Changeset 15275 for branches/PushGP/HeuristicLab.PushGP/HeuristicLab.Problems.ProgramSynthesis/Push/Generators/CodeGenerator/CodeGeneratorUtils.cs

Timestamp:

07/20/17 11:39:53 (7 years ago)

Author:

pkimmesw

Message:

#2665 Added PlushEncoding, ZeroErrorDistributionAnalzer

File:

• branches/PushGP/HeuristicLab.PushGP/HeuristicLab.Problems.ProgramSynthesis/Push/Generators/CodeGenerator/CodeGeneratorUtils.cs (modified) (1 diff)

branches/PushGP/HeuristicLab.PushGP/HeuristicLab.Problems.ProgramSynthesis/Push/Generators/CodeGenerator/CodeGeneratorUtils.cs

@@ -57 +57 @@
       var name = config.EnabledExpressions[index];
       return ExpressionTable.GetExpression(name);
+    }
+
+    public static Expression GetRandomExpression(IRandom random, IReadOnlyErcOptions ercOptions, IReadOnlyExpressionsConfiguration instructions, double inInstructionProbability) {
+      var x = random.NextDouble();
+      var inInstructionRelativeProbability = ercOptions.ErcProbability + inInstructionProbability;
+
+      Expression expression;
+
+      if (ercOptions.ErcProbability > 0 && x <= ercOptions.ErcProbability) {
+        var stackType = instructions.ExpressionsPerStackCount.RandomWeightedOrDefault(random, pair => pair.Value).Key;
+
+        expression = stackType == default(StackTypes)
+          ? GetRandomExpression(random, instructions)
+          : CreateRandomErcExpression(stackType, random, ercOptions);
+      } else if (
+        inInstructionProbability > 0 &&
+        x <= inInstructionRelativeProbability &&
+        instructions.InExpressionCount > 0) {
+
+        var nr = random.Next(0, instructions.InExpressionCount) + 1;
+        expression = ExpressionTable.InExpressionTable[nr];
+      } else {
+        expression = GetRandomExpression(random, instructions);
+      }
+
+      return expression;
+    }
+
+    private static Expression GetRandomExpression(
+      IRandom random,
+      IReadOnlyExpressionsConfiguration instructionsConfig) {
+      var index = random.Next(0, instructionsConfig.EnabledExpressions.Count);
+      var expressionName = instructionsConfig.EnabledExpressions[index];
+      var expression = ExpressionTable.GetExpression(expressionName);
+
+      return expression;
     }