Changeset 11667 for branches/Parameter-less Population Pyramid/HeuristicLab.Algorithms.ParameterlessPopulationPyramid/3.3/LinkageCrossover.cs

Timestamp:

12/06/14 16:58:02 (9 years ago)

Author:

bgoldman

Message:

#2282 Major bug fixes, now gets answers close to correct.

File:

• branches/Parameter-less Population Pyramid/HeuristicLab.Algorithms.ParameterlessPopulationPyramid/3.3/LinkageCrossover.cs (modified) (1 diff)

branches/Parameter-less Population Pyramid/HeuristicLab.Algorithms.ParameterlessPopulationPyramid/3.3/LinkageCrossover.cs

@@ -57 +57 @@
       if (changed) {
         double newFitness = problem.Evaluate(solution);
-        if (problem.IsBetter(newFitness, fitness)) {
-          // improvement made, keep change to solution
-          fitness = newFitness;
-        } else {
-          // revert solution
+        // if the original is strictly better, revert the change
+        if (problem.IsBetter(fitness, newFitness)) {
           foreach (var index in flipped) {
             solution[index] = !solution[index];
           }
+        } else {
+          // new solution is no worse than original, keep change to solution
+          fitness = newFitness;
         }
       }