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215 lines
17 KiB
Markdown
215 lines
17 KiB
Markdown
This example covers:
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- defining and creating different 'depots', vehicles and their types
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- defining a problem with finite fleet-size
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- reading and creating an algorithm
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- plotting the solution
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It is based on the problem instance P01 defined by
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<em>Cordeau, J.-F., Gendreau, M. and Laporte, G. (1997), A tabu search heuristic for periodic and multi-depot vehicle routing problems. Networks, 30: 105–119.</em>
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Please visit for example <a href="http://neo.lcc.uma.es/vrp/vrp-flavors/multiple-depot-vrp/" target="_blank">this site</a> to get more information on Multiple Depot VRP.
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Before you start, [add the latest release to your pom](https://github.com/jsprit/jsprit/wiki/Add-latest-release-to-your-pom). Additionally, create an output folder in your project directory. Either do it manually or add the following lines to your code (even this obfuscates the code-example a bit):
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<pre><code>File dir = new File("output");
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// if the directory does not exist, create it
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if (!dir.exists()){
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System.out.println("creating directory ./output");
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boolean result = dir.mkdir();
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if(result) System.out.println("./output created");
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}
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</code></pre>
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All services of P01 are stored in an xml-file called vrp_cordeau_01.xml (you can find it [here](https://github.com/jsprit/jsprit/tree/master/jsprit-examples/input)). To read them into your problemBuilder, code the following lines:
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<pre><code>VehicleRoutingProblem.Builder vrpBuilder = VehicleRoutingProblem.Builder.newInstance();
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/*
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* Read cordeau-instance p01, BUT only its services without any vehicles
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*/
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new VrpXMLReader(vrpBuilder).read("input/vrp_cordeau_01.xml");
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</code></pre>
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Define and add depots, vehicles and their types as follows:
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<pre><code>/*
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* add vehicles with its depots
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* 4 depots with the following coordinates:
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* (20,20), (30,40), (50,30), (60,50)
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*
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* each with 4 vehicles each with a capacity of 80
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*/
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int nuOfVehicles = 4;
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int capacity = 80;
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Coordinate firstDepotCoord = Coordinate.newInstance(20, 20);
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Coordinate second = Coordinate.newInstance(30, 40);
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Coordinate third = Coordinate.newInstance(50, 30);
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Coordinate fourth = Coordinate.newInstance(60, 50);
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int depotCounter = 1;
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for(Coordinate depotCoord : Arrays.asList(firstDepotCoord,second,third,fourth)){
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for(int i=0;i<nuOfVehicles;i++){
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String typeId = depotCounter + "_type";
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VehicleType vehicleType = VehicleTypeImpl.Builder.newInstance(typeId).addCapacityDimension(0,capacity).setCostPerDistance(1.0).build();
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String vehicleId = depotCounter + "_" + (i+1) + "_vehicle";
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VehicleImpl.Builder vehicleBuilder = VehicleImpl.Builder.newInstance(vehicleId);
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vehicleBuilder.setStartLocation(Location.newInstance(depotCoord.getX(),depotCoord.getY())); //defines the location of the vehicle and thus the depot
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vehicleBuilder.setType(vehicleType)
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VehicleImpl vehicle = vehicleBuilder.build();
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vrpBuilder.addVehicle(vehicle);
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}
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depotCounter++;
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}
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</code></pre>
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<em>Note that there is no explicit depot definition. Depots are defined by the location of vehicles.</em>
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Set finite fleet-size and build the problem.
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<pre><code>/*
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* define problem with finite fleet
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*/
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vrpBuilder.setFleetSize(FleetSize.FINITE);
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/*
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* build the problem
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*/
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VehicleRoutingProblem vrp = vrpBuilder.build();
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</code></pre>
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Plot it, to see how it looks like.
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<pre><code>Plotter plotter = new Plotter(vrp).plot("output/problem01.png", "p01");
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</code></pre>
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It looks like this:
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Define and run an algorithm to solve the problem.
