lib/tasks/vns.rake

@@ -4,26 +4,47 @@ namespace :vns do
   desc 'Benchmarks the efficiency of the VNS implementation'
   task benchmark: :environment do
     ActsAsTenant.with_tenant(Wedding.first) do
-      Rails.logger.info "There are #{Guest.potential.count} potential guests"
 
-      engine = VNS::Engine.new
+      iterations = 10
 
-      engine.add_perturbation(Tables::Swap)
-      engine.add_perturbation(Tables::Shift)
+      guests = Guest.potential
+
+      Rails.logger.info "There are #{guests.count} potential guests"
+
+      time_acc = 0
+      solution_acc = 0
 
       hierarchy = AffinityGroupsHierarchy.new
-      initial_solution = Tables::Distribution.new(min_per_table: 8, max_per_table: 10, hierarchy:)
 
-      random = Random.new(561_163)
-      initial_solution.random_distribution(Guest.potential.shuffle(random:), random:)
+      iterations.times do |i|
+        engine = VNS::Engine.new
 
-      engine.initial_solution = initial_solution
+        engine.add_perturbation(Tables::Swap)
+        engine.add_perturbation(Tables::Shift)
 
-      engine.target_function(&:discomfort)
+        initial_solution = Tables::Distribution.new(min_per_table: 8, max_per_table: 10, hierarchy:)
 
-      solution = Rails.benchmark('VNS Benchmarking') { engine.run }
+        random = Random.new(i)
+        initial_solution.random_distribution(guests.shuffle(random:), random:)
 
-      Rails.logger.info "Best solution found with discomfort: #{solution.discomfort}"
+        engine.initial_solution = initial_solution
+
+        engine.target_function(&:discomfort)
+
+        start_time = Time.now
+        
+        solution = engine.run
+
+        elapsed = Time.now - start_time
+
+        time_acc += elapsed
+        solution_acc += solution.discomfort
+
+        Rails.logger.info "[#{elapsed}] Best solution found with discomfort: #{solution.discomfort}"
+      end
+
+      Rails.logger.info "Average time: #{time_acc / iterations} seconds"
+      Rails.logger.info "Average discomfort: #{solution_acc / iterations}"
     end
   end
 end