package liblinear;

// origin: tron.h
public interface Function {

   // double fun(double *w);
   // void grad(double *w, double *g);
   // void Hv(double *s, double *Hs);

   double fun( double[] w );

   void grad( double[] w, double[] g );

   void Hv( double[] s, double[] Hs );

   int get_nr_variable();
}