step/test_03.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
 
#define USE_HESSVEC 1
 
#include "ROL_GetTestProblems.hpp"
#include "ROL_OptimizationSolver.hpp"
#include "ROL_Stream.hpp"
#include "Teuchos_GlobalMPISession.hpp"
 
 
#include <iostream>
 
typedef double RealT;
 
int main(int argc, char *argv[]) {
 
  Teuchos::GlobalMPISession mpiSession(&argc, &argv);
 
  // 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);
 
  int errorFlag  = 0;
 
  // *** Test body.
 
  try {
 
    std::string filename = "input.xml";
    
    auto parlist = ROL::getParametersFromXmlFile( filename );
    parlist->sublist("General").set("Inexact Hessian-Times-A-Vector",true);
#if USE_HESSVEC
    parlist->sublist("General").set("Inexact Hessian-Times-A-Vector",false);
#endif
    parlist->sublist("Step").set("Type","Line Search");
 
    for ( ROL::ETestOptProblem prob = ROL::TESTOPTPROBLEM_ROSENBROCK; prob < ROL::TESTOPTPROBLEM_LAST; prob++ ) { 
      // Get Objective Function
      ROL::Ptr<ROL::Vector<RealT> > x0;
      std::vector<ROL::Ptr<ROL::Vector<RealT> > > z;
      ROL::Ptr<ROL::OptimizationProblem<RealT> > problem;
      ROL::GetTestProblem<RealT>(problem,x0,z,prob);
 
      if (problem->getProblemType() == ROL::TYPE_B) {
        *outStream << "\n\n" << ROL:: ETestOptProblemToString(prob)  << "\n\n";
 
        // Get Dimension of Problem
        int dim = x0->dimension(); 
        parlist->sublist("General").sublist("Krylov").set("Iteration Limit", 2*dim);
 
        // Check Derivatives
        problem->check(*outStream);
 
        // Error Vector
        ROL::Ptr<ROL::Vector<RealT> > e = x0->clone();
        e->zero();
 
        //ROL::EDescent desc = ROL::DESCENT_STEEPEST; 
        ROL::EDescent desc = ROL::DESCENT_NEWTONKRYLOV; 
        parlist->sublist("Step").sublist("Line Search").sublist("Descent Method").set("Type", ROL::EDescentToString(desc));
        *outStream << std::endl << std::endl << ROL::EDescentToString(desc) << std::endl << std::endl;
        
        // Define Solver
        ROL::OptimizationSolver<RealT> solver(*problem,*parlist);
 
        // Run Solver
        solver.solve(*outStream);
 
        // Compute Error
        RealT err(0);
        for (int i = 0; i < static_cast<int>(z.size()); ++i) {
          e->set(*x0);
          e->axpy(-1.0,*z[i]);
          if (i == 0) {
            err = e->norm();
          }
          else {
            err = std::min(err,e->norm());
          }
        }
        *outStream << std::endl << "Norm of Error: " << err << std::endl;
      }
    }
  }
  catch (std::logic_error& err) {
    *outStream << err.what() << std::endl;
    errorFlag = -1000;
  }; // end try
 
  if (errorFlag != 0)
    std::cout << "End Result: TEST FAILED" << std::endl;
  else
    std::cout << "End Result: TEST PASSED" << std::endl;
 
  return 0;
 
}