예제 #1
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        public void TestShift1and3()
        {
            // create the problem and make sure 0->1->2->3->4 is the solution.
            var objective = new TSPTWObjective();
            var problem   = TSPTWHelper.CreateDirectedTSPTW(0, 0, 5, 10, 1);

            problem.Windows[2] = new TimeWindow()
            {
                Min = 1,
                Max = 3
            };

            // create a route with one shift.
            var route = new Optimization.Tours.Tour(new int[] { 0, 5, 8, 12, 17 }, 0);

            // apply the operator this should shift 5 to 4.
            var localSearch = new Local1ShiftTurn();
            var delta       = 0.0f;

            Assert.IsTrue(localSearch.Apply(problem, objective, route, out delta));
            Assert.AreEqual(2, delta);
            Assert.AreEqual(new int[] { 0, 4, 8, 12, 17 }, route.ToArray());

            // apply the operator again, this should shift 17 to 16.
            Assert.IsTrue(localSearch.Apply(problem, objective, route, out delta));
            Assert.AreEqual(2, delta);
            Assert.AreEqual(new int[] { 0, 4, 8, 12, 16 }, route.ToArray());
        }
예제 #2
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        public void Test1MovePossible()
        {
            // create the problem and make sure 0->1->2->3->4 is the solution.
            var objective = new TSPTWObjective();
            var problem   = TSPTWHelper.CreateTSPTW(0, 0, 5, 10);

            problem.Times[0][1] = 1;
            problem.Times[1][2] = 1;
            problem.Times[2][3] = 1;
            problem.Times[3][4] = 1;
            problem.Times[4][0] = 1;

            problem.Times[3][1] = 100;

            var route = new Optimization.Tours.Tour(new int[] { 0, 3, 2, 1, 4 }, 0);

            var localSearch = new Local2Opt();
            var delta       = 0.0f;

            Assert.IsTrue(localSearch.Apply(problem, objective, route, out delta));

            // test result.
            Assert.AreEqual(36, delta);
            Assert.AreEqual(new int[] { 0, 1, 2, 3, 4 }, route.ToArray());
        }
예제 #3
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        public void Test1MoveImpossible()
        {
            // create the problem and make sure 0->1->2->3->4 is the solution.
            var objective = new TSPTWObjective();
            var problem   = TSPTWHelper.CreateTSPTW(0, 0, 5, 10);

            problem.Times[0][1] = 1;
            problem.Times[0][3] = 2;
            problem.Times[1][2] = 1;
            problem.Times[2][3] = 1;
            problem.Times[3][4] = 1;
            problem.Times[4][0] = 1;

            problem.Times[3][1] = 100;
            problem.Windows[3]  = new TimeWindow()
            {
                Min = 1,
                Max = 2
            };
            problem.Windows[2] = new TimeWindow()
            {
                Min = 11,
                Max = 12
            };

            var route = new Optimization.Tours.Tour(new int[] { 0, 3, 2, 1, 4 }, 0);

            var localSearch = new Local2Opt();
            var delta       = 0.0f;

            Assert.IsFalse(localSearch.Apply(problem, objective, route, out delta));
        }
예제 #4
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        public void Test1MoveImpossible()
        {
            // create the problem and make sure 0->1->2->3->4 is the solution.
            var objective = new TSPTWObjective();
            var problem   = TSPTWHelper.CreateDirectedTSPTW(0, 0, 5, 10, 1);

            problem.Times.SetWeight(0, 1, 1);
            problem.Times.SetWeight(0, 3, 2);
            problem.Times.SetWeight(1, 2, 1);
            problem.Times.SetWeight(2, 3, 1);
            problem.Times.SetWeight(3, 4, 1);
            problem.Times.SetWeight(4, 0, 1);

            problem.Times.SetWeight(3, 1, 100);
            problem.Windows[3] = new TimeWindow()
            {
                Min = 1,
                Max = 2
            };
            problem.Windows[2] = new TimeWindow()
            {
                Min = 11,
                Max = 12
            };

            var route = new Optimization.Tours.Tour(new int[] { 0, 13, 9, 4, 16 }, 0);

            var localSearch = new Local2Opt();
            var delta       = 0.0f;

            Assert.IsFalse(localSearch.Apply(problem, objective, route, out delta));
        }
예제 #5
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        public void Test1MovePossible()
        {
            // create the problem and make sure 0->1->2->3->4 is the solution.
            var objective = new TSPTWObjective();
            var problem   = TSPTWHelper.CreateDirectedTSPTW(0, 0, 5, 10, 1);

            problem.Times.SetWeight(0, 1, 1);
            problem.Times.SetWeight(1, 2, 1);
            problem.Times.SetWeight(2, 3, 1);
            problem.Times.SetWeight(3, 4, 1);
            problem.Times.SetWeight(4, 0, 1);

            problem.Times.SetWeight(3, 1, 100);

            var route = new Optimization.Tours.Tour(new int[] { 0, 13, 9, 5, 17 }, 0);

            var localSearch = new Local2Opt();
            var delta       = 0.0f;

