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source: branches/3026_IntegrationIntoSymSpace/HeuristicLab.Problems.Instances.DataAnalysis/3.3/Regression/Feynman/Feynman3.cs @ 18027

Last change on this file since 18027 was 18027, checked in by dpiringe, 3 years ago

#3026

  • merged trunk into branch
File size: 2.9 KB
Line 
1using System;
2using System.Collections.Generic;
3using System.Linq;
4using HeuristicLab.Common;
5using HeuristicLab.Random;
6
7namespace HeuristicLab.Problems.Instances.DataAnalysis {
8  public class Feynman3 : FeynmanDescriptor {
9    private readonly int testSamples;
10    private readonly int trainingSamples;
11
12    public Feynman3() : this((int) DateTime.Now.Ticks, 10000, 10000, null) { }
13
14    public Feynman3(int seed) {
15      Seed            = seed;
16      trainingSamples = 10000;
17      testSamples     = 10000;
18      noiseRatio      = null;
19    }
20
21    public Feynman3(int seed, int trainingSamples, int testSamples, double? noiseRatio) {
22      Seed                 = seed;
23      this.trainingSamples = trainingSamples;
24      this.testSamples     = testSamples;
25      this.noiseRatio      = noiseRatio;
26    }
27
28    public override string Name {
29      get {
30        return string.Format(
31          "I.6.20b exp(-((theta-theta1)/sigma)**2/2)/(sqrt(2*pi)*sigma) | {0}",
32          noiseRatio == null ? "no noise" : string.Format(System.Globalization.CultureInfo.InvariantCulture, "noise={0:g}",noiseRatio));
33      }
34    }
35
36    protected override string TargetVariable { get { return noiseRatio == null ? "f" : "f_noise"; } }
37
38    protected override string[] VariableNames {
39      get { return noiseRatio == null ? new[] { "sigma", "theta", "theta1", "f" } : new[] { "sigma", "theta", "theta1", "f", "f_noise" }; }
40    }
41
42    protected override string[] AllowedInputVariables { get { return new[] {"sigma", "theta", "theta1"}; } }
43
44    public int Seed { get; private set; }
45
46    protected override int TrainingPartitionStart { get { return 0; } }
47    protected override int TrainingPartitionEnd { get { return trainingSamples; } }
48    protected override int TestPartitionStart { get { return trainingSamples; } }
49    protected override int TestPartitionEnd { get { return trainingSamples + testSamples; } }
50
51    protected override List<List<double>> GenerateValues() {
52      var rand = new MersenneTwister((uint) Seed);
53
54      var data   = new List<List<double>>();
55      var sigma  = ValueGenerator.GenerateUniformDistributedValues(rand.Next(), TestPartitionEnd, 1, 3).ToList();
56      var theta  = ValueGenerator.GenerateUniformDistributedValues(rand.Next(), TestPartitionEnd, 1, 3).ToList();
57      var theta1 = ValueGenerator.GenerateUniformDistributedValues(rand.Next(), TestPartitionEnd, 1, 3).ToList();
58
59      var f = new List<double>();
60
61      data.Add(sigma);
62      data.Add(theta);
63      data.Add(theta1);
64      data.Add(f);
65
66      for (var i = 0; i < sigma.Count; i++) {
67        var res = Math.Exp(-Math.Pow((theta[i] - theta1[i]) / sigma[i], 2) / 2) / (Math.Sqrt(2 * Math.PI) * sigma[i]);
68        f.Add(res);
69      }
70
71      var targetNoise = GetNoisyTarget(f, rand);
72      if (targetNoise != null) data.Add(targetNoise);
73
74      return data;
75    }
76  }
77}
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