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// NOX: An Object-Oriented Nonlinear Solver Package
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#ifndef NOX_LINESEARCH_BACKTRACK_H
#define NOX_LINESEARCH_BACKTRACK_H
#include "NOX_LineSearch_Generic.H" // base class
#include "NOX_Abstract_Vector.H" // for NOX::Abstract::Vector::NormType
#include "Teuchos_RCP.hpp"
// Forward declarations
namespace NOX {
class Utils;
namespace MeritFunction {
class Generic;
}
}
namespace NOX {
namespace LineSearch {
//! Generic backtracking line search.
/*! This line search starts with the step length defined by "Default
Step". It checks to see if the norm of the right hand side (RHS) has
been reduced. If so, it exits successfully. Otherwise, it reduces
the step length by the reduction factor (defaults to one-half). It
continues to repeat this procedure until it either finds a reduction
in the norm of the RHS or the step is less than that specified by
"Minimum Step". In the later case, the line search has failed, and
we take the step defined by "Recovery Step".
This line search can be called via NOX::LineSearch::Manager.
The following parameters can be specified for this line search in
the "Backtrack" sublist of the "Line Search" sublist.
<ul>
<li> "Default Step" - starting step length (defaults to 1.0)
<li> "Minimum Step" - minimum acceptable step length (defaults to 1.0e-12)
<li> "Recovery Step" - step to take when the line search fails
(defaults to value for "Default Step")
<li> "Max Iters" - maximum number of iterations (i.e., RHS computations)
<li> "Reduction Factor" - A multiplier between zero and one that reduces the step size between line search iterations
</ul>
*/
class Backtrack : public Generic {
public:
//! Constructor
Backtrack(const Teuchos::RCP<NOX::GlobalData>& gd,
Teuchos::ParameterList& params);
//! Destructor
~Backtrack();
// derived
bool reset(const Teuchos::RCP<NOX::GlobalData>& gd,
Teuchos::ParameterList& params);
// derived
bool compute(NOX::Abstract::Group& newgrp, double& step,
const NOX::Abstract::Vector& dir,
const NOX::Solver::Generic& s);
private:
//! Printing Utilities
Teuchos::RCP<NOX::Utils> utils;
//! Merit function
Teuchos::RCP<NOX::MeritFunction::Generic> meritFunctionPtr;
//! Minimum step length (i.e., when we give up)
double minStep;
//! Default step
double defaultStep;
//! Default step for linesearch failure
double recoveryStep;
double reductionFactor;
//! Maximum number of iterations
int maxIters;
};
} // namespace LineSearch
} // namespace NOX
#endif
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