|
13
|
1 <HTML>
|
|
|
2 <BODY BGCOLOR="white">
|
|
|
3 <PRE>
|
|
|
4 <FONT color="green">001</FONT> /*<a name="line.1"></a>
|
|
|
5 <FONT color="green">002</FONT> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
|
|
|
6 <FONT color="green">003</FONT> * contributor license agreements. See the NOTICE file distributed with<a name="line.3"></a>
|
|
|
7 <FONT color="green">004</FONT> * this work for additional information regarding copyright ownership.<a name="line.4"></a>
|
|
|
8 <FONT color="green">005</FONT> * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
|
|
|
9 <FONT color="green">006</FONT> * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
|
|
|
10 <FONT color="green">007</FONT> * the License. You may obtain a copy of the License at<a name="line.7"></a>
|
|
|
11 <FONT color="green">008</FONT> *<a name="line.8"></a>
|
|
|
12 <FONT color="green">009</FONT> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
|
|
|
13 <FONT color="green">010</FONT> *<a name="line.10"></a>
|
|
|
14 <FONT color="green">011</FONT> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
|
|
|
15 <FONT color="green">012</FONT> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
|
|
|
16 <FONT color="green">013</FONT> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
|
|
|
17 <FONT color="green">014</FONT> * See the License for the specific language governing permissions and<a name="line.14"></a>
|
|
|
18 <FONT color="green">015</FONT> * limitations under the License.<a name="line.15"></a>
|
|
|
19 <FONT color="green">016</FONT> */<a name="line.16"></a>
|
|
|
20 <FONT color="green">017</FONT> package org.apache.commons.math.genetics;<a name="line.17"></a>
|
|
|
21 <FONT color="green">018</FONT> <a name="line.18"></a>
|
|
|
22 <FONT color="green">019</FONT> import java.util.Collections;<a name="line.19"></a>
|
|
|
23 <FONT color="green">020</FONT> import java.util.List;<a name="line.20"></a>
|
|
|
24 <FONT color="green">021</FONT> <a name="line.21"></a>
|
|
|
25 <FONT color="green">022</FONT> /**<a name="line.22"></a>
|
|
|
26 <FONT color="green">023</FONT> * Population of chromosomes which uses elitism (certain percentace of the best<a name="line.23"></a>
|
|
|
27 <FONT color="green">024</FONT> * chromosomes is directly copied to the next generation).<a name="line.24"></a>
|
|
|
28 <FONT color="green">025</FONT> *<a name="line.25"></a>
|
|
|
29 <FONT color="green">026</FONT> * @version $Revision: 811685 $ $Date: 2009-09-05 13:36:48 -0400 (Sat, 05 Sep 2009) $<a name="line.26"></a>
|
|
|
30 <FONT color="green">027</FONT> * @since 2.0<a name="line.27"></a>
|
|
|
31 <FONT color="green">028</FONT> */<a name="line.28"></a>
|
|
|
32 <FONT color="green">029</FONT> public class ElitisticListPopulation extends ListPopulation {<a name="line.29"></a>
|
|
|
33 <FONT color="green">030</FONT> <a name="line.30"></a>
|
|
|
34 <FONT color="green">031</FONT> /** percentage of chromosomes copied to the next generation */<a name="line.31"></a>
|
|
|
35 <FONT color="green">032</FONT> private double elitismRate = 0.9;<a name="line.32"></a>
|
|
|
36 <FONT color="green">033</FONT> <a name="line.33"></a>
|
|
|
37 <FONT color="green">034</FONT> /**<a name="line.34"></a>
|
|
|
38 <FONT color="green">035</FONT> * Creates a new ElitisticListPopulation instance.<a name="line.35"></a>
|
|
|
39 <FONT color="green">036</FONT> *<a name="line.36"></a>
|
|
|
40 <FONT color="green">037</FONT> * @param chromosomes<a name="line.37"></a>
|
|
|
41 <FONT color="green">038</FONT> * list of chromosomes in the population<a name="line.38"></a>
|
