10 #ifndef ROL_BACKTRACKING_H
11 #define ROL_BACKTRACKING_H
34 rho_ = parlist.sublist(
"Step").sublist(
"Line Search").sublist(
"Line-Search Method").get(
"Backtracking Rate",half);
43 void run( Real &alpha, Real &fval,
int &ls_neval,
int &ls_ngrad,
46 Real tol = std::sqrt(ROL_EPSILON<Real>());
59 while ( !
LineSearch<Real>::status(
LINESEARCH_BACKTRACKING,ls_neval,ls_ngrad,alpha,fold,gs,fval,*
xnew_,s,obj,con) ) {
Provides the interface to evaluate objective functions.
void run(Real &alpha, Real &fval, int &ls_neval, int &ls_ngrad, const Real &gs, const Vector< Real > &s, const Vector< Real > &x, Objective< Real > &obj, BoundConstraint< Real > &con)
void updateIterate(Vector< Real > &xnew, const Vector< Real > &x, const Vector< Real > &s, Real alpha, BoundConstraint< Real > &con)
void initialize(const Vector< Real > &x, const Vector< Real > &s, const Vector< Real > &g, Objective< Real > &obj, BoundConstraint< Real > &con)
virtual Real getInitialAlpha(int &ls_neval, int &ls_ngrad, const Real fval, const Real gs, const Vector< Real > &x, const Vector< Real > &s, Objective< Real > &obj, BoundConstraint< Real > &con)
virtual ROL::Ptr< Vector > clone() const =0
Clone to make a new (uninitialized) vector.
virtual Real value(const Vector< Real > &x, Real &tol)=0
Compute value.
Defines the linear algebra or vector space interface.
virtual void update(const Vector< Real > &x, UpdateType type, int iter=-1)
Update objective function.
BackTracking(ROL::ParameterList &parlist)
Provides interface for and implements line searches.
Implements a simple back tracking line search.
Provides the interface to apply upper and lower bound constraints.
ROL::Ptr< Vector< Real > > xnew_
virtual void initialize(const Vector< Real > &x, const Vector< Real > &s, const Vector< Real > &g, Objective< Real > &obj, BoundConstraint< Real > &con)