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//=====================================================
// Copyright (C) 2012 Andrea Arteaga <andyspiros@gmail.com>
//=====================================================
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
#ifndef ACCURACY_HPP
#define ACCURACY_HPP
#include "timers/LinuxTimer.hpp"
#include <string>
#include <vector>
#include <cmath>
template<class Action>
void bench_accuracy (int size_min, int size_max, int nb_point,
bool silent = false)
{
std::string filename = "accuracy_"+Action::name()+".dat";
if (!silent)
std::cout << "starting " << filename << std::endl;
// Initialization vectors
std::vector<double> errors(nb_point);
std::vector<double> devs(nb_point);
std::vector<int> sizes(nb_point);
// Initialization timer
LinuxTimer timer;
// Log-distributed sizes
size_lin_log(nb_point, size_min, size_max, sizes);
// Loop on sizes
for (int i = nb_point-1; i >= 0; --i) {
const int size = sizes[i];
if (!silent)
std::cout << " " << "size = " << size << ", " << std::flush;
int repetitions = 0;
double average = 0., stddev = 0., e;
// Perform time loop and store average and standard deviation
timer.start();
do {
// Initialize action with given size and new seed
Action action(size, 15+repetitions);
e = action.getResidual();
average += e;
stddev += e*e;
++repetitions;
} while(timer.elapsed() < 1. || repetitions < 4);
// Compute average and standard deviation
// (sometimes strange things happen)
average /= repetitions;
stddev = std::sqrt(std::fabs(stddev/repetitions - average*average));
errors[i] = average;
devs[i] = stddev;
// Output
if (!silent)
std::cout << "average = " << average << ", stddev = " << stddev
<< " (" << repetitions << " samples)" << std::endl;
}
// Dump the result
if (!silent) {
std::ofstream outfile(filename.c_str());
// Don't dump the stddev for now
for (int i = 0; i < nb_point; ++i)
//outfile << sizes[i] << " " << errors[i] << " " << devs[i] << "\n";
outfile << sizes[i] << " " << errors[i] << "\n";
outfile.close();
}
}
#endif // ACCURACY_HPP
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