LPBoost.h

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/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * Written (W) 2007-2009 Soeren Sonnenburg
 * Copyright (C) 2007-2009 Fraunhofer Institute FIRST and Max-Planck-Society
 */

#ifndef _LPBOOST_H___
#define _LPBOOST_H___

#include <shogun/lib/config.h>
#ifdef USE_CPLEX

#include <stdio.h>
#include <shogun/lib/common.h>
#include <shogun/lib/DynamicArray.h>

#include <shogun/features/Features.h>
#include <shogun/features/SparseFeatures.h>
#include <shogun/machine/LinearMachine.h>

namespace shogun
{
class CLPBoost : public CLinearMachine
{
    public:
        MACHINE_PROBLEM_TYPE(PT_BINARY);

        CLPBoost();
        virtual ~CLPBoost();

        virtual EMachineType get_classifier_type()
        {
            return CT_LPBOOST;
        }

        bool init(int32_t num_vec);
        void cleanup();

        virtual void set_features(CDotFeatures* feat)
        {
            if (feat->get_feature_class() != C_SPARSE ||
                feat->get_feature_type() != F_DREAL)
                SG_ERROR("LPBoost requires SPARSE REAL valued features\n");

            CLinearMachine::set_features(feat);
        }

        inline void set_C(float64_t c_neg, float64_t c_pos) { C1=c_neg; C2=c_pos; }

        inline float64_t get_C1() { return C1; }
        inline float64_t get_C2() { return C2; }

        inline void set_bias_enabled(bool enable_bias) { use_bias=enable_bias; }
        inline bool get_bias_enabled() { return use_bias; }

        inline void set_epsilon(float64_t eps) { epsilon=eps; }
        inline float64_t get_epsilon() { return epsilon; }

        float64_t find_max_violator(int32_t& max_dim);

        virtual const char* get_name() const { return "LPBoost"; }

    protected:
        virtual bool train_machine(CFeatures* data=NULL);

    protected:
        float64_t C1;
        float64_t C2;
        bool use_bias;
        float64_t epsilon;

        float64_t* u;
        CDynamicArray<int32_t>* dim;

        int32_t num_sfeat;
        int32_t num_svec;
        SGSparseVector<float64_t>* sfeat;

};
}
#endif //USE_CPLEX
#endif //_LPBOOST_H___