update

run.py

@@ -5,21 +5,24 @@ import os
 def run(show_plots=False):
     # names = [name_ for name_ in os.listdir("./problems") if "tsp" in name_]
     names = ["ch130.tsp"]
+
     for name in names:
         print("\n\n#############################")
         filename = f"problems/{name}"
         instance = Instance(filename)
         instance.print_info()
-
-        solver = Solver_TSP('random')
-        solver(instance, return_value=False)
-
-        print(f"the total length for the solution found is {solver.evaluate_solution()}",
-              f"while the optimal length is {instance.best_sol}",
-              f"the gap is {solver.gap} %", sep="\n")
         if show_plots:
             instance.plot_data()
-            solver.plot_solution()
+
+        for method in ["random", "nearest_neighbors"]:
+            solver = Solver_TSP(method)
+            solver(instance, return_value=False)
+
+            print(f"the total length for the solution found is {solver.found_length}",
+                  f"while the optimal length is {instance.best_sol}",
+                  f"the gap is {solver.gap} %", sep="\n")
+            if show_plots:
+                solver.plot_solution()
 
 
 if __name__ == '__main__':

src/TSP_solver.py

@@ -17,11 +17,13 @@ class Solver_TSP:
     def __call__(self, instance_, verbose=True, return_value=True):
         self.instance = instance_
         if verbose:
-            print("###  solving ####")
+            print(f"###  solving with {self.method}####")
         self.solution = self.available_methods[self.method](instance_)
         assert self.check_if_solution_is_valid(self.solution), "Error the solution is not valid"
+        self.evaluate_solution()
+        self._gap()
         if verbose:
-            print("###  solution found ####")
+            print(f"###  solution found with {self.gap} ####")
         self._gap()
         if return_value:
             return self.solution
@@ -50,7 +52,7 @@ class Solver_TSP:
     def plot_solution(self):
         assert self.solved, "You can't plot the solution, you need to solve it first!"
         plt.figure(figsize=(8, 8))
-        plt.title(self.instance.name)
+        plt.title(f"{self.instance.name} with gap {self.gap}")
         ordered_points = self.instance.points[self.solution]
         plt.plot(ordered_points[:, 1], ordered_points[:, 2], 'b-')
         plt.show()
@@ -68,7 +70,7 @@ class Solver_TSP:
         else:
             return 0
 
-    def evaluate_solution(self, return_value=True):
+    def evaluate_solution(self, return_value=False):
         total_length = 0
         starting_node = self.solution[0]
         from_node = starting_node