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#ifndef _LBFGS_H_
#define _LBFGS_H_
//template<class FuncGrad>
//std::vector<double>
//perform_LBFGS(FuncGrad func_grad, const std::vector<double> & x0);
std::vector<double>
perform_LBFGS(double (*func_grad)(const std::vector<double> &, std::vector<double> &),
const std::vector<double> & x0);
std::vector<double>
perform_OWLQN(double (*func_grad)(const std::vector<double> &, std::vector<double> &),
const std::vector<double> & x0,
const double C);
//const int LBFGS_M = 7;
const int LBFGS_M = 10;
#endif
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