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// $Id$ |
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/* |
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Copyright (C) 2009, 2012 Peter Johansson |
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This file is part of the yat library, http://dev.thep.lu.se/yat |
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The yat library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License as |
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published by the Free Software Foundation; either version 3 of the |
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License, or (at your option) any later version. |
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The yat library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with yat. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#include <config.h> |
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#include "SvmMultiClass.h" |
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#include "KernelLookup.h" |
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#include "yat/utility/Matrix.h" |
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#include "yat/utility/VectorConstView.h" |
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#include "yat/utility/VectorView.h" |
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#include <cassert> |
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#include <limits> |
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namespace theplu { |
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namespace yat { |
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namespace classifier { |
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SvmMultiClass::SvmMultiClass(void) |
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{} |
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double SvmMultiClass::C(void) const |
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{ |
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return prototype_.C(); |
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} |
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SvmMultiClass* SvmMultiClass::make_classifier(void) const |
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{ |
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return new SvmMultiClass(*this); |
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} |
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unsigned long int SvmMultiClass::max_epochs(void) const |
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{ |
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return prototype_.max_epochs(); |
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} |
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void SvmMultiClass::max_epochs(unsigned long int n) |
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{ |
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prototype_.max_epochs(n); |
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} |
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void SvmMultiClass::predict(const KernelLookup& input, |
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utility::Matrix& prediction) const |
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{ |
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assert(svm_.size()); |
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prediction.resize(svm_.size(),input.columns(), |
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std::numeric_limits<double>::quiet_NaN()); |
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for (size_t i=0; i<svm_.size(); ++i) { |
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if (svm_[i].trained()) { |
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yat::utility::Matrix tmp; |
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svm_[i].predict(input, tmp); |
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prediction.row_view(i) = tmp.row_const_view(0); |
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} |
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} |
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} |
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void SvmMultiClass::set_C(double c) |
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{ |
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prototype_.set_C(c); |
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} |
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void SvmMultiClass::train(const KernelLookup& kernel, const Target& targ) |
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{ |
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svm_.clear(); |
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svm_.resize(targ.nof_classes(), prototype_); |
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Target target(targ); |
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for (size_t i=0; i<target.nof_classes(); ++i) |
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target.set_binary(i, false); |
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for (size_t i=0; i<target.nof_classes(); ++i) { |
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if (target.size(i)) { |
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target.set_binary(i, true); |
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svm_[i].train(kernel, target); |
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target.set_binary(i, false); |
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} |
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else { |
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svm_[i].reset(); // don't train empty class |
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} |
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} |
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} |
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}}} // of namespace classifier, yat, and theplu |