/**   orboost.h: implement the ORBoost algorithm (Lin and Li 2006)   for ordinal regression   (c) 2006-2007 Hsuan-Tien Lin**/#ifndef __LEMGA_AGGRANK_ORBOOST_H__#define __LEMGA_AGGRANK_ORBOOST_H__#include "aggrank.h"namespace lemga {  class ORBoost : public AggRank {  public:    enum {FORM_LR, FORM_FULL};  protected:    UINT form;    bool ordered;    UINT sub_iter;    REAL reg_param;  public:    explicit ORBoost (UINT _n_rank = 2): AggRank(_n_rank), form(FORM_LR), ordered(true), sub_iter(1), reg_param(0.0) {}    explicit ORBoost (std::istream& is) { is >> *this; }    virtual const id_t& id () const;    virtual ORBoost* create () const { return new ORBoost(); }    virtual ORBoost* clone () const { return new ORBoost(*this); }    void set_form (UINT _form) { form = _form; }    void set_ordered (bool _ordered) { ordered = _ordered; }    void set_sub_iter (UINT _sub_iter) { sub_iter = _sub_iter; }    void set_reg_param (REAL _reg_param) { reg_param = _reg_param; }  public:    virtual void train ();  private:    void update_with_dec(vREAL& thres_now, vREAL& rholeft, vREAL& rhoright, REAL& sum_rhodiff, REAL& obj);    REAL compute_w(pLearnModel plm, vREAL& rholeft, vREAL& rhoright);  };} // namespace lemga#ifdef  __ORBOOST_H__#warning "This header file may conflict with another `orboost.h' file."#endif#define __ORBOOST_H__#endif