org.knime.base.data.neural
Class SigmoidPerceptron

java.lang.Object
  org.knime.base.data.neural.Perceptron
      org.knime.base.data.neural.SigmoidPerceptron

public class SigmoidPerceptron
extends Perceptron

A hidden layer perceptron with a sigmoid activation function.

Author:

Nicolas Cebron, University of Konstanz

Constructor Summary

SigmoidPerceptron()
Constructs an empty perceptron.

SigmoidPerceptron(double[] weights, Perceptron[] predecessors)
Constructs a perceptron with given weights and predecessors.

SigmoidPerceptron(Perceptron[] predecessors)
Constructs a perceptron with given predecessors, weights initialized randomly.

Method Summary

double	activationFunction(double in) Sigmoid activation function, computes the sigmoid value of its argument.
Perceptron	getPredecessor(int i) Returns the predecessor at a given position.
Perceptron[]	getPredecessors() Returns the predecessors.
double	output() Returns the output.
void	setPredecessor(int i, Perceptron predecessor) Set predecessor at a given position.
void	setPredecessors(Perceptron[] predecessors) Sets the predecessors.

Methods inherited from class org.knime.base.data.neural.Perceptron

evaluate, getClassValue, getThreshold, getWeight, getWeights, random, scalarProduct, setClassValue, setThreshold, setWeight, setWeights

Methods inherited from class java.lang.Object

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

Constructor Detail

SigmoidPerceptron

public SigmoidPerceptron(double[] weights,
                         Perceptron[] predecessors)

Constructs a perceptron with given weights and predecessors.

Parameters:

weights - the weights for the perceptron

predecessors - the predecessor perceptrons

SigmoidPerceptron

public SigmoidPerceptron(Perceptron[] predecessors)

Constructs a perceptron with given predecessors, weights initialized randomly.

Parameters:

predecessors - the predecessor perceptrons

SigmoidPerceptron

public SigmoidPerceptron()

Constructs an empty perceptron.

Method Detail

getPredecessors

public Perceptron[] getPredecessors()

Returns the predecessors.

Returns:

predecessors of the perceptron

getPredecessor

public Perceptron getPredecessor(int i)

Returns the predecessor at a given position.

Parameters:

i - position

Returns:

Predecessor at position i

setPredecessors

public void setPredecessors(Perceptron[] predecessors)

Sets the predecessors.

Parameters:

predecessors - new predecessors for the perceptron

setPredecessor

public void setPredecessor(int i,
                           Perceptron predecessor)

Set predecessor at a given position.

Parameters:

i - position

predecessor - new predecessor for position i

output

public double output()

Returns the output.

Specified by:

output in class Perceptron

Returns:

output

activationFunction

public double activationFunction(double in)

Sigmoid activation function, computes the sigmoid value of its argument.

Specified by:

activationFunction in class Perceptron

Parameters:

in - argument to compute

Returns:

1/(1+e^-in)