edu.memphis.ccrg.lida.framework.strategies
Class SigmoidExciteStrategy

java.lang.Object
  edu.memphis.ccrg.lida.framework.initialization.InitializableImpl
      edu.memphis.ccrg.lida.framework.strategies.StrategyImpl
          edu.memphis.ccrg.lida.framework.strategies.SigmoidExciteStrategy

All Implemented Interfaces:

Initializable, ExciteStrategy, Strategy

public class SigmoidExciteStrategy
extends StrategyImpl
implements ExciteStrategy

Default implementation of sigmoid excite. Uses two parameters in activation calculation. Can pass these parameters when the strategy is initialized. (see factoriesData.xml). Alternatively, parameters can be passed in the excite method call. Formula used: 1 / (1 + exp(-a* x + c))

Author:

Ryan J. McCall, Javier Snaider

Constructor Summary

SigmoidExciteStrategy()

Method Summary

double	excite(double currentActivation, double excitation, java.util.Map<java.lang.String,? extends java.lang.Object> params) Excites the current activation according to some internal excite function.
double	excite(double curActiv, double excitation, java.lang.Object... params) Excites the current activation according to some internal excite function.
void	init() If this method is overridden, this init() must be called first! i.e.

Methods inherited from class edu.memphis.ccrg.lida.framework.initialization.InitializableImpl

containsParameter, getParam, getParameters, init

Methods inherited from class java.lang.Object

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

Methods inherited from interface edu.memphis.ccrg.lida.framework.initialization.Initializable

containsParameter, getParam, getParameters, init

Constructor Detail

SigmoidExciteStrategy

public SigmoidExciteStrategy()

Method Detail

init

public void init()

If this method is overridden, this init() must be called first! i.e. super.init(); Will set parameters with the following names:

a slope component of the decay function's linear scaling, 1 / (1 + exp(-a* x + c))
c intercept component of the decay function's linear scaling, 1 / (1 + exp(-a* x + c))
If any parameter is not specified its default value will be used.

Specified by:

init in interface Initializable

Overrides:

init in class InitializableImpl

See Also:

Initializable

excite

public double excite(double curActiv,
                     double excitation,
                     java.lang.Object... params)

Excites the current activation according to some internal excite function.

Specified by:

excite in interface ExciteStrategy

Parameters:

curActiv - activation of the entity before excite.

excitation - amount of activation to adds

params - optionally accepts 2 double parameters of sigmoid activation calculation.

Returns:

new activation amount

excite

public double excite(double currentActivation,
                     double excitation,
                     java.util.Map<java.lang.String,? extends java.lang.Object> params)

Excites the current activation according to some internal excite function.

Specified by:

excite in interface ExciteStrategy

Parameters:

currentActivation - activation of the entity before excite.

excitation - amount of activation to adds

params - optionally accepts 2 parameters of sigmoid activation calculation.

Returns:

new activation amount