public void StepFunction_Test()
{
Assert.AreEqual(0, ActivationFunctionHelper.StepFunction(0));
Assert.AreEqual(0, ActivationFunctionHelper.StepFunction(0));
Assert.AreEqual(1, ActivationFunctionHelper.StepFunction(2));
Assert.AreEqual(1, ActivationFunctionHelper.StepFunction(0.1));
}
public void ActivationFunction_Test()
{
Assert.AreEqual(0.5, ActivationFunctionHelper.ActivationFunction(ActivationFunctionHelper.Function.SIGMOID, 0));
Assert.AreEqual(0.731, ActivationFunctionHelper.ActivationFunction(ActivationFunctionHelper.Function.SIGMOID, 1), 0.0005);
Assert.AreEqual(0.2689, ActivationFunctionHelper.ActivationFunction(ActivationFunctionHelper.Function.SIGMOID, -1), 0.0005);
Assert.AreEqual(0, ActivationFunctionHelper.ActivationFunction(ActivationFunctionHelper.Function.STEP_FUNC, 0));
Assert.AreEqual(0, ActivationFunctionHelper.ActivationFunction(ActivationFunctionHelper.Function.STEP_FUNC, 0));
Assert.AreEqual(1, ActivationFunctionHelper.ActivationFunction(ActivationFunctionHelper.Function.STEP_FUNC, 2));
Assert.AreEqual(1, ActivationFunctionHelper.ActivationFunction(ActivationFunctionHelper.Function.STEP_FUNC, 0.1));
}
public double CalculateValue(Dictionary <int, NodeGene> nodes, Stack <int> visitedNodes)
{
//Check if the node is in the stack, if so return the last value
if (visitedNodes.Contains(_id))
{
return(_lastVal);
}
//If value already calculated return the value
if (_currentValCalculatedFlag)
{
return(_currentVal);
}
//Add the node to the stack
visitedNodes.Push(_id);
//Node is calculated the first time
_lastVal = _currentVal;
_currentVal = 0;
foreach (ConnectionGene connection in _inputs)
{
//Add only active connections
if (connection.Expressed)
{
//Recursive call of calculate value
_currentVal += connection.Weight * nodes[connection.InNode].CalculateValue(nodes, visitedNodes);
}
}
_currentVal = ActivationFunctionHelper.ActivationFunction(_typeOfFunction, _currentVal);
_currentValCalculatedFlag = true;
//Check if the removed node is really the correct node
int poppedNode = visitedNodes.Pop();
if (poppedNode != _id)
{
throw new System.Exception("The popped node does not match the id! PoppedNode: " + poppedNode + ", ID: " + _id);
}
return(_currentVal);
}
public void SigmoidFunction_Test()
{
Assert.AreEqual(0.5, ActivationFunctionHelper.SigmoidFunction(0));
Assert.AreEqual(0.731, ActivationFunctionHelper.SigmoidFunction(1), 0.0005);
Assert.AreEqual(0.2689, ActivationFunctionHelper.SigmoidFunction(-1), 0.0005);
}
