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svm.h

#ifndef _LIBSVM_H
#define _LIBSVM_H

#ifdef __cplusplus
extern "C" {
#endif

struct svm_node
{
      int index;
      double value;
};

struct svm_problem
{
      int l;
      double *y;
      struct svm_node **x;
};

enum { C_SVC, NU_SVC, ONE_CLASS, EPSILON_SVR, NU_SVR };     /* svm_type */
enum { LINEAR, POLY, RBF, SIGMOID, PRECOMPUTED }; /* kernel_type */

struct svm_parameter
{
      int svm_type;
      int kernel_type;
      int degree; /* for poly */
      double gamma;     /* for poly/rbf/sigmoid */
      double coef0;     /* for poly/sigmoid */

      /* these are for training only */
      double cache_size; /* in MB */
      double eps; /* stopping criteria */
      double C;   /* for C_SVC, EPSILON_SVR and NU_SVR */
      int nr_weight;          /* for C_SVC */
      int *weight_label;      /* for C_SVC */
      double* weight;         /* for C_SVC */
      double nu;  /* for NU_SVC, ONE_CLASS, and NU_SVR */
      double p;   /* for EPSILON_SVR */
      int shrinking;    /* use the shrinking heuristics */
      int probability; /* do probability estimates */
};

struct svm_model *svm_train(const struct svm_problem *prob, const struct svm_parameter *param);
void svm_cross_validation(const struct svm_problem *prob, const struct svm_parameter *param, int nr_fold, double *target);

int svm_save_model(const char *model_file_name, const struct svm_model *model);
struct svm_model *svm_load_model(const char *model_file_name);

int svm_get_svm_type(const struct svm_model *model);
int svm_get_nr_class(const struct svm_model *model);
void svm_get_labels(const struct svm_model *model, int *label);
double svm_get_svr_probability(const struct svm_model *model);

void svm_predict_values(const struct svm_model *model, const struct svm_node *x, double* dec_values);
double svm_predict(const struct svm_model *model, const struct svm_node *x);
double svm_predict_probability(const struct svm_model *model, const struct svm_node *x, double* prob_estimates);

void svm_destroy_model(struct svm_model *model);
void svm_destroy_param(struct svm_parameter *param);

const char *svm_check_parameter(const struct svm_problem *prob, const struct svm_parameter *param);
int svm_check_probability_model(const struct svm_model *model);

#ifdef __cplusplus
}
#endif

#endif /* _LIBSVM_H */

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