|
|
42 <FONT color="green">039</FONT> * @param populationLimit<a name="line.39"></a>
|
|
|
43 <FONT color="green">040</FONT> * maximal size of the population<a name="line.40"></a>
|
|
|
44 <FONT color="green">041</FONT> * @param elitismRate<a name="line.41"></a>
|
|
|
45 <FONT color="green">042</FONT> * how many best chromosomes will be directly transferred to the<a name="line.42"></a>
|
|
|
46 <FONT color="green">043</FONT> * next generation [in %]<a name="line.43"></a>
|
|
|
47 <FONT color="green">044</FONT> */<a name="line.44"></a>
|
|
|
48 <FONT color="green">045</FONT> public ElitisticListPopulation(List<Chromosome> chromosomes, int populationLimit, double elitismRate) {<a name="line.45"></a>
|
|
|
49 <FONT color="green">046</FONT> super(chromosomes, populationLimit);<a name="line.46"></a>
|
|
|
50 <FONT color="green">047</FONT> this.elitismRate = elitismRate;<a name="line.47"></a>
|
|
|
51 <FONT color="green">048</FONT> }<a name="line.48"></a>
|
|
|
52 <FONT color="green">049</FONT> <a name="line.49"></a>
|
|
|
53 <FONT color="green">050</FONT> /**<a name="line.50"></a>
|
|
|
54 <FONT color="green">051</FONT> * Creates a new ListPopulation instance and initializes its inner<a name="line.51"></a>
|
|
|
55 <FONT color="green">052</FONT> * chromosome list.<a name="line.52"></a>
|
|
|
56 <FONT color="green">053</FONT> *<a name="line.53"></a>
|
|
|
57 <FONT color="green">054</FONT> * @param populationLimit maximal size of the population<a name="line.54"></a>
|
|
|
58 <FONT color="green">055</FONT> * @param elitismRate<a name="line.55"></a>
|
|
|
59 <FONT color="green">056</FONT> * how many best chromosomes will be directly transferred to the<a name="line.56"></a>
|
|
|
60 <FONT color="green">057</FONT> * next generation [in %]<a name="line.57"></a>
|
|
|
61 <FONT color="green">058</FONT> */<a name="line.58"></a>
|
|
|
62 <FONT color="green">059</FONT> public ElitisticListPopulation(int populationLimit, double elitismRate) {<a name="line.59"></a>
|
|
|
63 <FONT color="green">060</FONT> super(populationLimit);<a name="line.60"></a>
|
|
|
64 <FONT color="green">061</FONT> this.elitismRate = elitismRate;<a name="line.61"></a>
|
|
|
65 <FONT color="green">062</FONT> }<a name="line.62"></a>
|
|
|
66 <FONT color="green">063</FONT> <a name="line.63"></a>
|
|
|
67 <FONT color="green">064</FONT> /**<a name="line.64"></a>
|
|
|
68 <FONT color="green">065</FONT> * Start the population for the next generation. The<a name="line.65"></a>
|
|
|
69 <FONT color="green">066</FONT> * <code>{@link #elitismRate}<code> percents of the best<a name="line.66"></a>
|
|
|
70 <FONT color="green">067</FONT> * chromosomes are directly copied to the next generation.<a name="line.67"></a>
|
|
|
71 <FONT color="green">068</FONT> *<a name="line.68"></a>
|
|
|
72 <FONT color="green">069</FONT> * @return the beginnings of the next generation.<a name="line.69"></a>
|
|
|
73 <FONT color="green">070</FONT> */<a name="line.70"></a>
|
|
|
74 <FONT color="green">071</FONT> public Population nextGeneration() {<a name="line.71"></a>
|
|
|
75 <FONT color="green">072</FONT> // initialize a new generation with the same parameters<a name="line.72"></a>
|
|
|
76 <FONT color="green">073</FONT> ElitisticListPopulation nextGeneration = new ElitisticListPopulation(this.getPopulationLimit(), this.getElitismRate());<a name="line.73"></a>
|
|
|
77 <FONT color="green">074</FONT> <a name="line.74"></a>
|
|
|
78 <FONT color="green">075</FONT> List<Chromosome> oldChromosomes = this.getChromosomes();<a name="line.75"></a>
|
|
|
