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0001 // @(#)root/tmva $Id$ 0002 // Author: Andreas Hoecker, Joerg Stelzer, Helge Voss, Kai Voss 0003 0004 /********************************************************************************** 0005 * Project: TMVA - a Root-integrated toolkit for multivariate data analysis * 0006 * Package: TMVA * 0007 * Class : CrossEntropy * 0008 * * 0009 * * 0010 * Description: Implementation of the CrossEntropy as separation criterion * 0011 * * 0012 * Authors (alphabetical): * 0013 * Andreas Hoecker <Andreas.Hocker@cern.ch> - CERN, Switzerland * 0014 * Helge Voss <Helge.Voss@cern.ch> - MPI-K Heidelberg, Germany * 0015 * Kai Voss <Kai.Voss@cern.ch> - U. of Victoria, Canada * 0016 * * 0017 * Copyright (c) 2005: * 0018 * CERN, Switzerland * 0019 * U. of Victoria, Canada * 0020 * Heidelberg U., Germany * 0021 * * 0022 * Redistribution and use in source and binary forms, with or without * 0023 * modification, are permitted according to the terms listed in LICENSE * 0024 * (see tmva/doc/LICENSE) * 0025 **********************************************************************************/ 0026 0027 #ifndef ROOT_TMVA_CrossEntropy 0028 #define ROOT_TMVA_CrossEntropy 0029 0030 ////////////////////////////////////////////////////////////////////////// 0031 // // 0032 // CrossEntropy // 0033 // // 0034 // Implementation of the CrossEntropy as separation criterion // 0035 // -p log (p) - (1-p)log(1-p); p=purity = s/(s+b) // 0036 // // 0037 ////////////////////////////////////////////////////////////////////////// 0038 0039 #include "TMVA/SeparationBase.h" 0040 0041 namespace TMVA { 0042 0043 class CrossEntropy : public SeparationBase { 0044 0045 public: 0046 0047 // default constructor 0048 CrossEntropy(): SeparationBase() { fName = "CE"; } 0049 0050 // copy constructor 0051 CrossEntropy( const CrossEntropy& g): SeparationBase(g) {} 0052 0053 // destructor 0054 virtual ~CrossEntropy(){} 0055 0056 // return the separation Index -p log (p) - (1-p)log(1-p); p=purity = s/(s+b) 0057 virtual Double_t GetSeparationIndex( const Double_t s, const Double_t b ); 0058 0059 protected: 0060 0061 ClassDef(CrossEntropy,0); // Implementation of the CrossEntropy as separation criterion 0062 }; 0063 0064 } // namespace TMVA 0065 0066 #endif 0067
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