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#ifndef ROL_BARZILAIBORWEIN_H
#define ROL_BARZILAIBORWEIN_H
/** \class ROL::BarzilaiBorwein
\brief Provides definitions for Barzilai-Borwein operators.
*/
#include "ROL_Secant.hpp"
namespace ROL {
template<class Real>
class BarzilaiBorwein : public Secant<Real> {
private:
int type_;
public:
BarzilaiBorwein(int type = 1) : Secant<Real>(1), type_(type) {}
// Apply lBFGS Approximate Inverse Hessian
void applyH( Vector<Real> &Hv, const Vector<Real> &v ) const {
// Get Generic Secant State
const Teuchos::RCP<SecantState<Real> >& state = Secant<Real>::get_state();
Hv.set(v.dual());
if ( state->iter != 0 && state->current != -1 ) {
if ( type_ == 1 ) {
Real yy = state->gradDiff[state->current]->dot(*(state->gradDiff[state->current]));
Hv.scale(state->product[state->current]/yy);
}
else if ( type_ == 2 ) {
Real ss = state->iterDiff[state->current]->dot(*(state->iterDiff[state->current]));
Hv.scale(ss/state->product[state->current]);
}
}
}
// Apply lBFGS Approximate Hessian
void applyB( Vector<Real> &Bv, const Vector<Real> &v ) const {
// Get Generic Secant State
const Teuchos::RCP<SecantState<Real> >& state = Secant<Real>::get_state();
Bv.set(v.dual());
if ( state->iter != 0 && state->current != -1 ) {
if ( type_ == 1 ) {
Real yy = state->gradDiff[state->current]->dot(*(state->gradDiff[state->current]));
Bv.scale(yy/state->product[state->current]);
}
else if ( type_ == 2 ) {
Real ss = state->iterDiff[state->current]->dot(*(state->iterDiff[state->current]));
Bv.scale(state->product[state->current]/ss);
}
}
}
};
}
#endif
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