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comparison trunk/aid/nn/perceptron.d @ 3:314d68bafeff

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Backprop and backprop_test added (no testing).
author revcompgeek
date Fri, 11 Apr 2008 18:12:55 -0600
parents 9655c8362b25
children ff92c77006c7
comparison
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2:9655c8362b25 3:314d68bafeff
1 module aid.nn.perceptron; 1 module aid.nn.perceptron;
2 2
3 import std.random; 3 import aid.nn.outputFunctions;
4 import aid.misc;
4 import std.math; 5 import std.math;
5 import std.string; 6 import std.string;
6
7 double rnd(){ // The function that should be included in every math library!
8 return (cast(double)rand())/uint.max;
9 }
10
11 class InputException : Exception {
12 this(char[] message){
13 super(message);
14 }
15 }
16
17 // The output functions
18
19 alias double function(double) OutputFunction;
20
21 double sign(double y){
22 if(y>0) return 1;
23 return -1;
24 }
25
26 double sigmoid(double x){
27 return 1/(1+exp(-x));
28 }
29
30 double tanh(double x){
31 return cast(double)tanh(cast(real)x);
32 }
33
34 // End output functions
35 7
36 8
37 class perceptron { 9 class perceptron {
38 private int numInputs; 10 private int numInputs;
39 private double[] weights; 11 private double[] weights;
40 private OutputFunction func; 12 private OutputFunction func;
41 public double learningRate; 13 public double learningRate;
42 14
43 /** 15 /**
44 * This is the constructor for loading the neural network from a string. 16 * This is the constructor for loading the neural network from a string.
45 * 17 *
46 * Params: 18 * Params:
47 * savedString = The string that was output from the save function. 19 * savedString = The string that was output from the save function.
48 * 20 *
49 * Throws: 21 * Throws:
50 * Throws an InputException when the string is in the wrong format. 22 * Throws an InputException when the string is in the wrong format.
72 } 44 }
73 } 45 }
74 46
75 /** 47 /**
76 * Evaluates the neural network. 48 * Evaluates the neural network.
77 * 49 *
78 * Params: 50 * Params:
79 * inputs = The set of inputs to evaluate. 51 * inputs = The set of inputs to evaluate.
80 * 52 *
81 * Returns: 1 to indicate true, -1 for false 53 * Returns: 1 to indicate true, -1 for false
82 */ 54 */
83 55
84 double evaluate(double[] inputs){ 56 double evaluate(double[] inputs){
85 if(inputs.length != numInputs-1) throw new InputException("Wrong input length. %d %d"); 57 if(inputs.length != numInputs-1) throw new InputException("Wrong input length. %d %d");
115 } 87 }
116 } 88 }
117 89
118 /** 90 /**
119 * Calculates the error based on the sum squared error function. 91 * Calculates the error based on the sum squared error function.
120 * 92 *
121 * Params: 93 * Params:
122 * inputs = An array of arrays of all testing inputs. 94 * inputs = An array of arrays of all testing inputs.
123 * outputs = An array of all the outputs that the cooresponding inputs should have. 95 * outputs = An array of all the outputs that the cooresponding inputs should have.
124 * 96 *
125 * Returns: 97 * Returns:
138 } 110 }
139 return total*0.5; 111 return total*0.5;
140 } 112 }
141 } 113 }
142 114
115 // TODO: Impliment loading and saving of files