step/fletcher/test_01.cpp

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// @HEADER
// *****************************************************************************
//               Rapid Optimization Library (ROL) Package
//
// Copyright 2014 NTESS and the ROL contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

 
#include "ROL_SimpleEqConstrained.hpp"
#include "ROL_OptimizationProblem.hpp"
#include "ROL_OptimizationSolver.hpp"
#include "ROL_Fletcher.hpp"
 
#include "ROL_Stream.hpp"
#include "ROL_GlobalMPISession.hpp"
 
 
#include <iostream>
 
typedef double RealT;
 
int main(int argc, char *argv[]) {
 
  ROL::GlobalMPISession mpiSession(&argc, &argv);
 
  std::string filename = "input.xml";
  
  auto parlist = ROL::getParametersFromXmlFile( filename );
 
  using Opt     = ROL::OptimizationProblem<RealT>;
  using V       = ROL::Vector<RealT>;
 
  // This little trick lets us print to std::cout only if a (dummy) command-line argument is provided.
  int iprint     = argc - 1;
  ROL::Ptr<std::ostream> outStream;
  ROL::nullstream bhs; // outputs nothing
  if (iprint > 0)
    outStream = ROL::makePtrFromRef(std::cout);
  else
    outStream = ROL::makePtrFromRef(bhs);
 
  // Save the format state of the original std::cout.
  ROL::nullstream oldFormatState;
  oldFormatState.copyfmt(std::cout);
 
  int errorFlag  = 0;
 
  // *** Test body.
 
  try {
 
    // Set up optimization problem
    ROL::Ptr<V> x;
    std::vector<ROL::Ptr<V> > sol;
    ROL::Ptr<Opt> optProb;
    ROL::ZOO::getSimpleEqConstrained<RealT> SEC;
    SEC.get( optProb, x, sol );
    ROL::Ptr<V> error = x->clone();
 
    // Solve optimization problem
    ROL::OptimizationSolver<RealT> optSolver(*optProb, *parlist);
    optSolver.solve(*outStream);
 
    error->set(*sol[0]);
    error->axpy(static_cast<RealT>(-1), *x);
    RealT solnErr = error->norm();
 
    *outStream << "Distance from true solution: " << solnErr << "\n";
 
    errorFlag += (solnErr < static_cast<RealT>(1e-6)) ? 0 : 1;
  }
  catch (std::logic_error& err) {
    *outStream << err.what() << "\n";
    errorFlag = -1000;
  }; // end try
 
  if (errorFlag != 0)
    std::cout << "End Result: TEST FAILED\n";
  else
    std::cout << "End Result: TEST PASSED\n";
 
  // reset format state of std::cout
  std::cout.copyfmt(oldFormatState);
 
  return 0;
}