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<pre><code>/*
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* solve the problem
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*/
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VehicleRoutingAlgorithm vra = Jsprit.createAlgorithm(vrp);
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Collection<VehicleRoutingProblemSolution> solutions = vra.searchSolutions();
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</code></pre>
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You can plot it by:
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<pre><code>Plotter plotter = new Plotter(vrp,Solutions.bestOf(solutions));
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plotter.plot("output/p01_solution.png", "p01");
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</code></pre>
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and print the results to your console by:
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<pre><code>SolutionPrinter.print(vrp,Solutions.bestOf(solutions),Print.VERBOSE);
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</code></pre>
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<pre><samp>+--------------------------+
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| problem |
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+---------------+----------+
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| indicator | value |
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+---------------+----------+
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| nJobs | 50 |
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| nServices | 50 |
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| nShipments | 0 |
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| fleetsize | FINITE |
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+--------------------------+
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+----------------------------------------------------------+
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| solution |
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+---------------+------------------------------------------+
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| indicator | value |
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+---------------+------------------------------------------+
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| costs | 582.9805315622696 |
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| nVehicles | 11 |
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+----------------------------------------------------------+
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+--------------------------------------------------------------------------------------------------------------------------------+
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| detailed solution |
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+---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+
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| route | vehicle | activity | job | arrTime | endTime | costs |
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+---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+
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| 1 | 3_1_vehicle | start | - | undef | 0 | 0 |
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| 1 | 3_1_vehicle | service | 9 | 4 | 4 | 4 |
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| 1 | 3_1_vehicle | service | 34 | 13 | 13 | 13 |
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| 1 | 3_1_vehicle | service | 30 | 19 | 19 | 19 |
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| 1 | 3_1_vehicle | service | 39 | 31 | 31 | 31 |
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| 1 | 3_1_vehicle | service | 10 | 41 | 41 | 41 |
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| 1 | 3_1_vehicle | end | - | 50 | undef | 50 |
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+---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+
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| 2 | 2_2_vehicle | start | - | undef | 0 | 0 |
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| 2 | 2_2_vehicle | service | 11 | 12 | 12 | 12 |
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| 2 | 2_2_vehicle | service | 32 | 18 | 18 | 18 |
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| 2 | 2_2_vehicle | service | 1 | 25 | 25 | 25 |
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| 2 | 2_2_vehicle | service | 22 | 32 | 32 | 32 |
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| 2 | 2_2_vehicle | service | 28 | 42 | 42 | 42 |
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| 2 | 2_2_vehicle | service | 31 | 48 | 48 | 48 |
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| 2 | 2_2_vehicle | service | 26 | 58 | 58 | 58 |
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| 2 | 2_2_vehicle | end | - | 86 | undef | 86 |
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+---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+
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| 3 | 2_4_vehicle | start | - | undef | 0 | 0 |
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| 3 | 2_4_vehicle | service | 46 | 2 | 2 | 2 |
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| 3 | 2_4_vehicle | service | 12 | 9 | 9 | 9 |
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| 3 | 2_4_vehicle | service | 47 | 15 | 15 | 15 |
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| 3 | 2_4_vehicle | end | - | 25 | undef | 25 |
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+---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+
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| 4 | 2_1_vehicle | start | - | undef | 0 | 0 |
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| 4 | 2_1_vehicle | service | 23 | 22 | 22 | 22 |
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| 4 | 2_1_vehicle | service | 7 | 28 | 28 | 28 |
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| 4 | 2_1_vehicle | service | 43 | 40 | 40 | 40 |