            Assert.IsTrue(localSearch.Apply(problem, objective, route, out delta));

            // test result.
            Assert.AreEqual(42, delta);
            Assert.AreEqual(new int[] { 0, 4, 8, 12, 17 }, route.ToArray());
        }
예제 #6
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        public void TestPerturbationSomeViolations()
        {
            // set the seed manually.
            RandomGeneratorExtensions.GetGetNewRandom = () => new RandomGenerator(4541247);

            // create the perturber.
            var perturber = new Random1Shift <TSPTWObjective>();

            // create a problem where any move would violate windows.
            var problem = TSPTWHelper.CreateDirectedTSPTW(0, 0, 5, 2, 1);

            problem.Windows[2] = new TimeWindow()
            {
                Min = 4,
                Max = 5
            };
            problem.Windows[3] = new TimeWindow()
            {
                Min = 6,
                Max = 7
            };
            var objective = new TSPTWObjective();

            // execute random shifts.
            for (int i = 0; i < 1000; i++)
            {
                // create solution.
                var solution      = new Optimization.Tours.Tour(new int[] { 0, 4, 8, 12, 16 });
                var fitnessBefore = objective.Calculate(problem, solution);

                // shift one customer.
                float difference;
                perturber.Apply(problem, objective, solution, out difference);

                // check if valid solution.
                var solutionList = new List <int>();
                foreach (var directed in solution)
                {
                    solutionList.Add(DirectedHelper.ExtractId(directed));
                }
                Assert.AreEqual(0, solutionList[0]);
                Assert.IsTrue(solutionList.Remove(0));
                Assert.IsTrue(solutionList.Remove(1));
                Assert.IsTrue(solutionList.Remove(2));
                Assert.IsTrue(solutionList.Remove(3));
                Assert.IsTrue(solutionList.Remove(4));
                Assert.AreEqual(0, solutionList.Count);

                // test if first is still first.
                Assert.AreEqual(problem.First, solution.First);

                // calculate expected difference.
                var fitnessAfter = objective.Calculate(problem, solution);

                Assert.AreEqual(fitnessAfter - fitnessBefore, difference, 0.0000001);
            }
        }
예제 #7
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        public void TestSolution5ClosedFixed()
        {
            // create problem.
            var problem = TSPTWHelper.CreateDirectedTSPTW(0, 4, 5, 10, 1);

            problem.Times.SetWeight(0, 1, 2);
            problem.Times.SetWeight(1, 2, 2);
            problem.Times.SetWeight(2, 3, 2);
            problem.Times.SetWeight(3, 4, 2);
            problem.Times.SetWeight(4, 0, 2);
            problem.Windows[2] = new TimeWindow()
            {
                Min = 3,
                Max = 5
            };
            problem.Windows[4] = new TimeWindow()
            {
                Min = 7,
                Max = 9
            };
            var objective = new TSPTWObjective();

            // create the solver.
            var solver = new VNSSolver();

            for (int i = 0; i < 10; i++)
            {
                // generate solution.
                float fitness;
                var   solution = solver.Solve(problem, objective, out fitness);

                // test contents.
                Assert.IsTrue(fitness <= 12);
                var solutionList = new List <int>();
                foreach (var directed in solution)
                {
                    solutionList.Add(DirectedHelper.ExtractId(directed));
                }
                Assert.AreEqual(5, solutionList.Count);
                Assert.AreEqual(0, solutionList[0]);
                Assert.AreEqual(4, solutionList[4]);
            }
        }
예제 #8
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        public void TestSolution5ClosedNotFixed()
        {
            // create problem.
            var problem = TSPTWHelper.CreateTSPTW(0, 0, 5, 10);

            problem.Times[0][1] = 2;
            problem.Times[1][2] = 2;
            problem.Times[2][3] = 2;
            problem.Times[3][4] = 2;
            problem.Times[4][0] = 2;
            problem.Windows[2]  = new TimeWindow()
            {
                Min = 3,
                Max = 5
            };
            problem.Windows[4] = new TimeWindow()
            {
                Min = 7,
                Max = 9
            };
            var objective = new TSPTWObjective();

