FahlmanTeacherSynapse

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org.joone.engine.learning
Class FahlmanTeacherSynapse

java.lang.Object
  org.joone.engine.Synapse
      org.joone.engine.learning.AbstractTeacherSynapse
          org.joone.engine.learning.TeacherSynapse
              org.joone.engine.learning.FahlmanTeacherSynapse

All Implemented Interfaces:: java.util.EventListener, org.joone.engine.InputPatternListener, org.joone.inspection.Inspectable, org.joone.engine.Learnable, org.joone.engine.LearnableSynapse, org.joone.engine.NeuralElement, org.joone.engine.NeuralNetListener, org.joone.engine.OutputPatternListener, java.io.Serializable

public class FahlmanTeacherSynapse
extends TeacherSynapse

This class extends the normal Teacher synapse and implements the Fahlman 40-20-40 criterion (the values can be changed). This teacher makes only sense in case of binary outputs.

In case of the default values (40-20-40) and considering [0,1] binary outputs the criterion is fullfilled if for all patterns the output is within [0, 0.4] in case where the desired output is 0 and the output is within [0.6, 1] in case where the desired output is 1.

More obout this criterion can be found at http://citeseer.ist.psu.edu/fahlman88empirical.html.

Field Summary

static java.lang.String CRITERION
          Constant to indicate (key) the parameter for checking (in the monitor object) if the criterion has been forfilled or not.

protected static org.joone.log.ILogger log
          Logger

private double lowerBit
          The lowerbit value (of the desired output), by default 0.

private double lowerBitPercentage
          The percentage that is considered as a lowerbit, by default 0.4.

private double upperBit
          The upperbit value (of the desired output), by default 1.

private double upperBitPercentage
          The percentage that is considered as a upperbit, by default 0.4.

Fields inherited from class org.joone.engine.learning.TeacherSynapse

GlobalError

Fields inherited from class org.joone.engine.learning.AbstractTeacherSynapse

desired, error

Fields inherited from class org.joone.engine.Synapse

array, b_pattern, bitems, bouts, count, enabled, fwdLock, inps, items, learnable, m_batch, m_pattern, myLearner, notFirstTime, notFirstTimeB, outs, revLock

Constructor Summary

FahlmanTeacherSynapse()
          Creates a new instance of FahlmanTeacherSynapse

Method Summary

protected double calculateError(double aDesired, double anOutput, int anIndex)
          Calculates the error to be backpropaged for a single output neuron.

double getLowerBit()
          Gets the lower bit value.

double getLowerBitPercentage()
          Gets the lower bit percentage.

double getUpperBit()
          Gets the upper bit value.

double getUpperBitPercentage()
          Gets the upper bit percentage.

void setLowerBit(double aValue)
          Sets the lower bit.

void setLowerBitPercentage(double aValue)
          Sets the lower bit percentage.

void setUpperBit(double aValue)
          Sets the upper bit.

void setUpperBitPercentage(double aValue)
          Sets the upper bit percentage.

Methods inherited from class org.joone.engine.learning.TeacherSynapse

calculateGlobalError, fwdPut

Methods inherited from class org.joone.engine.learning.AbstractTeacherSynapse

backward, check, cicleTerminated, constructErrorPattern, epochFinished, errorChanged, forward, fwdGet, getDesired, getSeenPatterns, incSeenPatterns, init, isFirstTime, netStarted, netStopped, netStoppedError, pushError, readResolve, reset, resetInput, revGet, revPut, setArrays, setDesired, setDimensions, setFirstTime, setInputDimension, setMonitor, setSeenPatterns, stopTheNet

Methods inherited from class org.joone.engine.Synapse

addNoise, canCountSteps, getFwdLock, getIgnoreBefore, getInputDimension, getLearner, getLearningRate, getMomentum, getMonitor, getName, getOutputDimension, getRevLock, getWeights, initLearner, InspectableTitle, Inspections, isEnabled, isInputFull, isLoopBack, isOutputFull, randomize, setEnabled, setIgnoreBefore, setInputFull, setLearningRate, setLoopBack, setMomentum, setName, setOutputDimension, setOutputFull, setWeights

Methods inherited from class java.lang.Object

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

Field Detail

CRITERION

public static final java.lang.String CRITERION

Constant to indicate (key) the parameter for checking (in the monitor object) if the criterion has been forfilled or not.

See Also:: Constant Field Values

log

protected static final org.joone.log.ILogger log

Logger

upperBit

private double upperBit

The upperbit value (of the desired output), by default 1.

lowerBit

private double lowerBit

The lowerbit value (of the desired output), by default 0.

lowerBitPercentage

private double lowerBitPercentage

The percentage that is considered as a lowerbit, by default 0.4. In case of desired output bits {0, 1} any output within [0, 0.4] is considered a lower bit

upperBitPercentage

private double upperBitPercentage

The percentage that is considered as a upperbit, by default 0.4. In case of desired output bits {0, 1} any output within [0.6, 1] is considered a upper bit

Constructor Detail