1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 |
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22 | using HeuristicLab.Common;
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23 | using HeuristicLab.Core;
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24 | using HeuristicLab.Data;
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25 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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26 | using System;
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27 | using System.Collections.Generic;
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28 | using System.Globalization;
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29 | using System.Linq;
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30 |
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31 | namespace HeuristicLab.BioBoost.ProblemDescription {
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32 |
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33 | [StorableClass]
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34 | public class NeighborhoodTable : Item, IStringConvertibleMatrix {
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35 |
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36 | public struct Key : IComparable<Key> {
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37 | public Key(int id, int degree) {
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38 | Id = id;
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39 | Degree = degree;
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40 | }
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41 | public int Id;
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42 | public int Degree;
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43 |
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44 | public int CompareTo(Key other) {
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45 | return Id.CompareTo(other.Id) == 0 ? Degree.CompareTo(other.Degree) : Id.CompareTo(other.Id);
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46 | }
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47 |
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48 | public override string ToString() {
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49 | return string.Format("{0}[{1}]", Id, Degree);
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50 | }
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51 | }
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52 |
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53 | [Storable]
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54 | private Dictionary<Key, HashSet<int>> table;
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55 |
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56 | [Storable]
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57 | private Dictionary<int, HashSet<int>> degrees;
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58 |
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59 | [Storable]
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60 | private int maxNNeighborsByDegree;
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61 |
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62 | #region Construction & Cloning
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63 | [StorableConstructor]
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64 | protected NeighborhoodTable(bool isDeserializing) : base(isDeserializing) {}
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65 | protected NeighborhoodTable(NeighborhoodTable orig, Cloner cloner) : base(orig, cloner) {
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66 | table = orig.table.ToDictionary(p => p.Key, p => p.Value);
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67 | degrees = orig.degrees.ToDictionary(p => p.Key, p => p.Value);
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68 | maxNNeighborsByDegree = orig.maxNNeighborsByDegree;
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69 | }
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70 | public NeighborhoodTable() {
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71 | table = new Dictionary<Key, HashSet<int>>();
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72 | degrees = new Dictionary<int, HashSet<int>>();
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73 | maxNNeighborsByDegree = 0;
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74 | }
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75 | public override IDeepCloneable Clone(Cloner cloner) {
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76 | return new NeighborhoodTable(this, cloner);
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77 | }
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78 | #endregion
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79 |
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80 | public void AddEntry(int id1, int id2, int degree) {
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81 | var key = new Key(id1, degree);
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82 | HashSet<int> forwardSet;
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83 | if (table.TryGetValue(key, out forwardSet)) {
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84 | forwardSet.Add(id2);
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85 | maxNNeighborsByDegree = Math.Max(maxNNeighborsByDegree, forwardSet.Count);
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86 | } else {
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87 | table[key] = new HashSet<int> {id2};
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88 | maxNNeighborsByDegree = Math.Max(maxNNeighborsByDegree, 1);
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89 | }
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90 | HashSet<int> deg;
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91 | if (degrees.TryGetValue(id1, out deg)) {
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92 | deg.Add(degree);
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93 | } else {
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94 | degrees[id1] = new HashSet<int> {degree};
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95 | }
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96 | }
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97 |
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98 | public HashSet<int> GetNeighbors(int id, int degree) {
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99 | return table[new Key(id, degree)];
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100 | }
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101 |
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102 | public Dictionary<int, HashSet<int>> GetNeighbors(int id) {
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103 | return degrees[id].ToDictionary(deg => deg, deg => table[new Key(id, deg)]);
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104 | }
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105 |
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106 | public HashSet<int>[] GetNeighborsFlat(int id) {
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107 | HashSet<int> neighborDegrees;
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108 | if (degrees.TryGetValue(id, out neighborDegrees))
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109 | return neighborDegrees.OrderBy(d => d).Select(d => table[new Key(id, d)]).ToArray();
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110 | return new HashSet<int>[0];
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111 | }
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112 |
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113 | private double Sqr(double x) { return x*x; }
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114 |
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115 | public int GetRandomNeighbor(int id, IRandom random, int maxId) {
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116 | var neighbors = GetNeighborsFlat(id);
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117 | if (neighbors.Length == 0) return id;
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118 | var classIndex = (int) Math.Round(Sqr(random.NextDouble())*(neighbors.Length));
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119 | if (classIndex >= neighbors.Length)
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120 | return random.Next(maxId);
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121 | var clazz = neighbors[classIndex];
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122 | return clazz.ElementAt(random.Next(clazz.Count));
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123 | }
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124 |
