/// <summary>
/// Creates the instance of the activation function.
/// </summary>
/// <param name="cfg">The configuration.</param>
/// <param name="rand">A random object to be used for randomly generated parameters.</param>
public static IActivation CreateAF(IActivationSettings cfg, Random rand)
{
IActivation af;
Type settingsType = cfg.GetType();
if (settingsType == typeof(AFSpikingAdExpIFSettings))
{
AFSpikingAdExpIFSettings afs = (AFSpikingAdExpIFSettings)cfg;
af = new AFSpikingAdExpIF(rand.NextDouble(afs.TimeScale),
rand.NextDouble(afs.Resistance),
rand.NextDouble(afs.RestV),
rand.NextDouble(afs.ResetV),
rand.NextDouble(afs.RheobaseV),
rand.NextDouble(afs.FiringThresholdV),
rand.NextDouble(afs.SharpnessDeltaT),
rand.NextDouble(afs.AdaptationVoltageCoupling),
rand.NextDouble(afs.AdaptationTimeConstant),
rand.NextDouble(afs.AdaptationSpikeTriggeredIncrement),
afs.SolverMethod,
afs.SolverCompSteps,
afs.StimuliDuration,
rand.NextRangedUniformDouble(MinInitialVRatio, MaxInitialVRatio)
);
}
else if (settingsType == typeof(AFAnalogBentIdentitySettings))
{
af = new AFAnalogBentIdentity();
}
else if (settingsType == typeof(AFAnalogElliotSettings))
{
AFAnalogElliotSettings afs = (AFAnalogElliotSettings)cfg;
af = new AFAnalogElliot(rand.NextDouble(afs.Slope));
}
else if (settingsType == typeof(AFSpikingExpIFSettings))
{
AFSpikingExpIFSettings afs = (AFSpikingExpIFSettings)cfg;
af = new AFSpikingExpIF(rand.NextDouble(afs.TimeScale),
rand.NextDouble(afs.Resistance),
rand.NextDouble(afs.RestV),
rand.NextDouble(afs.ResetV),
rand.NextDouble(afs.RheobaseV),
rand.NextDouble(afs.FiringThresholdV),
rand.NextDouble(afs.SharpnessDeltaT),
afs.RefractoryPeriods,
afs.SolverMethod,
afs.SolverCompSteps,
afs.StimuliDuration,
rand.NextRangedUniformDouble(MinInitialVRatio, MaxInitialVRatio)
);
}
else if (settingsType == typeof(AFAnalogGaussianSettings))
{
af = new AFAnalogGaussian();
}
else if (settingsType == typeof(AFAnalogIdentitySettings))
{
af = new AFAnalogIdentity();
}
else if (settingsType == typeof(AFAnalogISRUSettings))
{
AFAnalogISRUSettings afs = (AFAnalogISRUSettings)cfg;
af = new AFAnalogISRU(rand.NextDouble(afs.Alpha));
}
else if (settingsType == typeof(AFSpikingIzhikevichIFSettings))
{
AFSpikingIzhikevichIFSettings afs = (AFSpikingIzhikevichIFSettings)cfg;
af = new AFSpikingIzhikevichIF(rand.NextDouble(afs.RecoveryTimeScale),
rand.NextDouble(afs.RecoverySensitivity),
rand.NextDouble(afs.RecoveryReset),
rand.NextDouble(afs.RestV),
rand.NextDouble(afs.ResetV),
rand.NextDouble(afs.FiringThresholdV),
afs.RefractoryPeriods,
afs.SolverMethod,
afs.SolverCompSteps,
afs.StimuliDuration,
rand.NextRangedUniformDouble(MinInitialVRatio, MaxInitialVRatio)
);
}
else if (settingsType == typeof(AFSpikingAutoIzhikevichIFSettings))
{
double randomValue = rand.NextDouble().Power(2);
AFSpikingAutoIzhikevichIFSettings afs = (AFSpikingAutoIzhikevichIFSettings)cfg;
//Ranges
af = new AFSpikingIzhikevichIF(0.02,
0.2,
8 + (-6 * randomValue),
-70,
-65 + (15 * randomValue),
30,
afs.RefractoryPeriods,
afs.SolverMethod,
afs.SolverCompSteps,
afs.StimuliDuration,
rand.NextRangedUniformDouble(MinInitialVRatio, MaxInitialVRatio)
);
}
else if (settingsType == typeof(AFSpikingLeakyIFSettings))
{
AFSpikingLeakyIFSettings afs = (AFSpikingLeakyIFSettings)cfg;
af = new AFSpikingLeakyIF(rand.NextDouble(afs.TimeScale),
rand.NextDouble(afs.Resistance),
rand.NextDouble(afs.RestV),
rand.NextDouble(afs.ResetV),
rand.NextDouble(afs.FiringThresholdV),
afs.RefractoryPeriods,
afs.SolverMethod,
afs.SolverCompSteps,
afs.StimuliDuration,
rand.NextRangedUniformDouble(MinInitialVRatio, MaxInitialVRatio)
);
}
else if (settingsType == typeof(AFAnalogLeakyReLUSettings))
{
AFAnalogLeakyReLUSettings afs = (AFAnalogLeakyReLUSettings)cfg;
af = new AFAnalogLeakyReLU(rand.NextDouble(afs.NegSlope));
}
else if (settingsType == typeof(AFAnalogSigmoidSettings))
{
af = new AFAnalogSigmoid();
}
else if (settingsType == typeof(AFSpikingSimpleIFSettings))
{
AFSpikingSimpleIFSettings afs = (AFSpikingSimpleIFSettings)cfg;
af = new AFSpikingSimpleIF(rand.NextDouble(afs.Resistance),
rand.NextDouble(afs.DecayRate),
rand.NextDouble(afs.ResetV),
rand.NextDouble(afs.FiringThresholdV),
afs.RefractoryPeriods,
rand.NextRangedUniformDouble(MinInitialVRatio, MaxInitialVRatio)
);
}
else if (settingsType == typeof(AFAnalogSincSettings))
{
af = new AFAnalogSinc();
}
else if (settingsType == typeof(AFAnalogSinusoidSettings))
{
af = new AFAnalogSinusoid();
}
else if (settingsType == typeof(AFAnalogSoftExponentialSettings))
{
AFAnalogSoftExponentialSettings afs = (AFAnalogSoftExponentialSettings)cfg;
af = new AFAnalogSoftExponential(rand.NextDouble(afs.Alpha));
}
else if (settingsType == typeof(AFAnalogSoftMaxSettings))
{
af = new AFAnalogSoftMax();
}
else if (settingsType == typeof(AFAnalogSoftPlusSettings))
{
af = new AFAnalogSoftPlus();
}
else if (settingsType == typeof(AFAnalogSQNLSettings))
{
af = new AFAnalogSQNL();
}
else if (settingsType == typeof(AFAnalogTanHSettings))
{
af = new AFAnalogTanH();
}
else
{
throw new ArgumentException($"Unsupported activation function configuration: {settingsType.Name}");
}
return(af);
}
