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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.Text; |
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5 | |
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6 | namespace BCMToolbox |
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7 | { |
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8 | public static class MathToolbox |
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9 | { |
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10 | static Random r = new Random(); |
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11 | // returns a random gaussian with mean 0 and sigma 1 |
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12 | public static double GetRandomGaussian() |
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13 | { |
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14 | double x1, x2, w, y1, y2; |
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15 | |
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16 | do |
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17 | { |
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18 | x1 = 2.0 * r.NextDouble() - 1.0; |
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19 | x2 = 2.0 * r.NextDouble() - 1.0; |
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20 | w = x1 * x1 + x2 * x2; |
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21 | } while (w >= 1.0); |
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22 | |
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23 | w = Math.Sqrt((-2.0 * Math.Log(w, Math.E)) / w); |
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24 | y1 = x1 * w; |
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25 | y2 = x2 * w; |
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26 | return y1; |
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27 | } |
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28 | |
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29 | public static Func<double, double> Sigmoid |
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30 | { |
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31 | get |
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32 | { |
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33 | return x => 1 / (1 + Math.Exp(-x)); |
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34 | } |
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35 | } |
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36 | |
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37 | public static Func<double, double> InverseSigmoid |
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38 | { |
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39 | get |
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40 | { |
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41 | return (y => -Math.Log((1 - y) / y, Math.E)); |
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42 | } |
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43 | } |
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44 | } |
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45 | } |
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