New default parameters for TS (algorithm tuning)

Graph.cpp

@@ -567,14 +567,7 @@ void Graph::travellingSalesmanTabuSearchEngine(Graph &graph, unsigned tabuSteps,
                         continue;
 
 
-                    if(nextRouteLength == -1)
-                    {
-                        nextRouteLength = neighbourRouteLength;
-                        nextRoute = neighbourRoute;
-                        nextTabu.at(1) = i;
-                        nextTabu.at(2) = j;
-                    }
-                    else if(nextRouteLength > neighbourRouteLength)
+                    if(nextRouteLength == -1 || nextRouteLength > neighbourRouteLength)
                     {
                         nextRouteLength = neighbourRouteLength;
                         nextRoute = neighbourRoute;
@@ -676,17 +669,29 @@ void Graph::travellingSalesmanTabuSearchEngine(Graph &graph, unsigned tabuSteps,
             }
             else
             {
-                // W innym przypadku wlasciwa dywersyfikacja przez wygenerowanie nowego
-                // rozwiazania startowego algorytmem hybrydowym losowo-zachlannym
-                currentRoute = Graph::travellingSalesmanHybrid(graph);
-                currentTabuSteps = tabuSteps;
-                intensification = false;
-
                 // Synchronizacja globalnie najlepszej trasy (2)
                 globalOptimumMutex.lock();
                 optimalRouteLength = globalOptimumLength;
                 optimalRoute = globalOptimum;
                 globalOptimumMutex.unlock();
+
+                // W innym przypadku wlasciwa dywersyfikacja przez wygenerowanie nowego
+                // rozwiazania startowego algorytmem hybrydowym losowo-zachlannym
+                // (ale nie znacznie gorszego niz juz znalezione)
+                int criticalLength = (15 * optimalRouteLength) / 10;
+                int currentRouteLength;
+
+                do
+                {
+                    currentRoute = Graph::travellingSalesmanHybrid(graph);
+                    currentRouteLength = 0;
+
+                    for(int i = 1; i < currentRoute.size(); i++)
+                        currentRouteLength += graph.getWeight(currentRoute.at(i - 1), currentRoute.at(i));
+                } while(currentRouteLength > criticalLength);
+
+                currentTabuSteps = tabuSteps;
+                intensification = false;
             }
         }
 

pea2plus.cpp

@@ -31,7 +31,7 @@ unsigned tabuLength = 0;
 // Domyslny stan dywersyfikacji
 bool tabuDiversification = true;
 // Domyslne kryterium dywersyfikacji, liczba iteracji bez poprawy
-int tabuIterationsToRestart = 10000;
+int tabuIterationsToRestart = 5000;
 // Domyslny czas zatrzymania algorytmu tabu search [s]
 unsigned tabuStopTime = 60;
 
@@ -206,7 +206,7 @@ unsigned autoTabuLength(Graph &graph)
 {
     unsigned computedTabuLength;
 
-    computedTabuLength = (2 * graph.getVertexNumber() / 10) * 10;
+    computedTabuLength = 10 + (graph.getVertexNumber() / 10) * 10;
     if(computedTabuLength == 0)
         computedTabuLength = 10;
 
@@ -439,6 +439,7 @@ int main(int argc, char *argv[])
                         // Wyswietlenie trasy
                         unsigned distFromStart = 0;
                         unsigned length = 0;
+                        cout << endl;
                         cout << route.at(0) << '\t' << length << '\t' << distFromStart << endl;
                         for(int i = 1; i < route.size(); i++)
                         {
@@ -448,7 +449,6 @@ int main(int argc, char *argv[])
                             cout << route.at(i) << '\t' << length << '\t' << distFromStart << endl;
                         }
 
-                        cout << endl;
                         cout << "Dlugosc trasy: " << distFromStart << endl;
                         cout << endl;
                         cout << "Czas wykonania algorytmu [s]: " << clock.read() << endl;