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#ifndef _LBFGS_H_
#define _LBFGS_H_
#include <vector>
// 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 = 10;
#endif
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