POD_example_00003.cpp

POD leave-1-out error map computation using voloctree. This example uses the leave-1-out cross-validation method to compute the reconstruction error map starting from a database of simulations defined on the same mesh. It evaluates also the bounding box containing all those cells whose error is equal or greater than an assigned threshold. To run: ./POD_example_00003
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POD leave-1-out error map computation using voloctree. This example uses the leave-1-out cross-validation method to compute the reconstruction error map starting from a database of simulations defined on the same mesh. It evaluates also the bounding box containing all those cells whose error is equal or greater than an assigned threshold. To run: ./POD_example_00003

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 *  bitpit
 *
 *  Copyright (C) 2015-2021 OPTIMAD engineering Srl
 *
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 *  This file is part of bitpit.
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 *  bitpit is free software: you can redistribute it and/or modify it
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 *  as published by the Free Software Foundation.
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 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 *  License for more details.
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#include <array>
#if BITPIT_ENABLE_MPI
#include <mpi.h>
#endif
 
#include "pod.hpp"
 
using namespace bitpit;
 
void run()
{
    POD pod;
 
    for (int i=0; i<10; i++)
        pod.addSnapshot("./data", "test."+std::to_string(i));
 
    pod.setMeshType(POD::MeshType::VOLOCTREE);
    pod.setStaticMesh(true); 
    pod.setUseMean(false);
    pod.setWriteMode(POD::WriteMode::DEBUG);
    pod.setMemoryMode(POD::MemoryMode::MEMORY_NORMAL);
    pod.setEnergyLevel(99);
    
    pod.setDirectory("pod");
    pod.setName("pod.test.solver");    
 
    for (int i=0; i<5; i++)
        pod.removeLeave1outSnapshot("./data", "test."+std::to_string(2*i));
    
    pod.leave1out();
    
    std::vector<std::string> namesf {"rho","rho_e"};
    std::vector<std::array<std::string,3>> namevf {}; //{{"u_x", "u_y","u_z"}};  
    pod.setTargetErrorFields(namesf,namevf);
 
    pod.setErrorThreshold(0.001);
    
    pod.evalErrorBoundingBox();
}
 
int main(int argc, char *argv[]) 
{
#if BITPIT_ENABLE_MPI
    MPI_Init(&argc,&argv);
#endif    
 
    try {
        run();
    } catch (const std::exception &exception) {
        log::cout() << exception.what();
        exit(1);
    }
 
#if BITPIT_ENABLE_MPI
    MPI_Finalize();
#endif
 
}