1 // This file is part of Eigen, a lightweight C++ template library 2 // for linear algebra. 3 // 4 // Copyright (C) 2008-2009 Gael Guennebaud <gael.guennebaud (at) inria.fr> 5 6 /* NOTE The class IterationController has been adapted from the iteration 7 * class of the GMM++ and ITL libraries. 8 */ 9 10 //======================================================================= 11 // Copyright (C) 1997-2001 12 // Authors: Andrew Lumsdaine <lums (at) osl.iu.edu> 13 // Lie-Quan Lee <llee (at) osl.iu.edu> 14 // 15 // This file is part of the Iterative Template Library 16 // 17 // You should have received a copy of the License Agreement for the 18 // Iterative Template Library along with the software; see the 19 // file LICENSE. 20 // 21 // Permission to modify the code and to distribute modified code is 22 // granted, provided the text of this NOTICE is retained, a notice that 23 // the code was modified is included with the above COPYRIGHT NOTICE and 24 // with the COPYRIGHT NOTICE in the LICENSE file, and that the LICENSE 25 // file is distributed with the modified code. 26 // 27 // LICENSOR MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED. 28 // By way of example, but not limitation, Licensor MAKES NO 29 // REPRESENTATIONS OR WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY 30 // PARTICULAR PURPOSE OR THAT THE USE OF THE LICENSED SOFTWARE COMPONENTS 31 // OR DOCUMENTATION WILL NOT INFRINGE ANY PATENTS, COPYRIGHTS, TRADEMARKS 32 // OR OTHER RIGHTS. 33 //======================================================================= 34 35 //======================================================================== 36 // 37 // Copyright (C) 2002-2007 Yves Renard 38 // 39 // This file is a part of GETFEM++ 40 // 41 // Getfem++ is free software; you can redistribute it and/or modify 42 // it under the terms of the GNU Lesser General Public License as 43 // published by the Free Software Foundation; version 2.1 of the License. 44 // 45 // This program is distributed in the hope that it will be useful, 46 // but WITHOUT ANY WARRANTY; without even the implied warranty of 47 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 48 // GNU Lesser General Public License for more details. 49 // You should have received a copy of the GNU Lesser General Public 50 // License along with this program; if not, write to the Free Software 51 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 52 // USA. 53 // 54 //======================================================================== 55 56 #include "../../../../Eigen/src/Core/util/NonMPL2.h" 57 58 #ifndef EIGEN_ITERATION_CONTROLLER_H 59 #define EIGEN_ITERATION_CONTROLLER_H 60 61 namespace Eigen { 62 63 /** \ingroup IterativeSolvers_Module 64 * \class IterationController 65 * 66 * \brief Controls the iterations of the iterative solvers 67 * 68 * This class has been adapted from the iteration class of GMM++ and ITL libraries. 69 * 70 */ 71 class IterationController 72 { 73 protected : 74 double m_rhsn; ///< Right hand side norm 75 size_t m_maxiter; ///< Max. number of iterations 76 int m_noise; ///< if noise > 0 iterations are printed 77 double m_resmax; ///< maximum residual 78 double m_resminreach, m_resadd; 79 size_t m_nit; ///< iteration number 80 double m_res; ///< last computed residual 81 bool m_written; 82 void (*m_callback)(const IterationController&); 83 public : 84 85 void init() 86 { 87 m_nit = 0; m_res = 0.0; m_written = false; 88 m_resminreach = 1E50; m_resadd = 0.0; 89 m_callback = 0; 90 } 91 92 IterationController(double r = 1.0E-8, int noi = 0, size_t mit = size_t(-1)) 93 : m_rhsn(1.0), m_maxiter(mit), m_noise(noi), m_resmax(r) { init(); } 94 95 void operator ++(int) { m_nit++; m_written = false; m_resadd += m_res; } 96 void operator ++() { (*this)++; } 97 98 bool first() { return m_nit == 0; } 99 100 /* get/set the "noisyness" (verbosity) of the solvers */ 101 int noiseLevel() const { return m_noise; } 102 void setNoiseLevel(int n) { m_noise = n; } 103 void reduceNoiseLevel() { if (m_noise > 0) m_noise--; } 104 105 double maxResidual() const { return m_resmax; } 106 void setMaxResidual(double r) { m_resmax = r; } 107 108 double residual() const { return m_res; } 109 110 /* change the user-definable callback, called after each iteration */ 111 void setCallback(void (*t)(const IterationController&)) 112 { 113 m_callback = t; 114 } 115 116 size_t iteration() const { return m_nit; } 117 void setIteration(size_t i) { m_nit = i; } 118 119 size_t maxIterarions() const { return m_maxiter; } 120 void setMaxIterations(size_t i) { m_maxiter = i; } 121 122 double rhsNorm() const { return m_rhsn; } 123 void setRhsNorm(double r) { m_rhsn = r; } 124 125 bool converged() const { return m_res <= m_rhsn * m_resmax; } 126 bool converged(double nr) 127 { 128 using std::abs; 129 m_res = abs(nr); 130 m_resminreach = (std::min)(m_resminreach, m_res); 131 return converged(); 132 } 133 template<typename VectorType> bool converged(const VectorType &v) 134 { return converged(v.squaredNorm()); } 135 136 bool finished(double nr) 137 { 138 if (m_callback) m_callback(*this); 139 if (m_noise > 0 && !m_written) 140 { 141 converged(nr); 142 m_written = true; 143 } 144 return (m_nit >= m_maxiter || converged(nr)); 145 } 146 template <typename VectorType> 147 bool finished(const MatrixBase<VectorType> &v) 148 { return finished(double(v.squaredNorm())); } 149 150 }; 151 152 } // end namespace Eigen 153 154 #endif // EIGEN_ITERATION_CONTROLLER_H 155
