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 HeuristicLab.Common;
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5 | using HeuristicLab.Random;
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6 |
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7 | namespace HeuristicLab.Problems.Instances.DataAnalysis {
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8 | public class Feynman55 : FeynmanDescriptor {
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9 | private readonly int testSamples;
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10 | private readonly int trainingSamples;
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11 |
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12 | public Feynman55() : this((int) DateTime.Now.Ticks, 10000, 10000, null) { }
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13 |
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14 | public Feynman55(int seed) {
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15 | Seed = seed;
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16 | trainingSamples = 10000;
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17 | testSamples = 10000;
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18 | noiseRatio = null;
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19 | }
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20 |
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21 | public Feynman55(int seed, int trainingSamples, int testSamples, double? noiseRatio) {
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22 | Seed = seed;
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23 | this.trainingSamples = trainingSamples;
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24 | this.testSamples = testSamples;
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25 | this.noiseRatio = noiseRatio;
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26 | }
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27 |
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28 | public override string Name {
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29 | get {
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30 | return string.Format("II.6.11 1/(4*pi*epsilon)*p_d*cos(theta)/r**2 | {0}",
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31 | noiseRatio == null ? "no noise" : string.Format(System.Globalization.CultureInfo.InvariantCulture, "noise={0:g}",noiseRatio));
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32 | }
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33 | }
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34 |
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35 | protected override string TargetVariable { get { return noiseRatio == null ? "Volt" : "Volt_noise"; } }
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36 |
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37 | protected override string[] VariableNames {
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38 | get { return new[] {"epsilon", "p_d", "theta", "r", noiseRatio == null ? "Volt" : "Volt_noise"}; }
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39 | }
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40 |
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41 | protected override string[] AllowedInputVariables { get { return new[] {"epsilon", "p_d", "theta", "r"}; } }
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42 |
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43 | public int Seed { get; private set; }
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44 |
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45 | protected override int TrainingPartitionStart { get { return 0; } }
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46 | protected override int TrainingPartitionEnd { get { return trainingSamples; } }
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47 | protected override int TestPartitionStart { get { return trainingSamples; } }
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48 | protected override int TestPartitionEnd { get { return trainingSamples + testSamples; } }
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49 |
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50 | protected override List<List<double>> GenerateValues() {
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51 | var rand = new MersenneTwister((uint) Seed);
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52 |
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53 | var data = new List<List<double>>();
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54 | var epsilon = ValueGenerator.GenerateUniformDistributedValues(rand.Next(), TestPartitionEnd, 1, 3).ToList();
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55 | var p_d = ValueGenerator.GenerateUniformDistributedValues(rand.Next(), TestPartitionEnd, 1, 3).ToList();
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56 | var theta = ValueGenerator.GenerateUniformDistributedValues(rand.Next(), TestPartitionEnd, 1, 3).ToList();
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57 | var r = ValueGenerator.GenerateUniformDistributedValues(rand.Next(), TestPartitionEnd, 1, 3).ToList();
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58 |
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59 | var Volt = new List<double>();
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60 |
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61 | data.Add(epsilon);
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62 | data.Add(p_d);
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63 | data.Add(theta);
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64 | data.Add(r);
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65 | data.Add(Volt);
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66 |
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67 | for (var i = 0; i < epsilon.Count; i++) {
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68 | var res = 1.0 / (4 * Math.PI * epsilon[i]) * p_d[i] * Math.Cos(theta[i]) / Math.Pow(r[i], 2);
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69 | Volt.Add(res);
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70 | }
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71 |
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72 | if (noiseRatio != null) {
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73 | var Volt_noise = new List<double>();
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74 | var sigma_noise = (double) Math.Sqrt(noiseRatio.Value) * Volt.StandardDeviationPop();
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75 | Volt_noise.AddRange(Volt.Select(md => md + NormalDistributedRandom.NextDouble(rand, 0, sigma_noise)));
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76 | data.Remove(Volt);
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77 | data.Add(Volt_noise);
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78 | }
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79 |
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80 | return data;
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81 | }
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82 | }
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83 | } |
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