            // create the solver.
            var solver = new VNSSolver();

            for (int i = 0; i < 10; i++)
            {
                // generate solution.
                float fitness;
                var   solution = solver.Solve(problem, objective, out fitness);

                // test contents.
                Assert.AreEqual(10, fitness);
                var solutionList = new List <int>(solution);
                Assert.AreEqual(0, solutionList[0]);
                Assert.IsTrue(solutionList.Remove(0));
                Assert.IsTrue(solutionList.Remove(1));
                Assert.IsTrue(solutionList.Remove(2));
                Assert.IsTrue(solutionList.Remove(3));
                Assert.IsTrue(solutionList.Remove(4));
                Assert.AreEqual(0, solutionList.Count);
            }
        }
예제 #9
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        public void TestPerturbation()
        {
            // set the seed manually.
            RandomGeneratorExtensions.GetGetNewRandom = () => new RandomGenerator(4541247);

            // create the perturber.
            var perturber = new Random1Shift <TSPTWObjective>();

            // create a problem.
            var problem   = TSPTWHelper.CreateTSPTW(0, 0, 5, 10);
            var objective = new TSPTWObjective();

            // execute random shifts.
            for (int i = 0; i < 1000; i++)
            {
                // create solution.
                var solution      = new Optimization.Tours.Tour(new int[] { 0, 1, 2, 3, 4 });
                var fitnessBefore = objective.Calculate(problem, solution);

                // shift one customer.
                float difference;
                perturber.Apply(problem, objective, solution, out difference);

                // check if valid solution.
                var solutionList = new List <int>(solution);
                Assert.AreEqual(0, solutionList[0]);
                Assert.IsTrue(solutionList.Remove(0));
                Assert.IsTrue(solutionList.Remove(1));
                Assert.IsTrue(solutionList.Remove(2));
                Assert.IsTrue(solutionList.Remove(3));
                Assert.IsTrue(solutionList.Remove(4));
                Assert.AreEqual(0, solutionList.Count);

                // test if first is still first.
                Assert.AreEqual(problem.First, solution.First);

                // calculate expected difference.
                var fitnessAfter = objective.Calculate(problem, solution);

                Assert.AreEqual(fitnessAfter - fitnessBefore, difference, 0.0000001);
            }
        }
예제 #10
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        public void TestSolution1()
        {
            // create problem.
            var problem   = TSPTWHelper.CreateDirectedTSPTW(0, 0, 1, 0, 1);
            var objective = new TSPTWObjective();

            // create the solver.
            var solver = new VNSSolver();

            for (int i = 0; i < 10; i++)
            {
                // generate solution.
                float fitness;
                var   solution = solver.Solve(problem, objective, out fitness);

                // test contents.
                Assert.IsTrue(fitness < 2);
                var solutionList = new List <int>(solution);
                Assert.AreEqual(0, DirectedHelper.ExtractId(solutionList[0]));
            }
        }
예제 #11
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        public void TestSolution1()
        {
            // create problem.
            var problem   = TSPTWHelper.CreateTSPTW(0, 0, 1, 0);
            var objective = new TSPTWObjective();

            // create the solver.
            var solver = new VNSSolver();

            for (int i = 0; i < 10; i++)
            {
                // generate solution.
                float fitness;
                var   solution = solver.Solve(problem, objective, out fitness);

                // test contents.
                Assert.AreEqual(0, fitness);
                var solutionList = new List <int>(solution);
                Assert.AreEqual(0, solutionList[0]);
                Assert.IsTrue(solutionList.Remove(0));
                Assert.AreEqual(0, solutionList.Count);
            }
        }
예제 #12
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        public void TestSolution5ClosedNotFixed()
        {
            // create problem.
            var problem = TSPTWHelper.CreateDirectedTSPTW(0, 0, 5, 10, 1);

            problem.Times.SetWeight(0, 1, 2);
            problem.Times.SetWeight(1, 2, 2);
            problem.Times.SetWeight(2, 3, 2);
            problem.Times.SetWeight(3, 4, 2);
            problem.Times.SetWeight(4, 0, 2);
            problem.Windows[2] = new TimeWindow()
            {
                Min = 3,
                Max = 5
            };
            problem.Windows[4] = new TimeWindow()
            {
                Min = 7,
                Max = 9
            };
            var objective = new TSPTWObjective();

            // create the solver.
            var solver = new VNSSolver();

            for (int i = 0; i < 10; i++)
            {
                // generate solution.
                float fitness;
                var   solution = solver.Solve(problem, objective, out fitness);

                // test contents.
                Assert.AreEqual(10, fitness);
                var solutionList = new List <int>(solution);
                Assert.AreEqual(5, solutionList.Count);
            }
        }