edu.rice.comp440.net

Class HiddenUnit

java.lang.Object

edu.rice.comp440.net.HiddenUnit

All Implemented Interfaces:

Unit, java.io.Serializable

public class HiddenUnit
extends java.lang.Object
implements Unit

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static int	MAX_INITIAL_WEIGHT
static int	MIN_INITIAL_WEIGHT
protected Unit[]	units
protected double	value
double[]	weights

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	HiddenUnit(Unit[] units, double[] weights) Builds a hidden unit taking the provided number of inputs.
protected	HiddenUnit(Unit[] units, java.util.Random random) Builds a hidden unit taking the provided number of inputs.

Method Summary

Methods

Modifier and Type	Method and Description
protected double	getSum() Returns the sum of all of the inputs and weights
double	getValue() Returns the current value of this input
void	randomizeWeights(java.util.Random random) Generates a new weight
void	recompute() Recomputes the value of this hidden unit, querying it's prior inputs.
protected double	sigmoid(double x) Implements the sigmoid function to provide the non-linearity to this function.

Methods inherited from class java.lang.Object

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

Field Detail

MIN_INITIAL_WEIGHT

public static final int MIN_INITIAL_WEIGHT

See Also:

Constant Field Values

MAX_INITIAL_WEIGHT

public static final int MAX_INITIAL_WEIGHT

See Also:

Constant Field Values

weights

public double[] weights

units

protected Unit[] units

value

protected double value

Constructor Detail

HiddenUnit

protected HiddenUnit(Unit[] units,
          java.util.Random random)

Builds a hidden unit taking the provided number of inputs. Sets the initial weights to be random values to be 0.

Parameters:

units - The input units to this unit

random - The random number generator

HiddenUnit

protected HiddenUnit(Unit[] units,
          double[] weights)

Builds a hidden unit taking the provided number of inputs. Sets the initial weights to be a copy of the provided weights

Parameters:

units - The input units to this unit

weights - The weights to use

Method Detail

randomizeWeights

public void randomizeWeights(java.util.Random random)

Generates a new weight

Parameters:

random - The rng

getSum

protected double getSum()

Returns the sum of all of the inputs and weights

Returns:

the sum

recompute

public void recompute()

Recomputes the value of this hidden unit, querying it's prior inputs.

Specified by:

recompute in interface Unit

getValue

public double getValue()

Returns the current value of this input

Specified by:

getValue in interface Unit

Returns:

The current value of this input

sigmoid

protected double sigmoid(double x)

Implements the sigmoid function to provide the non-linearity to this function. Simply returns 1 / (1 + e^-x)

Parameters:

x - The value to apply the function to

Returns:

The result