source: trunk/yat/classifier/EnsembleBuilder.cc @ 704

Last change on this file since 704 was 704, checked in by Markus Ringnér, 15 years ago

Fixes #104. Also fixed inline bug in Averager.h

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date ID
File size: 3.4 KB
Line 
1// $Id$
2
3/*
4  Copyright (C) The authors contributing to this file.
5
6  This file is part of the yat library, http://lev.thep.lu.se/trac/yat
7
8  The yat library is free software; you can redistribute it and/or
9  modify it under the terms of the GNU General Public License as
10  published by the Free Software Foundation; either version 2 of the
11  License, or (at your option) any later version.
12
13  The yat library is distributed in the hope that it will be useful,
14  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  General Public License for more details.
17
18  You should have received a copy of the GNU General Public License
19  along with this program; if not, write to the Free Software
20  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
21  02111-1307, USA.
22*/
23
24#include "EnsembleBuilder.h"
25#include "DataLookup2D.h"
26#include "KernelLookup.h"
27#include "SubsetGenerator.h"
28#include "SupervisedClassifier.h"
29#include "Target.h"
30#include "yat/utility/matrix.h"
31
32namespace theplu {
33namespace yat {
34namespace classifier {
35
36  EnsembleBuilder::EnsembleBuilder(const SupervisedClassifier& sc, 
37                                   SubsetGenerator& subset) 
38    : mother_(sc), subset_(subset)
39  {
40  }
41
42  EnsembleBuilder::~EnsembleBuilder(void) 
43  {
44    for(size_t i=0; i<classifier_.size(); i++)
45      delete classifier_[i];
46  }
47
48  void EnsembleBuilder::build(void) 
49  {
50    for(u_long i=0; i<subset_.size();++i) {
51      SupervisedClassifier* classifier=
52        mother_.make_classifier(subset_.training_data(i), 
53                                subset_.training_target(i));
54      classifier->train();
55      classifier_.push_back(classifier);
56    }   
57  }
58
59  void  EnsembleBuilder::predict
60  (const DataLookup2D& data, 
61   std::vector<std::vector<statistics::Averager> >& result)
62  {
63    result.clear();
64    result.reserve(subset_.target().nof_classes());   
65    for(size_t i=0; i<subset_.target().nof_classes();i++)
66      result.push_back(std::vector<statistics::Averager>(data.columns()));
67   
68    utility::matrix prediction; 
69    try {
70      const KernelLookup& kernel = dynamic_cast<const KernelLookup&>(data);
71      for(u_long k=0;k<subset_.size();k++) {
72        KernelLookup kernel_peter(kernel,subset_.training_index(k),true);
73        classifier(k).predict(kernel_peter,prediction);
74
75        for(size_t i=0; i<prediction.rows();i++) 
76          for(size_t j=0; j<prediction.columns();j++) 
77            result[i][j].add(prediction(i,j));
78      }
79    }
80    catch (std::bad_cast) {
81      for(u_long k=0;k<subset_.size();k++) {
82        classifier(k).predict(data,prediction);
83        for(size_t i=0; i<prediction.rows();i++) 
84          for(size_t j=0; j<prediction.columns();j++) 
85            result[i][j].add(prediction(i,j));
86       
87      }
88    }
89  }
90
91
92
93  const std::vector<std::vector<statistics::Averager> >& 
94  EnsembleBuilder::validate(void)
95  {
96    validation_result_.clear();
97
98    validation_result_.reserve(subset_.target().nof_classes());   
99    for(size_t i=0; i<subset_.target().nof_classes();i++)
100      validation_result_.push_back(std::vector<statistics::Averager>(subset_.target().size()));
101   
102    utility::matrix prediction; 
103    for(u_long k=0;k<subset_.size();k++) {
104      classifier(k).predict(subset_.validation_data(k),prediction);
105
106      for(size_t i=0; i<prediction.rows();i++) 
107        for(size_t j=0; j<prediction.columns();j++) {
108          validation_result_[i][subset_.validation_index(k)[j]].
109            add(prediction(i,j));
110        }           
111    }
112    return validation_result_;
113  }
114
115}}} // of namespace classifier, yat, and theplu
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