// adds instruction with following tree
public void appendInstruction(uint instruction, double relativePropability, SparseArrayProgramDistributionTreeElement childrenTreeElement)
{
// ensure hard
Debug.Assert(!childrenByInstruction.ContainsKey(instruction));
childrenByInstruction[instruction] = childrenTreeElement;
tableWithPropability.append(instruction, relativePropability);
}
// \param numberOfInstructions how many instructions exist for the instructionset?
public void sample(double[] propabilityVector, ref uint[] resultInstructions, uint instructionsetCount, int lengthOfProgram, Random random)
{
// select instruction, look for a children for the node, iterate
lengthOfProgram = lengthOfProgram == -1 ? propabilityVector.Length : lengthOfProgram;
SparseArrayProgramDistributionTreeElement iterationElement = root;
// if the iteration tree element is null we choose an random instruction,
// because the tree has no preference or knowledge of the instruction distribution
for (int i = 0; i < lengthOfProgram; i++)
{
// * calculate absolute propability sum
double propabilityMassForCurrentSparseArrayProgramDistributionTreeElement = iterationElement != null?iterationElement.getPropabilityMass(instructionsetCount) : instructionsetCount;
double propabilityForInstructionByIndex = propabilityVector[i];
double absolutePropabilitySum = propabilityMassForCurrentSparseArrayProgramDistributionTreeElement * propabilityForInstructionByIndex;
uint selectedInstruction;
// * select instructions
if (iterationElement != null)
{
selectedInstruction = iterationElement.sampleInstructionBasedOnAbsolutePropability(absolutePropabilitySum, instructionsetCount, random);
}
else
{
// fast way to choose a random instruction
selectedInstruction = (uint)absolutePropabilitySum;
}
// * store instruction
resultInstructions[i] = selectedInstruction;
// * choose next tree element
if (iterationElement != null)
{
iterationElement = iterationElement.getChildrenElementByInstruction(selectedInstruction);
}
}
}
public void addProgram(uint[] instructions)
{
double defaultPropabilityOfShadowedInstruction = 1.0; // just a name for an otherwise magical value
SparseArrayProgramDistributionTreeElement treeElementForCurrentInstruction = root;
if (root == null)
{
root = new SparseArrayProgramDistributionTreeElement(defaultPropabilityOfShadowedInstruction);
treeElementForCurrentInstruction = root;
}
foreach (uint iterationInstruction in instructions)
{
if (!treeElementForCurrentInstruction.isInstructionKnown(iterationInstruction))
{
treeElementForCurrentInstruction.appendInstruction(iterationInstruction, defaultPropabilityOfShadowedInstruction, new SparseArrayProgramDistributionTreeElement(defaultPropabilityOfShadowedInstruction));
}
treeElementForCurrentInstruction = treeElementForCurrentInstruction.getChildrenElementByInstruction(iterationInstruction);
}
}