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125 | public void Check() {
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126 | var errors = new List<string>();
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127 | foreach (var key in table.Keys) {
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128 | foreach (var neighbor in table[key]) {
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129 | HashSet<int> reverseNeighbors;
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130 | if (table.TryGetValue(new Key(neighbor, key.Degree), out reverseNeighbors))
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131 | if (reverseNeighbors.Contains(key.Id))
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132 | continue;
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133 | errors.Add(string.Format("Reverse relationship of {0}->{1} at degree {2} not found",
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134 | key.Id, neighbor, key.Degree));
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135 | }
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136 | }
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137 | var uniqueNeighbors = new Dictionary<int, HashSet<int>>();
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138 | foreach (var key in table.Keys) {
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139 | HashSet<int> neighbors;
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140 | if (!uniqueNeighbors.TryGetValue(key.Id, out neighbors)) {
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141 | neighbors = new HashSet<int>();
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142 | }
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143 | foreach (var neighbor in table[key]) {
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144 | if (neighbors.Contains(neighbor))
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145 | errors.Add(string.Format("Duplicate neighbor {0} of {1} with multiple degrees", neighbor, key.Id));
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146 | }
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147 | }
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148 | if (errors.Count > 0)
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149 | throw new Exception(string.Format("NeighborhoodTable Check Failed:\n{0}", string.Join("\n", errors)));
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150 | }
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151 |
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152 | #region Implementation of IStringConvertibleMatrix
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153 |
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154 | public bool Validate(string value, out string errorMessage) {
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155 | throw new NotImplementedException();
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156 | }
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157 |
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158 | public string GetValue(int rowIndex, int columnIndex) {
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159 | return table.OrderBy(p => p.Key).ElementAt(rowIndex).Value.ElementAt(columnIndex).ToString(CultureInfo.InvariantCulture);
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160 | }
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161 |
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162 | public bool SetValue(string value, int rowIndex, int columnIndex) {
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163 | throw new NotImplementedException();
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164 | }
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165 |
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166 | public int Rows { get { return table.Count; } set { throw new NotImplementedException(); } }
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167 | public int Columns { get { return 2+maxNNeighborsByDegree; } set { throw new NotImplementedException(); } }
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168 |
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169 | public IEnumerable<string> ColumnNames {
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170 | get {
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171 | return new[] {"ID", "Degree"}.Concat(
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172 | Enumerable.Range(0, maxNNeighborsByDegree).Select(n => string.Format("Neighbor {0}", n)));
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173 | }
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174 | set { throw new NotImplementedException(); }
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175 | }
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176 | public IEnumerable<string> RowNames {
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177 | get { return Enumerable.Range(0, Rows).Select(i => i.ToString(CultureInfo.InvariantCulture)); }
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178 | set { throw new NotImplementedException(); }
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179 | }
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180 |
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181 | public bool SortableView { get { return false; } set { throw new NotImplementedException(); } }
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182 | public bool ReadOnly { get { return true; } }
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183 |
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184 | public event EventHandler ColumnsChanged;
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185 | public event EventHandler RowsChanged;
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186 | public event EventHandler ColumnNamesChanged;
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187 | public event EventHandler RowNamesChanged;
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188 | public event EventHandler SortableViewChanged;
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189 | public event EventHandler<EventArgs<int, int>> ItemChanged;
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190 | public event EventHandler Reset;
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191 |
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192 | #endregion
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193 |
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194 | public NeighborhoodTable CopyAndRemoveIndices(IEnumerable<int> removedIndices) {
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195 | if (table.Count == 0)
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196 | return new NeighborhoodTable();
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197 | var removedIndexSet = new HashSet<int>(removedIndices);
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198 | int i = 0;
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199 | var mapping = Enumerable
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200 | .Range(0, table.Keys.Select(k => k.Id).Max() + 1)
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201 | .ToDictionary(
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202 | oldIdx => oldIdx,
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203 | oldIdx => {
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204 | if (removedIndexSet.Contains(oldIdx)) return -1;
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205 | return i++;
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206 | });
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207 | var newTable = new NeighborhoodTable();
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208 | foreach (var entry in table.Keys) {
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209 | foreach (var neighbor in table[entry]) {
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210 | var newSource = mapping[entry.Id];
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211 | var newTarget = mapping[neighbor];
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212 | if (newSource != -1 && newTarget != -1) {
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213 | newTable.AddEntry(newSource, newTarget, entry.Degree);
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214 | }
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215 | }
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216 | }
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217 | newTable.Check();
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218 | return newTable;
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219 | }
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220 | }
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221 | }
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