Image Component Library (ICL)
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00001 /******************************************************************** 00002 ** Image Component Library (ICL) ** 00003 ** ** 00004 ** Copyright (C) 2006-2013 CITEC, University of Bielefeld ** 00005 ** Neuroinformatics Group ** 00006 ** Website: www.iclcv.org and ** 00007 ** http://opensource.cit-ec.de/projects/icl ** 00008 ** ** 00009 ** File : ICLMath/src/ICLMath/LeastSquareModelFitting.h ** 00010 ** Module : ICLMath ** 00011 ** Authors: Christof Elbrechter ** 00012 ** ** 00013 ** ** 00014 ** GNU LESSER GENERAL PUBLIC LICENSE ** 00015 ** This file may be used under the terms of the GNU Lesser General ** 00016 ** Public License version 3.0 as published by the ** 00017 ** ** 00018 ** Free Software Foundation and appearing in the file LICENSE.LGPL ** 00019 ** included in the packaging of this file. Please review the ** 00020 ** following information to ensure the license requirements will ** 00021 ** be met: http://www.gnu.org/licenses/lgpl-3.0.txt ** 00022 ** ** 00023 ** The development of this software was supported by the ** 00024 ** Excellence Cluster EXC 277 Cognitive Interaction Technology. ** 00025 ** The Excellence Cluster EXC 277 is a grant of the Deutsche ** 00026 ** Forschungsgemeinschaft (DFG) in the context of the German ** 00027 ** Excellence Initiative. ** 00028 ** ** 00029 ********************************************************************/ 00030 00031 #pragma once 00032 00033 #include <ICLUtils/CompatMacros.h> 00034 #include <ICLMath/DynMatrix.h> 00035 00036 namespace icl{ 00037 namespace math{ 00038 00040 00132 template<class T, class DataPoint> 00133 class LeastSquareModelFitting{ 00134 public: 00136 00137 typedef Function<void,const DataPoint&,T*> DesignMatrixGen; 00138 00140 typedef std::vector<T> Model; 00141 00142 private: 00144 int m_modelDim; 00145 00147 DesignMatrixGen m_gen; 00148 00150 DynMatrix<T> m_D, m_S, m_Evecs, m_Evals, m_svdU, m_svdS, m_svdVt; 00151 00153 SmartPtr<DynMatrix<T> >m_C; 00154 00156 Model m_model; 00157 00158 public: 00159 00161 LeastSquareModelFitting(){} 00162 00164 LeastSquareModelFitting(int modelDim, DesignMatrixGen gen, 00165 DynMatrix<T> *constraintMatrix=0): 00166 m_modelDim(modelDim),m_gen(gen),m_S(modelDim,modelDim), 00167 m_C(constraintMatrix),m_model(modelDim){ 00168 00169 } 00170 00172 00173 icl64f getError(const Model &model,const DataPoint &p){ 00174 std::vector<T> d(m_modelDim); 00175 m_gen(p,d.data()); 00176 icl64f e = 0; 00177 for(int i=0;i<m_modelDim;++i) e += d[i] * model[i]; 00178 return fabs(e); 00179 } 00180 00182 00185 Model fit(const std::vector<DataPoint> &points){ 00186 const int M = m_modelDim; 00187 const int N = (int)points.size(); 00188 00189 m_D.setBounds(M,N); 00190 00192 for(int i=0;i<N;i++){ 00193 m_gen(points[i],m_D.row_begin(i)); 00194 } 00195 00197 m_D.transp().mult(m_D,m_S); 00198 00199 00200 00201 DynMatrix<T> Si; 00202 try{ 00203 Si = m_C ? m_S.inv()* (*m_C) : m_S.inv(); 00204 }catch(SingularMatrixException &ex){ 00205 Si = m_C ? m_S.pinv(true)* (*m_C) : m_S.pinv(true); 00206 } 00207 00208 try{ 00209 Si.eigen(m_Evecs, m_Evals); 00211 std::copy(m_Evecs.col_begin(0), m_Evecs.col_end(0), m_model.begin()); 00212 }catch(ICLException &e){ 00213 //Si.svd(m_svdU, m_svdS, m_svdVt); 00214 //SHOW(m_svdS); 00215 // 00216 //std::copy(m_svdU.col_begin(0), m_svdU.col_end(0), m_model.begin()); 00217 // 00218 //for(int i=0;i<N;++i){ 00219 // SHOW(getError(m_model,points[i])); 00220 //} 00221 00222 // this can happen if there is no noise in the input values 00223 // rather than solving Ax = lambda x, we have a 0 eigenvalue lambda 00224 // therefore we have to solve Ax = 0 ?? 00225 DEBUG_LOG("LeastSquareModelFitting:fit: error in eigenvalue decomposition:\n" << e.what()); 00226 std::fill(m_model.begin(),m_model.end(),Range<T>::limits().maxVal); 00227 } 00228 00229 return m_model; 00230 } 00231 }; 00232 } // namespace math 00233 } 00234 00235