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// $Id$ |
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/* |
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Copyright (C) 2006 Jari Häkkinen, Peter Johansson, Markus Ringnér |
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Copyright (C) 2007 Peter Johansson, Markus Ringnér |
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Copyright (C) 2008 Jari Häkkinen, Peter Johansson |
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Copyright (C) 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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|
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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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|
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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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|
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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 "SNRScore.h" |
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#include "Averager.h" |
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#include "AveragerWeighted.h" |
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#include "yat/classifier/DataLookupWeighted1D.h" |
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#include "yat/classifier/Target.h" |
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#include "yat/utility/VectorBase.h" |
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#include <cassert> |
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|
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namespace theplu { |
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namespace yat { |
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namespace statistics { |
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|
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SNRScore::SNRScore(bool b) |
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: Score(b) |
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{ |
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} |
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|
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SNRScore::~SNRScore(void) |
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{ |
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} |
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|
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double SNRScore::score(const classifier::Target& target, |
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const utility::VectorBase& value) const |
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{ |
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statistics::Averager positive; |
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statistics::Averager negative; |
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for(size_t i=0; i<target.size(); i++){ |
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if (target.binary(i)) |
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positive.add(value(i)); |
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else |
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negative.add(value(i)); |
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} |
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double diff = positive.mean() - negative.mean(); |
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double denom=positive.std()+negative.std(); |
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double snr=diff/denom; |
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if(positive.n()==0 || negative.n()==0) |
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snr=0; |
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if (snr<0 && absolute_) |
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snr=-snr; |
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return snr; |
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} |
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|
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double SNRScore::score(const classifier::Target& target, |
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const classifier::DataLookupWeighted1D& value) const |
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{ |
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statistics::AveragerWeighted positive; |
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statistics::AveragerWeighted negative; |
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for(size_t i=0; i<target.size(); i++){ |
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if (target.binary(i)) |
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positive.add(value.data(i),value.weight(i)); |
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else |
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negative.add(value.data(i),value.weight(i)); |
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} |
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double diff = positive.mean() - negative.mean(); |
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double denom=positive.std()+negative.std(); |
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assert(denom); |
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double snr=diff/denom; |
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if(positive.sum_w()==0 || negative.sum_w()==0) |
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snr=0; |
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if (snr<0 && absolute_) |
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snr=-snr; |
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return snr; |
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} |
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|
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|
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|
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double SNRScore::score(const classifier::Target& target, |
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const utility::VectorBase& value, |
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const utility::VectorBase& weight) const |
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{ |
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statistics::AveragerWeighted positive; |
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statistics::AveragerWeighted negative; |
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for(size_t i=0; i<target.size(); i++){ |
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if (target.binary(i)) |
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positive.add(value(i),weight(i)); |
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else |
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negative.add(value(i),weight(i)); |
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} |
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double diff = positive.mean() - negative.mean(); |
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double denom=positive.std()+negative.std(); |
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assert(denom); |
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double snr=diff/denom; |
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if(positive.sum_w()==0 || negative.sum_w()==0) |
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snr=0; |
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if (snr<0 && absolute_) |
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snr=-snr; |
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return snr; |
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} |
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|
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}}} // of namespace statistics, yat, and theplu |