public bool Operate(Semantics resultSemantics, Individual individual, ISemanticSubTreePool subTreePool,
int maxTreeDepth, out bool triedBackPropagation)
{
SyntaxTree tree = (SyntaxTree)individual.SyntaxTree.DeepClone();
TreeNode exchangeNode = tree.GetRandomNode();
Type nodeType = exchangeNode.Type;
TreeNode root;
if (exchangeNode.IsBackPropagable(out root))
{
triedBackPropagation = true;
var desiredSemantics = DoSemanticBackPropagation(resultSemantics, exchangeNode, root);
TreeNode newNode = DoLibrarySearch(individual, subTreePool, nodeType, desiredSemantics);
if (newNode != null)
{
bool replaced = tree.ReplaceTreeNode(exchangeNode, newNode);
if (replaced && tree.Height <= maxTreeDepth)
{
individual.SyntaxTree = tree;
return(true);
}
return(false);
}
}
triedBackPropagation = false;
return(false);
}
public ApproximateGeometricMutator(ISemanticSubTreePool subTreePool, int maxTreeDepth)
{
SubTreePool = subTreePool;
MaxTreeDepth = MaxTreeDepth;
}
protected virtual TreeNode DoLibrarySearch(Individual individual, ISemanticSubTreePool subTreePool,
Type nodeType, CombinatorialSemantics desiredSemantics)
{
return(subTreePool.GetBySemantics(nodeType, desiredSemantics));
}
public ApproximateGeometricCrossover(ISemanticSubTreePool subTreePool, int maxTreeDepth)
{
SubTreePool = subTreePool;
MaxTreeDepth = maxTreeDepth;
}
