNode

calculateOrder, getConnections, getDerivative, getOrder, getOutputValue, getTreeNode, setOrder

Methods inherited from class java.lang.Object

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

Field Detail

decay

protected double decay

The context node's decay rate

initialState

protected double initialState

The node's initial state

fixed

protected boolean fixed

True if the node is in fixed state at present

fixedState

protected double fixedState

Internal variable used to store fixed state

Constructor Detail

ContextNode

public ContextNode()

Method Detail

setDecay

public void setDecay(double decay)

Set the context node decay rate

getDecay

public double getDecay()

Retrieve the decay rate

setInitialState

public void setInitialState(double initialState)

Set the initial state

getInitialState

public double getInitialState()

Retrieve the initial state

setFixed

public void setFixed(boolean fixed)

Set the fixed state of the node

isFixed

public boolean isFixed()

Retrieve the fixed state of the node

getInputValue

public double getInputValue(int pattern)

The node's input value at the given pattern number

Specified by:

getInputValue in interface Node

Overrides:

getInputValue in class AbstractNode

Parameters:

pattern - the pattern number, 1 for the first pattern