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| 4 | 2_1_vehicle | service | 24 | 53 | 53 | 53 |
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| 4 | 2_1_vehicle | service | 14 | 63 | 63 | 63 |
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| 4 | 2_1_vehicle | end | - | 81 | undef | 81 |
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+---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+
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| 5 | 4_2_vehicle | start | - | undef | 0 | 0 |
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| 5 | 4_2_vehicle | service | 20 | 9 | 9 | 9 |
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| 5 | 4_2_vehicle | service | 3 | 16 | 16 | 16 |
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| 5 | 4_2_vehicle | service | 36 | 28 | 28 | 28 |
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| 5 | 4_2_vehicle | service | 35 | 35 | 35 | 35 |
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| 5 | 4_2_vehicle | end | - | 48 | undef | 48 |
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+---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+
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| 6 | 1_2_vehicle | start | - | undef | 0 | 0 |
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| 6 | 1_2_vehicle | service | 44 | 11 | 11 | 11 |
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| 6 | 1_2_vehicle | service | 45 | 21 | 21 | 21 |
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| 6 | 1_2_vehicle | service | 33 | 28 | 28 | 28 |
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| 6 | 1_2_vehicle | service | 15 | 40 | 40 | 40 |
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| 6 | 1_2_vehicle | service | 37 | 47 | 47 | 47 |
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| 6 | 1_2_vehicle | service | 17 | 52 | 52 | 52 |
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| 6 | 1_2_vehicle | end | - | 60 | undef | 60 |
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+---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+
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| 7 | 3_2_vehicle | start | - | undef | 0 | 0 |
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| 7 | 3_2_vehicle | service | 49 | 3 | 3 | 3 |
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| 7 | 3_2_vehicle | service | 5 | 11 | 11 | 11 |
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| 7 | 3_2_vehicle | service | 38 | 18 | 18 | 18 |
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| 7 | 3_2_vehicle | end | - | 25 | undef | 25 |
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+---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+
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| 8 | 1_3_vehicle | start | - | undef | 0 | 0 |
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| 8 | 1_3_vehicle | service | 25 | 22 | 22 | 22 |
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| 8 | 1_3_vehicle | service | 18 | 33 | 33 | 33 |
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| 8 | 1_3_vehicle | service | 4 | 41 | 41 | 41 |
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| 8 | 1_3_vehicle | end | - | 47 | undef | 47 |
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+---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+
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| 9 | 2_3_vehicle | start | - | undef | 0 | 0 |
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| 9 | 2_3_vehicle | service | 6 | 11 | 11 | 11 |
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| 9 | 2_3_vehicle | service | 48 | 20 | 20 | 20 |
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| 9 | 2_3_vehicle | service | 8 | 30 | 30 | 30 |
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| 9 | 2_3_vehicle | service | 27 | 44 | 44 | 44 |
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| 9 | 2_3_vehicle | end | - | 52 | undef | 52 |
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+---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+
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| 10 | 4_3_vehicle | start | - | undef | 0 | 0 |
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| 10 | 4_3_vehicle | service | 29 | 3 | 3 | 3 |
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| 10 | 4_3_vehicle | service | 2 | 12 | 12 | 12 |
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| 10 | 4_3_vehicle | service | 16 | 20 | 20 | 20 |
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| 10 | 4_3_vehicle | service | 50 | 26 | 26 | 26 |
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| 10 | 4_3_vehicle | service | 21 | 34 | 34 | 34 |
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| 10 | 4_3_vehicle | end | - | 42 | undef | 42 |
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+---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+
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| 11 | 1_4_vehicle | start | - | undef | 0 | 0 |
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| 11 | 1_4_vehicle | service | 13 | 16 | 16 | 16 |
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| 11 | 1_4_vehicle | service | 41 | 25 | 25 | 25 |
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| 11 | 1_4_vehicle | service | 40 | 37 | 37 | 37 |
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| 11 | 1_4_vehicle | service | 19 | 48 | 48 | 48 |
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| 11 | 1_4_vehicle | service | 42 | 57 | 57 | 57 |
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| 11 | 1_4_vehicle | end | - | 67 | undef | 67 |
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+--------------------------------------------------------------------------------------------------------------------------------+
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</samp></pre>
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You can find the entire code <a href="https://github.com/jsprit/jsprit/blob/v1.6/jsprit-examples/src/main/java/jsprit/examples/MultipleDepotExample.java" target="_blank">here</a>.
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