Change TSP to search closest neighbors. Make lines for plotting thinner and plot neighbor connections.

tsp/map.py

@@ -9,6 +9,7 @@ class Map(object):
 
     def __init__(self, n_clusters):
         self.CLUSTERS_X = n_clusters
+        self.plot_n = 0
 
     def calc_corners(self, points):
         x_min, x_max = float("inf"), float("-inf")
@@ -118,11 +119,15 @@ class Map(object):
         except ModuleNotFoundError:
             return
 
+        plt.figure(dpi=300)
+
         def plot_arrows():
             for i in range(len_points):
                 p1 = points[i - 1]
                 p2 = points[i]
-                plot_arrow(p1, p2)
+                plt.plot([p1.x, p2.x], [p1.y, p2.y], 'r',
+                         linewidth=0.8)
+                # plot_arrow(p1, p2)
 
         def plot_arrow(p1, p2):
             x = p1.x
@@ -130,7 +135,7 @@ class Map(object):
             dx = p2.x - x
             dy = p2.y - y
             opt = {'head_width': 0.4, 'head_length': 0.4, 'width': 0.05,
-                   'length_includes_head': True}
+                   'linewidth': 0.4, 'length_includes_head': True}
             plt.arrow(x, y, dx, dy, **opt)
 
         def plot_points():
@@ -138,11 +143,19 @@ class Map(object):
                 plt.plot(p.x, p.y, '')
                 # plt.text(p.x, p.y, '  ' + str(p))
                 for nb, _ in p.neighbors:
-                    # plt.plot([p.x, nb.x], [p.y, nb.y], 'r--')
-                    pass
+                    plt.plot([p.x, nb.x], [p.y, nb.y], 'b--',
+                             linewidth=0.2)
 
         len_points = len(points)
-        plot_points()
-        self.plot_grid(plt)
         plot_arrows()
-        plt.show()
+        plot_points()
+        try:
+            self.plot_grid(plt)
+        except AttributeError:
+            pass
+
+        plt.axis('off')
+        fig_file = "plots/step_{}.png".format(self.plot_n)
+        plt.savefig(fig_file, bbox_inches='tight')
+        self.plot_n += 1
+

tsp/tsp.py

@@ -174,9 +174,9 @@ def local_search_k_opt(route, goal, m):
                 no_improvement_iterations = 0
 
         no_improvement_iterations += 1
-        if no_improvement_iterations > 10:
+        if no_improvement_iterations > 3:
             break
-            # print("[random k-opt] current_total={}".format(current_total))
+            print("[random k-opt] current_total={}".format(current_total))
             while True:
                 point = choice(route.points)
                 try:
@@ -189,7 +189,7 @@ def local_search_k_opt(route, goal, m):
 
         if current_total < goal:
             return
-#
+
 
 class Route(object):
     def __init__(self, points):
@@ -322,6 +322,13 @@ class Route(object):
         for i, p in enumerate(self.points):
             p.index = i
 
+    def calculate_neighbors(self, n=3):
+        for p in self.points:
+            def d(other_point):
+                return distance(p, other_point)
+            ps = sorted(self.points, key=d)[1:n + 1]
+            p.add_neighbors(ps)
+
 
 def solve_tsp(points):
     r = Route(points)
@@ -334,9 +341,6 @@ def solve_tsp(points):
 
 def solve_it(input_data):
     r = Route(parse_input_data(input_data))
-    m = ClusterMap(4)
-    m.cluster(r.points)
-
     goal = {51: 429, # 4
             100: 20800, # 4
             200: 30000, # 8
@@ -345,16 +349,18 @@ def solve_it(input_data):
             1889: 378069,
             33810: 78478868,
             }[r.len_points]
+    m = ClusterMap(4)
+    r.calculate_neighbors(8)
+    # m.cluster(r.points)
+    # r.route_from_clusters(m)
 
-    r.route_from_clusters(m)
     local_search_k_opt(r, goal, m)
     m.plot(r.points, plt)
-
     r.verify_total_distance()
     return prepare_output_data(r.points)
 
 
-def solve_it_(input_data):
+def solve_it_precomputed(input_data):
     r = Route(parse_input_data(input_data))
     n = len(r.points)
     if n == 51:
@@ -379,9 +385,9 @@ def solve_it_(input_data):
 if __name__ == "__main__":
     # file_location = "data/tsp_6_1"
     file_location = "data/tsp_51_1"
-    # file_location = "data/tsp_100_3"
-    # file_location = "data/tsp_200_2"
-    # file_location = "data/tsp_574_1"
+    file_location = "data/tsp_100_3"
+    file_location = "data/tsp_200_2"
+    file_location = "data/tsp_574_1"
     # file_location = "data/tsp_1889_1"
     # file_location = "data/tsp_33810_1"
     with open(file_location, 'r') as input_data_file: