1 | // This file is a part of Framsticks SDK. http://www.framsticks.com/ |
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2 | // Copyright (C) 2019-2021 Maciej Komosinski and Szymon Ulatowski. |
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3 | // See LICENSE.txt for details. |
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4 | |
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5 | |
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6 | #include <vector> |
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7 | #include <numeric> //std::accumulate() |
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8 | #include "common/loggers/loggertostdout.h" |
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9 | #include "frams/genetics/preconfigured.h" |
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10 | #include "frams/genetics/genman.h" |
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11 | #include "frams/model/model.h" |
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12 | #include "frams/model/geometry/modelgeometryinfo.h" |
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13 | |
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14 | |
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15 | struct Individual |
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16 | { |
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17 | Geno geno; |
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18 | double fitness; |
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19 | }; |
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20 | |
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21 | double criterion(char symbol, double value) |
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22 | { |
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23 | return isupper(symbol) ? value : -value; |
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24 | } |
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25 | |
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26 | double get_fitness(const Individual &ind, const char *fitness_def) |
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27 | { |
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28 | const double GEOM_DENSITY = 5.0; //needs testing and adjusting as needed - tradeoff between precision and speed |
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29 | |
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30 | SString genotype = ind.geno.getGenes(); |
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31 | Model model = Model(ind.geno, Model::SHAPETYPE_UNKNOWN); |
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32 | double fitness = 0; |
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33 | const char *p = fitness_def; |
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34 | |
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35 | Orient axes; |
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36 | Pt3D sizes; |
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37 | while (*p) |
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38 | { |
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39 | switch (*p) |
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40 | { |
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41 | case '0': |
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42 | break; |
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43 | case '!': //special symbol for current fitness (used only in printing population stats) |
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44 | fitness += ind.fitness; |
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45 | break; |
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46 | case 'g': |
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47 | case 'G': |
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48 | fitness += criterion(*p, genotype.length()); |
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49 | break; |
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50 | case 'p': |
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51 | case 'P': |
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52 | fitness += criterion(*p, model.getPartCount()); |
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53 | break; |
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54 | case 'j': |
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55 | case 'J': |
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56 | fitness += criterion(*p, model.getJointCount()); |
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57 | break; |
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58 | case 'n': |
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59 | case 'N': |
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60 | fitness += criterion(*p, model.getNeuroCount()); |
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61 | break; |
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62 | case 'c': |
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63 | case 'C': |
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64 | fitness += criterion(*p, model.getConnectionCount()); |
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65 | break; |
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66 | case 'b': |
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67 | case 'B': |
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68 | fitness += criterion(*p, model.size.x * model.size.y * model.size.z); |
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69 | break; |
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70 | case 's': |
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71 | case 'S': |
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72 | fitness += criterion(*p, ModelGeometryInfo::area(model, GEOM_DENSITY)); |
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73 | break; |
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74 | case 'v': |
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75 | case 'V': |
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76 | fitness += criterion(*p, ModelGeometryInfo::volume(model, GEOM_DENSITY)); |
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77 | break; |
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78 | case 'l': |
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79 | case 'L': |
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80 | ModelGeometryInfo::findSizesAndAxes(model, GEOM_DENSITY, sizes, axes); |
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81 | fitness += criterion(*p, sizes.x); |
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82 | break; |
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83 | case 'w': |
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84 | case 'W': |
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85 | ModelGeometryInfo::findSizesAndAxes(model, GEOM_DENSITY, sizes, axes); |
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86 | fitness += criterion(*p, sizes.y); |
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87 | break; |
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88 | case 'h': |
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89 | case 'H': |
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90 | ModelGeometryInfo::findSizesAndAxes(model, GEOM_DENSITY, sizes, axes); |
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91 | fitness += criterion(*p, sizes.z); |
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92 | break; |
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93 | default: |
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94 | printf("Unknown fitness criterion symbol: '%c'\n", *p); |
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95 | exit(3); |
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96 | } |
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97 | p++; |
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98 | } |
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99 | return fitness; |
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100 | } |
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101 | |
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102 | void update_fitness(Individual &ind, const char *fitness_def) |
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103 | { |
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104 | ind.fitness = get_fitness(ind, fitness_def); |
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105 | } |
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106 | |
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107 | void print_stats(const vector<Individual> &population, char criterion) |
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108 | { |
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109 | vector<double> criterion_values; |
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110 | char crit[2] = { 0 }; |
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111 | crit[0] = criterion; |
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112 | for (const Individual& ind : population) |
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113 | criterion_values.push_back(get_fitness(ind, crit)); |
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114 | printf("%g,%g,%g", *std::min_element(criterion_values.begin(), criterion_values.end()), |
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115 | std::accumulate(criterion_values.begin(), criterion_values.end(), 0.0) / criterion_values.size(), |
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116 | *std::max_element(criterion_values.begin(), criterion_values.end())); |
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117 | } |
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118 | |
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119 | int tournament(const vector<Individual> &population, int tournament_size) |
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120 | { |
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121 | int best = -1; |
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122 | for (int i = 0; i < tournament_size; i++) |
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123 | { |
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124 | int rnd = rndUint(population.size()); |
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125 | if (best == -1) best = rnd; |
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126 | else if (population[rnd].fitness > population[best].fitness) //assume maximization |
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127 | best = rnd; |
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128 | } |
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129 | return best; |
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130 | } |
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131 | |
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132 | |
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133 | // A minimalistic steady-state evolutionary algorithm. |
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134 | int main(int argc, char *argv[]) |
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135 | { |
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136 | PreconfiguredGenetics genetics; |
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137 | LoggerToStdout messages_to_stdout(LoggerBase::Enable); |
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138 | GenMan genman; |
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139 | |
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140 | bool deterministic; |
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141 | int pop_size, nr_evals; |
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142 | double prob_mut, prob_xover; |
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143 | const char* format; |
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144 | const char* fitness_def; |
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145 | |
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146 | if (argc < 8) |
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147 | { |
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148 | printf("Too few parameters!\n"); |
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149 | printf("Command line: <deterministic?_0_or_1> <population_size> <nr_evaluations> <prob_mut> <prob_xover> <genetic_format> <fitness_definition>\n"); |
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150 | printf("Example: 1 10 50 0.6 0.4 4 NC\n\n"); |
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151 | printf("Fitness definition is a sequence of capital (+1 weight) and small (-1 weight) letters.\n"); |
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152 | printf("Each letter corresponds to one fitness criterion, and they are all weighted and added together.\n"); |
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153 | printf(" 0 - a constant value of 0 that provides a flat fitness landscape (e.g. for testing biases of genetic operators).\n"); |
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154 | printf(" g or G - genotype length in characters.\n"); |
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155 | printf(" p or P - number of Parts.\n"); |
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156 | printf(" j or J - number of Joints.\n"); |
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157 | printf(" n or N - number of Neurons.\n"); |
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158 | printf(" c or C - number of neural Connections.\n"); |
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159 | printf(" b or B - volume of the bounding box (absolute coordinates).\n"); |
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160 | printf(" s or S - surface area of the Model.\n"); |
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161 | printf(" v or V - volume of the Model.\n"); |
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162 | printf(" l or L - length of the Model (largest dimension).\n"); |
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163 | printf(" w or W - width of the Model (2nd largest dimension).\n"); |
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164 | printf(" h or H - height of the Model (smallest dimension).\n"); |
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165 | |
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166 | printf("\nThe output consists of 7 columns separated by the TAB character.\n"); |
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167 | printf("The first column is the number of mutated or crossed over and evaluated genotypes.\n"); |
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168 | printf("The remaining columns are triplets of min,avg,max (in the population) of fitness, Parts, Joints, Neurons, Connections, genotype characters.\n"); |
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169 | printf("Finally, the genotypes in the last population are printed with their fitness values.\n"); |
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170 | return 1; |
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171 | } |
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172 | |
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173 | deterministic = atoi(argv[1]) == 1; |
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174 | pop_size = atoi(argv[2]); |
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175 | nr_evals = atoi(argv[3]); |
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176 | prob_mut = atof(argv[4]); |
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177 | prob_xover = atof(argv[5]); |
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178 | format = argv[6]; |
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179 | fitness_def = argv[7]; |
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180 | |
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181 | if (!deterministic) |
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182 | rndGetInstance().randomize(); |
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183 | |
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184 | vector<Individual> population(pop_size); |
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185 | for (Individual& ind : population) |
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186 | { |
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187 | ind.geno = genman.getSimplest(format); |
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188 | if (ind.geno.getGenes() == "") |
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189 | { |
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190 | printf("Could not get the simplest genotype for format '%s'\n", format); |
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191 | return 2; |
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192 | } |
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193 | update_fitness(ind, fitness_def); |
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194 | } |
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195 | for (int i = 0; i < nr_evals; i++) |
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196 | { |
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197 | int selected_positive = tournament(population, std::max(2, int(sqrt(population.size()) / 2))); //moderate positive selection pressure |
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198 | int selected_negative = rndUint(population.size()); //random negative selection |
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199 | |
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200 | double rnd = rndDouble(prob_mut + prob_xover); |
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201 | if (rnd < prob_mut) |
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202 | { |
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203 | Geno mutant = genman.mutate(population[selected_positive].geno); |
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204 | if (mutant.getGenes() == "") |
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205 | { |
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206 | printf("Failed mutation (%s) of '%s'\n", mutant.getComment().c_str(), population[selected_positive].geno.getGenes().c_str()); |
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207 | } |
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208 | else |
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209 | { |
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210 | population[selected_negative].geno = mutant; |
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211 | update_fitness(population[selected_negative], fitness_def); |
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212 | } |
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213 | } |
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214 | else |
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215 | { |
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216 | int selected_positive2 = tournament(population, std::max(2, int(sqrt(population.size()) / 2))); |
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217 | Geno xover = genman.crossOver(population[selected_positive].geno, population[selected_positive2].geno); |
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218 | if (xover.getGenes() == "") |
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219 | { |
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220 | printf("Failed crossover (%s) of '%s' and '%s'\n", xover.getComment().c_str(), population[selected_positive].geno.getGenes().c_str(), population[selected_positive2].geno.getGenes().c_str()); |
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221 | } |
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222 | else |
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223 | { |
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224 | population[selected_negative].geno = xover; |
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225 | update_fitness(population[selected_negative], fitness_def); |
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226 | } |
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227 | } |
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228 | |
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229 | if (i % population.size() == 0 || i == nr_evals - 1) |
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230 | { |
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231 | printf("Evaluation %d", i); |
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232 | for (char c : string("!PJNCG")) |
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233 | { |
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234 | printf("\t"); |
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235 | print_stats(population, c); |
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236 | } |
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237 | printf("\n"); |
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238 | } |
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239 | } |
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240 | for (const Individual& ind : population) |
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241 | { |
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242 | printf("%.1f\t", ind.fitness); |
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243 | printf("%s\n", ind.geno.getGenesAndFormat().c_str()); |
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244 | } |
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245 | |
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246 | return 0; |
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247 | } |
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