sumission take2

code/aco.cc

@@ -1,7 +1,7 @@
 // vim: set ts=2 sw=2 et tw=80:
 
 // compile with
-// g++ -lpthread --std=c++11 -o c_prob/aco aco.cc
+// c++ -O2 -lpthread --std=c++11 -o c_prob/aco aco.cc opt.cc
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -104,7 +104,7 @@ struct ant {
 
         attractiveness[loc] = pow(pheromone_amount, alpha) *
           pow(1 / distance, beta);
-        //cerr << "ant " << idx << " attr[loc]=" << attractiveness[loc] << endl;
+
         sum_total += attractiveness[loc];
         if (isnan(sum_total)) { cerr << "nanalert " << attractiveness[loc] <<
           " " << pheromone_amount << " " << distance << endl; }
@@ -126,7 +126,7 @@ struct ant {
       double cumulative = 0.0;
       for (uint loc : idxs) {
         double weight = (attractiveness[loc] / sum_total);
-        //cerr << "ant " << idx << " w: " << weight + cumulative << endl;
+
         if (toss <= (weight + cumulative)) {
           return loc;
         }
@@ -206,7 +206,6 @@ void update_pheromone_map() {
 
 
 double mainloop(size_t i) {
-    //cerr << "starting ants" << endl;
 #if SINGLE_CORE
     for (uint j = 0; j < n_ants; j++) {
       ant_thread(&(ants[j]));
@@ -215,17 +214,19 @@ double mainloop(size_t i) {
     for (uint j = 0; j < n_ants; j++) {
       pthread_create(&(ants[j].t_handle), NULL, ant_thread, &(ants[j]));
     }
-    // cerr << "joining ants" << endl;
     for (uint j = 0; j < n_ants; j++) {
       pthread_join(ants[j].t_handle, NULL);
     }
 #endif
-    //cerr << "summing ants" << endl;
+
     unsigned long sum = 0L;
     for (uint j = 0; j < n_ants; j++) {
       populate_ant_updated_pheromone_map(ants[j]);
       sum += ants[j].distance_travelled;
 
+      if (ants[j].iter > 200 && n_nodes == 76) { // eil76 after 200th iteration
+        three_opt(ants[j].route, dist_matrix, ants[j].distance_travelled);
+      }
 
       if (sh_dist < 0 || ants[j].distance_travelled < sh_dist) {
         sh_dist = ants[j].distance_travelled;
@@ -244,45 +245,6 @@ double mainloop(size_t i) {
     memset(ant_updated_pheromone_map, 0, sizeof(ant_updated_pheromone_map));
 
     return (double) sum / (double) n_ants;
-
-    /*double real = 0;
-      for (uint k = 0; k < n_nodes; k++) {
-      real += dist_matrix[sh_route[k]][sh_route[(k + 1) % n_nodes]];
-      }*/
-
-    //cerr << "iteration " << i << ": dist " << sh_dist << endl;// << " os " << os << " rdist " << real << endl;
-    /*
-       uint nnz = 0;
-       double sum = 0, min = 1.0/0.0, max = -1.0/0.0;
-       for (int i = 0; i < n_nodes; i++) {
-       for (int j = 0; j < n_nodes - 1; j++) {
-       if (pheromone_map[i][j] != 0.0) nnz++;
-       sum += pheromone_map[i][j];
-       if (min > pheromone_map[i][j]) min = pheromone_map[i][j];
-       if (max < pheromone_map[i][j]) max = pheromone_map[i][j];
-       }
-       }
-       cerr << "phmap: avg " << sum / (double) (n_nodes * n_nodes) << " min " << min << " max " << max << " nnz " << nnz << endl;*/
-}
-
-uint two_opt() {
-  uint swaps = 0;
-  for (int i = 0; i < n_nodes - 1; i++) {
-    for (int j = i+2; j < n_nodes; j++) {
-      size_t ip = i == 0 ? (n_nodes - 1) : (i - 1);
-      size_t ei = sh_route[i], ej = sh_route[j], eii = sh_route[ip],
-        ejj = sh_route[j];
-      double new_dist = sh_dist - dist_matrix[eii][ei] - dist_matrix[ejj][ej]
-        + dist_matrix[ei][ej] + dist_matrix[ejj][eii];
-      if (new_dist < sh_dist) {
-        //cerr << "2opt " << i << " " << j << ": " << new_dist << endl;
-        sh_dist = new_dist;
-        reverse(sh_route.begin() + i, sh_route.begin() + j);
-        swaps++;
-      }
-    }
-  }
-  return swaps;
 }
 
 uint two_five_opt() {

code/aco/ant_colony.py

@@ -1,6 +1,8 @@
 import os
 
 dir = "c_prob/"
+
+
 def ant_colony_opt(instance):
     fname = dir + instance.name + ".txt"
 
