Changeset 14221 for trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding

Timestamp:

07/29/16 11:10:58 (8 years ago)

Author:

bburlacu

Message:

#2647: Addressed the issue described above by adding the [Storable] attribute to the node parent member, and cloning the swapped subtree during crossover.

Location:

trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4

Files:

• Crossovers/SubtreeCrossover.cs (modified) (1 diff)
• SymbolicExpressionTreeNode.cs (modified) (2 diffs)

trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/Crossovers/SubtreeCrossover.cs

@@ -111 +111 @@
       } else {
         var selectedBranch = SelectRandomBranch(random, allowedBranches, internalCrossoverPointProbability);
+        if (selectedBranch != null)
+          selectedBranch = (ISymbolicExpressionTreeNode)selectedBranch.Clone();
 
         if (crossoverPoint0.Child != null) {

trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/SymbolicExpressionTreeNode.cs

@@ -44 +44 @@
 
     // parent relation is not persisted or cloned (will be set on AddSubtree or RemoveSubtree)
+    [Storable]
     private ISymbolicExpressionTreeNode parent;
     public ISymbolicExpressionTreeNode Parent {
@@ -87 +88 @@
       if (subtrees != null) {
         foreach (var subtree in subtrees)
-          subtree.Parent = this;
+          if (subtree.Parent != null)
+            subtree.Parent = this;
       }
     }