com.rapidminer.operator.learner.functions.neuralnet
Class Node

java.lang.Object
  com.rapidminer.operator.learner.functions.neuralnet.Node

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

InnerNode, InputNode, OutputNode

public abstract class Node
extends java.lang.Object
implements java.io.Serializable

A node is the abstract superclass for all types of neural net nodes and also represents the connection between other nodes of the neural net. It performs most of the calculations and the feedforward / backpropagation mechanism.

Author:

Ingo Mierswa, Sebastian Land

See Also:

Serialized Form

Field Summary

protected double	currentError
protected double	currentValue
static int	HIDDEN
static int	INPUT
protected int[]	inputNodeOutputIndices
protected Node[]	inputNodes
static int	OUTPUT
protected int[]	outputNodeInputIndices
protected Node[]	outputNodes

Constructor Summary

Node(java.lang.String nodeName, int layerIndex, int nodeType)

Method Summary

boolean	areWeightsUpdated()
abstract double	calculateError(boolean calculate, Example example) Calculates the error for this node.
abstract double	calculateValue(boolean calculate, Example example) Calculates the output for this node.
static boolean	connect(Node firstNode, Node secondNode)
protected boolean	connectInput(Node inputNode, int inputNodeOutputIndex)
protected boolean	connectOutput(Node outputNode, int outputNodeInputIndex)
static boolean	disconnect(Node firstNode, Node secondNode)
protected boolean	disconnectInput(Node inputNode, int inputNodeOutputIndex)
protected boolean	disconnectOutput(Node outputNode, int outputNodeInputIndex)
int[]	getInputNodeOutputIndices()
Node[]	getInputNodes()
int	getLayerIndex()
java.lang.String	getNodeName()
int	getNodeType()
int[]	getOutputNodeInputIndices()
Node[]	getOutputNodes()
double	getWeight(int n) Returns 1.
void	reset()
void	update(Example example, double learningRate, double momentum)

Methods inherited from class java.lang.Object

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

Field Detail

INPUT

public static final int INPUT

See Also:

Constant Field Values

HIDDEN

public static final int HIDDEN

See Also:

Constant Field Values

OUTPUT

public static final int OUTPUT

See Also:

Constant Field Values

inputNodes

protected Node[] inputNodes

outputNodes

protected Node[] outputNodes

inputNodeOutputIndices

protected int[] inputNodeOutputIndices

outputNodeInputIndices

protected int[] outputNodeInputIndices

currentValue

protected double currentValue

currentError

protected double currentError

Constructor Detail

Node

public Node(java.lang.String nodeName,
            int layerIndex,
            int nodeType)

Method Detail

calculateValue

public abstract double calculateValue(boolean calculate,
                                      Example example)

Calculates the output for this node.

calculateError

public abstract double calculateError(boolean calculate,
                                      Example example)

Calculates the error for this node.

getWeight

public double getWeight(int n)

Returns 1. Subclasses should overwrite this method.

getLayerIndex

public int getLayerIndex()

getNodeName

public java.lang.String getNodeName()

getNodeType

public int getNodeType()

update

public void update(Example example,
                   double learningRate,
                   double momentum)

areWeightsUpdated

public boolean areWeightsUpdated()

reset

public void reset()

getInputNodes

public Node[] getInputNodes()

getOutputNodes

public Node[] getOutputNodes()

getInputNodeOutputIndices

public int[] getInputNodeOutputIndices()

getOutputNodeInputIndices

public int[] getOutputNodeInputIndices()

connectInput

protected boolean connectInput(Node inputNode,
                               int inputNodeOutputIndex)

connectOutput

protected boolean connectOutput(Node outputNode,
                                int outputNodeInputIndex)

disconnectInput

protected boolean disconnectInput(Node inputNode,
                                  int inputNodeOutputIndex)

disconnectOutput

protected boolean disconnectOutput(Node outputNode,
                                   int outputNodeInputIndex)

connect

public static boolean connect(Node firstNode,
                              Node secondNode)

disconnect

public static boolean disconnect(Node firstNode,
                                 Node secondNode)