1 | using System;
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2 | using System.Collections.Generic;
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3 | using System.Linq;
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4 | using System.Management.Instrumentation;
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5 | using System.Text;
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6 | using System.Threading.Tasks;
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7 | using HeuristicLab.BioBoost.ProblemDescription;
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8 | using HeuristicLab.BioBoost.Representation;
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9 | using HeuristicLab.Common;
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10 | using HeuristicLab.Core;
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11 | using HeuristicLab.Data;
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12 | using HeuristicLab.Encodings.IntegerVectorEncoding;
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13 | using HeuristicLab.Operators;
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14 | using HeuristicLab.Optimization;
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15 | using HeuristicLab.Parameters;
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16 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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17 |
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18 | namespace HeuristicLab.BioBoost.Operators.Mutation {
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19 |
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20 | public class PlantMover : SingleSuccessorOperator, IManipulator, IStochasticOperator {
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21 |
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22 | #region Parameters
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23 | public LookupParameter<BioBoostProblemData> ProblemDataParameter { get { return (LookupParameter<BioBoostProblemData>) Parameters["ProblemData"]; } }
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24 | public LookupParameter<DistanceMatrix> DistanceMatrixParameter { get { return (LookupParameter<DistanceMatrix>) Parameters["DistanceMatrix"]; } }
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25 | public ValueParameter<BoolValue> DistanceMatrixInProblemDataParameter { get { return (ValueParameter<BoolValue>) Parameters["DistanceMatrixInProblemData"]; } }
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26 | public ValueLookupParameter<IntMatrix> RegionBoundsParameter { get { return (ValueLookupParameter<IntMatrix>) Parameters["RegionBounds"]; } }
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27 | public ILookupParameter<IRandom> RandomParameter { get { return (ILookupParameter<IRandom>) Parameters["Random"]; } }
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28 | public IValueLookupParameter<PercentValue> MergeAvoidanceProbabilityParameter { get { return (IValueLookupParameter<PercentValue>) Parameters["MergeAvoidanceProbability"]; } }
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29 | public IValueLookupParameter<PercentValue> SplitProbabilityParameter { get { return (IValueLookupParameter<PercentValue>) Parameters["SplitProbability"]; } }
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30 | public IValueLookupParameter<PercentValue> MovePercentageParameter { get { return (IValueLookupParameter<PercentValue>) Parameters["MovePercentage"]; } }
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31 | #endregion
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32 |
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33 |
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34 |
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35 | #region Parameter Values
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36 | public BioBoostProblemData ProblemData { get { return ProblemDataParameter.ActualValue; } }
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37 | public IntMatrix RegionBounds { get { return RegionBoundsParameter.ActualValue; } }
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38 | public IRandom Random { get { return RandomParameter.ActualValue; } }
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39 | public bool DistanceMatrixInProblemData { get { return DistanceMatrixInProblemDataParameter.Value.Value; } }
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40 | public DistanceMatrix DistanceMatrix {
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41 | get {
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42 | if (DistanceMatrixInProblemData) {
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43 | return ((IValueParameter<DistanceMatrix>) ProblemData.Parameters[DistanceMatrixParameter.ActualName]).Value;
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44 | } else {
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45 | return DistanceMatrixParameter.ActualValue;
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46 | }
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47 | }
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48 | }
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49 | public double MergeAvoidanceProbability { get { return MergeAvoidanceProbabilityParameter.Value.Value; } }
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50 | public double SplitProbability { get { return SplitProbabilityParameter.Value.Value; } }
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51 | public double MovePercentage { get { return MovePercentageParameter.Value.Value; } }
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52 | #endregion
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53 |
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54 | #region Construction & Cloning
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55 | [StorableConstructor]
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56 | public PlantMover(bool isDeserializing) {}
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57 | public PlantMover(PlantMover orig, Cloner cloner) : base(orig, cloner) {}
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58 |
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59 | public PlantMover() {
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60 | Parameters.Add(new LookupParameter<BioBoostProblemData>("ProblemData", "The data store of the detailed problem description."));
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61 | Parameters.Add(new LookupParameter<DistanceMatrix>("DistanceMatrix", "The distance matrix to use", "StreetDistanceMatrix")); // TODO: check this
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62 | Parameters.Add(new ValueParameter<BoolValue>("DistanceMatrixInProblemData", "Whether to look for the distance matrix in problem data or in scope.", new BoolValue(true)));
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63 | Parameters.Add(new ValueLookupParameter<IntMatrix>("RegionBounds", "The limits of valid region ids."));
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64 | Parameters.Add(new LookupParameter<IRandom>("Random", "The random number generator."));
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65 | Parameters.Add(new ValueLookupParameter<PercentValue>("MergeAvoidanceProbability", "Probability that a moved plant will avoid existing plant locations.", new PercentValue(1)));