79 <FONT color="green">076</FONT> Collections.sort(oldChromosomes);<a name="line.76"></a>
|
|
|
80 <FONT color="green">077</FONT> <a name="line.77"></a>
|
|
|
81 <FONT color="green">078</FONT> // index of the last "not good enough" chromosome<a name="line.78"></a>
|
|
|
82 <FONT color="green">079</FONT> int boundIndex = (int) Math.ceil((1.0 - this.getElitismRate()) * oldChromosomes.size());<a name="line.79"></a>
|
|
|
83 <FONT color="green">080</FONT> for (int i=boundIndex; i<oldChromosomes.size(); i++) {<a name="line.80"></a>
|
|
|
84 <FONT color="green">081</FONT> nextGeneration.addChromosome(oldChromosomes.get(i));<a name="line.81"></a>
|
|
|
85 <FONT color="green">082</FONT> }<a name="line.82"></a>
|
|
|
86 <FONT color="green">083</FONT> return nextGeneration;<a name="line.83"></a>
|
|
|
87 <FONT color="green">084</FONT> }<a name="line.84"></a>
|
|
|
88 <FONT color="green">085</FONT> <a name="line.85"></a>
|
|
|
89 <FONT color="green">086</FONT> /**<a name="line.86"></a>
|
|
|
90 <FONT color="green">087</FONT> * Sets the elitism rate, i.e. how many best chromosomes will be directly<a name="line.87"></a>
|
|
|
91 <FONT color="green">088</FONT> * transferred to the next generation [in %].<a name="line.88"></a>
|
|
|
92 <FONT color="green">089</FONT> *<a name="line.89"></a>
|
|
|
93 <FONT color="green">090</FONT> * @param elitismRate<a name="line.90"></a>
|
|
|
94 <FONT color="green">091</FONT> * how many best chromosomes will be directly transferred to the<a name="line.91"></a>
|
|
|
95 <FONT color="green">092</FONT> * next generation [in %]<a name="line.92"></a>
|
|
|
96 <FONT color="green">093</FONT> */<a name="line.93"></a>
|
|
|
97 <FONT color="green">094</FONT> public void setElitismRate(double elitismRate) {<a name="line.94"></a>
|
|
|
98 <FONT color="green">095</FONT> if (elitismRate < 0 || elitismRate > 1)<a name="line.95"></a>
|
|
|
99 <FONT color="green">096</FONT> throw new IllegalArgumentException("Elitism rate has to be in [0,1]");<a name="line.96"></a>
|
|
|
100 <FONT color="green">097</FONT> this.elitismRate = elitismRate;<a name="line.97"></a>
|
|
|
101 <FONT color="green">098</FONT> }<a name="line.98"></a>
|
|
|
102 <FONT color="green">099</FONT> <a name="line.99"></a>
|
|
|
103 <FONT color="green">100</FONT> /**<a name="line.100"></a>
|
|
|
104 <FONT color="green">101</FONT> * Access the elitism rate.<a name="line.101"></a>
|
|
|
105 <FONT color="green">102</FONT> * @return the elitism rate<a name="line.102"></a>
|
|
|
106 <FONT color="green">103</FONT> */<a name="line.103"></a>
|
|
|
107 <FONT color="green">104</FONT> public double getElitismRate() {<a name="line.104"></a>
|
|
|
108 <FONT color="green">105</FONT> return this.elitismRate;<a name="line.105"></a>
|
|
|
109 <FONT color="green">106</FONT> }<a name="line.106"></a>
|
|
|
110 <FONT color="green">107</FONT> <a name="line.107"></a>
|
|
|
111 <FONT color="green">108</FONT> }<a name="line.108"></a>
|
|
|
112
|
|
|
113
|
|
|
114
|
|
|
115
|
|
|
116
|
|
|
117
|
|
|
118
|
|
|
119
|
|
|
120
|
|
|
121
|
|
|
122
|
|
|
123
|
|
|
124
|
|
|
125
|
|
|
126
|
|
|
127
|
|
|
128
|
|
|
129
|
|
|
130
|
|
|
131
|
|
|
132
|
|
|
133
|
|
|
134
|
|
|
135
|
|
|
136
|
|
|
137
|
|
|
138
|
|
|
139
|
|
|
140
|
|
|
141
|
|
|
142
|
|
|
143
|
|
|
144
|
|
|
145
|
|
|
146
|
|
|
147
|
|
|
148
|
|
|
149
|
|
|
150
|
|
|
151
|
|
|
152
|
|
|
153
|
|
|
154
|
|
|
155
|
|
|
156
|
|
|
157
|
|
|
158
|
|
|
159
|
|
|
160
|
|
|
161
|
|
|
162
|
|
|
163
|
|
|
164
|
|
|
165
|
|
|
166
|
|
|
167
|
|
|
168
|
|
|
169
|
|
|
170
|
|
|
171
|
|
|
172 </PRE>
|
|
|
173 </BODY>
|
|
|
174 </HTML>
|
