00001 /* 00002 * This program is free software; you can redistribute it and/or modify 00003 * it under the terms of the GNU General Public License as published by 00004 * the Free Software Foundation; either version 3 of the License, or 00005 * (at your option) any later version. 00006 * 00007 * Written (W) 2012 Chiyuan Zhang 00008 * Copyright (C) 2012 Chiyuan Zhang 00009 */ 00010 00011 #ifndef SHAREBOOST_H__ 00012 #define SHAREBOOST_H__ 00013 00014 #include <shogun/machine/LinearMulticlassMachine.h> 00015 #include <shogun/multiclass/MulticlassOneVsRestStrategy.h> 00016 #include <shogun/features/DenseFeatures.h> 00017 #include <shogun/labels/MulticlassLabels.h> 00018 00019 namespace shogun 00020 { 00021 00030 class CShareBoost: public CLinearMulticlassMachine 00031 { 00032 public: 00034 CShareBoost(); 00035 00037 CShareBoost(CDenseFeatures<float64_t> *features, CMulticlassLabels *labs, int32_t num_nonzero_feas); 00038 00040 virtual ~CShareBoost() {} 00041 00043 virtual const char* get_name() const { return "ShareBoost"; } 00044 00046 void set_num_nonzero_feas(int32_t n) { m_nonzero_feas = n; } 00047 00049 int32_t get_num_nonzero_feas() const { return m_nonzero_feas; } 00050 00052 void set_features(CFeatures *f); 00053 00055 SGVector<int32_t> get_activeset(); 00056 00057 friend class ShareBoostOptimizer; 00058 protected: 00059 00061 virtual bool train_machine(CFeatures* data = NULL); 00062 00063 private: 00064 void init_sb_params(); 00065 00066 void compute_rho(); 00067 int32_t choose_feature(); 00068 void optimize_coefficients(); 00069 void compute_pred(); 00070 void compute_pred(const float64_t *W); 00071 00072 int32_t m_nonzero_feas; 00073 SGVector<int32_t> m_activeset; 00074 00075 SGMatrix<float64_t> m_fea; 00076 SGMatrix<float64_t> m_rho; 00077 SGVector<float64_t> m_rho_norm; 00078 SGMatrix<float64_t> m_pred; 00079 }; 00080 00081 } /* shogun */ 00082 00083 #endif /* end of include guard: SHAREBOOST_H__ */ 00084