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66 | Parameters.Add(new ValueLookupParameter<PercentValue>("SplitProbability", "Probability that only part of the suppliers will follow to the new location.", new PercentValue(0)));
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67 | Parameters.Add(new ValueLookupParameter<PercentValue>("MovePercentage", "In case a plant is split, the percentage of suppliers that will move.", new PercentValue(0.5)));
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68 | }
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69 |
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70 | public override IDeepCloneable Clone(Cloner cloner) {
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71 | return new PlantMover(this, cloner);
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72 | }
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73 | #endregion
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74 |
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75 | public override IOperation Apply() {
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76 | var scope = ExecutionContext.Scope;
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77 | var dm = DistanceMatrix;
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78 | var feedstock =
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79 | ProblemData.TransportTargets.CheckedItems.ElementAt(
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80 | Random.Next(ProblemData.TransportTargets.CheckedItems.Count())).Value.Value;
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81 | string product = null;
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82 | var productLinks = ProblemData.ProductLinks;
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83 | for (int i = 0; i < productLinks.Rows; i++) {
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84 | if (productLinks[i, 0] == feedstock)
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85 | product = productLinks[i, 1];
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86 | }
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87 | var supplyTransports = scope.Variables[LayerDescriptor.TransportTargets.NameWithPrefix(feedstock)].Value as IntegerVector;
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88 | var productTransportName = LayerDescriptor.TransportTargets.NameWithPrefix(product);
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89 | var productTransports = product == null || !scope.Variables.ContainsKey(productTransportName) ? null
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90 | : scope.Variables[productTransportName].Value as IntegerVector;
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91 | if (supplyTransports != null) {
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92 | var plants = supplyTransports.Select((target, source) => new {target, source}).GroupBy(p => p.target).ToList();
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93 | var plant = plants.ElementAt(Random.Next(plants.Count));
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94 | var forbiddenRegions = new HashSet<int>();
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95 | if (Random.NextDouble() > MergeAvoidanceProbability) {
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96 | forbiddenRegions = new HashSet<int>(plants.Select(p => p.Key));
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97 | }
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98 | var newTarget = FindNewTarget(plant.Key, Random, dm, forbiddenRegions);
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99 | bool split = Random.NextDouble() < SplitProbability;
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100 | foreach (var supplier in plant) {
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101 | if (!split || Random.NextDouble() <= MovePercentage) {
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102 | supplyTransports[supplier.source] = newTarget;
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103 | }
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104 | }
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105 | if (productTransports != null) {
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106 | var temp = productTransports[newTarget];
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107 | productTransports[newTarget] = productTransports[plant.Key];
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108 | productTransports[plant.Key] = temp;
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109 | }
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110 | }
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111 | return base.Apply();
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112 | }
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113 |
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114 | private int FindNewTarget(int oldTarget, IRandom random, DistanceMatrix distances, HashSet<int> forbiddenRegions) {
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115 | var neighborDistances = new double[0].Select((d, idx) => new {index = idx, distance = d}).ToList();
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116 | var maxDistance = 0d;
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117 | for (int j = 0; j < distances.Columns; j++) {
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118 | if (forbiddenRegions.Contains(j)) continue;
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119 | var dist = distances[oldTarget, j];
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120 | neighborDistances.Add(new {index = j, distance = dist});
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121 | maxDistance = Math.Max(dist, maxDistance);
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122 | }
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123 | neighborDistances = neighborDistances.Select(p => new {p.index, distance = maxDistance - p.distance}).ToList();
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124 | neighborDistances.Sort((a, b) => b.distance.CompareTo(a.distance));
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125 | var totalDistance = neighborDistances.Sum(p => p.distance);
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126 | var threshold = random.NextDouble()*totalDistance;
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127 | var sum = 0d;
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128 | var index = 0;
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129 | while (index < neighborDistances.Count && sum < threshold) {
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130 | sum += neighborDistances[index].distance;
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131 | index++;
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132 | }
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133 | index = Math.Min(index, neighborDistances.Count - 1);
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134 | return neighborDistances[index].index;
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135 | }
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136 |
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137 | }
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138 | }
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