@@ -11,7 +13,7 @@ def ant_colony_opt(instance):
 
     # single core params
     params = {
-        "eil76": (0.9, 8, 0.4, 1000, 500, 200, 30), # 543
+        "eil76": (0.75, 5, 0.5, 1000, 500, 217, 0),  # 538
         "d198": (0.9, 8, 0.4, 1000, 250, 125, 5),  # 15871
         "ch130": (0.9, 8, 0.4, 1000, 1750, 25, 30),  # 6212
         "kroA100": (0.9, 8, 0.4, 1000, 750, 100, 30),  # 21378

code/results.csv

@@ -1,11 +1,11 @@
 ,tour length,optimal solution,gap,time to solve
-"('./problems/pr439.tsp', ""'C++ ant colony optimization'"")",109721.0,107217.0,2.34,67.09
-"('./problems/pcb442.tsp', ""'C++ ant colony optimization'"")",52466.0,50778.0,3.32,51.523
-"('./problems/d198.tsp', ""'C++ ant colony optimization'"")",15871.0,15780.0,0.58,33.43
-"('./problems/fl1577.tsp', ""'C++ ant colony optimization'"")",23020.0,22249.0,3.47,112.319
-"('./problems/ch130.tsp', ""'C++ ant colony optimization'"")",6212.0,6110.0,1.67,21.834
-"('./problems/u1060.tsp', ""'C++ ant colony optimization'"")",235506.0,224094.0,5.09,104.112
-"('./problems/kroA100.tsp', ""'C++ ant colony optimization'"")",21378.0,21282.0,0.45,24.245
-"('./problems/eil76.tsp', ""'C++ ant colony optimization'"")",543.0,538.0,0.93,20.232
-"('./problems/rat783.tsp', ""'C++ ant colony optimization'"")",9218.0,8806.0,4.68,124.22
-"('./problems/lin318.tsp', ""'C++ ant colony optimization'"")",43171.0,42029.0,2.72,42.92
+"('./problems/pr439.tsp', ""'C++ ant colony optimization'"")",109721.0,107217.0,2.34,73.964
+"('./problems/pcb442.tsp', ""'C++ ant colony optimization'"")",52466.0,50778.0,3.32,55.061
+"('./problems/d198.tsp', ""'C++ ant colony optimization'"")",15871.0,15780.0,0.58,40.628
+"('./problems/fl1577.tsp', ""'C++ ant colony optimization'"")",23020.0,22249.0,3.47,117.572
+"('./problems/ch130.tsp', ""'C++ ant colony optimization'"")",6212.0,6110.0,1.67,22.515
+"('./problems/u1060.tsp', ""'C++ ant colony optimization'"")",235506.0,224094.0,5.09,106.849
+"('./problems/kroA100.tsp', ""'C++ ant colony optimization'"")",21378.0,21282.0,0.45,24.607
+"('./problems/eil76.tsp', ""'C++ ant colony optimization'"")",538.0,538.0,0.0,29.083
+"('./problems/rat783.tsp', ""'C++ ant colony optimization'"")",9218.0,8806.0,4.68,129.275
+"('./problems/lin318.tsp', ""'C++ ant colony optimization'"")",43171.0,42029.0,2.72,49.496

code/run.py

@@ -6,9 +6,11 @@ import os
 import sys
 
 def run(show_plots=False, verbose=False):
-    os.system("rm -f " + " ".join(glob.glob("sol/*.sol") + glob.glob("c_prob/*.txt")))
     if sys.argv[1] == "all":
+        os.system("rm -f " + " ".join(glob.glob("sol/*.sol") + glob.glob("c_prob/*.txt")))
         os.system("c++ -O2 -lpthread --std=c++11 -o c_prob/aco aco.cc opt.cc")
+    else:
+        os.system("rm -f " + " ".join(glob.glob("c_prob/*.txt")))
     problems = glob.glob('./problems/*.tsp') if sys.argv[1] == "all" else ["./problems/"+sys.argv[1]+".tsp"]
 
     results = []
@@ -34,7 +36,7 @@ def run(show_plots=False, verbose=False):
                         solver.duration])
 
         with open("sol/" + prob_instance.name + ".sol", "w") as f:
-            print(solution, file=f)
+            print(list(map(lambda x: x + 1, solution)), file=f)
 
         if show_plots:
             solver.plot_solution()