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 ECOCRANDOMDENSEENCODER_H__ 00012 #define ECOCRANDOMDENSEENCODER_H__ 00013 00014 #include <shogun/multiclass/ecoc/ECOCEncoder.h> 00015 00016 namespace shogun 00017 { 00018 00022 class CECOCRandomDenseEncoder: public CECOCEncoder 00023 { 00024 public: 00032 CECOCRandomDenseEncoder(int32_t maxiter=10000, int32_t codelen=0, float64_t pposone=0.5); 00033 00035 virtual ~CECOCRandomDenseEncoder() {} 00036 00040 void set_probability(float64_t pposone); 00041 00043 virtual const char* get_name() const { return "ECOCRandomDenseEncoder"; } 00044 00048 virtual SGMatrix<int32_t> create_codebook(int32_t num_classes); 00049 00059 int32_t get_default_code_length(int32_t num_classes) const 00060 { 00061 return static_cast<int32_t>(CMath::round(10 * CMath::log(num_classes))); 00062 } 00063 00064 protected: 00065 int32_t m_maxiter; 00066 int32_t m_codelen; 00067 float64_t m_pposone; 00068 00069 private: 00073 bool check_probability(float64_t pposone) 00074 { 00075 if (pposone >= 0.999 || pposone <= 0.0001) 00076 return false; 00077 return true; 00078 } 00079 00081 void init(); 00082 }; 00083 00084 } // namespace shogun 00085 00086 #endif /* end of include guard: ECOCRANDOMDENSEENCODER_H__ */ 00087
