Changeset 12922 for branches/HeuristicLab.Algorithms.IteratedSentenceConstruction/HeuristicLab.Algorithms.IteratedSymbolicExpressionConstruction/3.3/Policies/SymbolicExpressionConstructionPolicyBase.cs

Timestamp:

08/27/15 16:55:07 (9 years ago)

Author:

gkronber

Message:

#2471

• added a simple implementation of Koza-style symbolic regression
• added ucb tuned and estimation of variance to tabular quality functions

File:

• branches/HeuristicLab.Algorithms.IteratedSentenceConstruction/HeuristicLab.Algorithms.IteratedSymbolicExpressionConstruction/3.3/Policies/SymbolicExpressionConstructionPolicyBase.cs (modified) (3 diffs)

branches/HeuristicLab.Algorithms.IteratedSentenceConstruction/HeuristicLab.Algorithms.IteratedSymbolicExpressionConstruction/3.3/Policies/SymbolicExpressionConstructionPolicyBase.cs

@@ -46 +46 @@
 
     protected SymbolicExpressionConstructionPolicyBase() {
+
     }
 
@@ -106 +107 @@
         // and add child node to parent
         var childNode = alts[selectedIdx].CreateTreeNode();
-        if (childNode.HasLocalParameters) childNode.ResetLocalParameters(Random);
+        if (childNode.HasLocalParameters) {
+          throw new NotSupportedException("Symbols with parameters are not supported by construction policies for symbolic expressions. Try to reformulate the problem so that only discrete actions are necessary");
+          // childNode.ResetLocalParameters(Random);
+        }
 
         Contract.Assert(parent.SubtreeCount == childIdx);
@@ -113 +117 @@
 
         // push new slots 
-        for (int chIdx = childNode.Symbol.MinimumArity - 1; chIdx >= 0; chIdx--) {
+        for (int chIdx = g.GetMinimumSubtreeCount(childNode.Symbol) - 1; chIdx >= 0; chIdx--) {
           int minForChild = g.GetAllowedChildSymbols(childNode.Symbol, chIdx).Min(a => g.GetMinimumExpressionLength(a)); // min length of all possible alts for the slot
           openSlots.Push(new Slot() { parent = childNode, childIdx = chIdx, minSize = minForChild });