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CrossEntropy.h
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1// @(#)root/tmva $Id$
2// Author: Andreas Hoecker, Joerg Stelzer, Helge Voss, Kai Voss
3
4/**********************************************************************************
5 * Project: TMVA - a Root-integrated toolkit for multivariate data analysis *
6 * Package: TMVA *
7 * Class : CrossEntropy *
8 * Web : http://tmva.sourceforge.net *
9 * *
10 * Description: Implementation of the CrossEntropy as separation criterion *
11 * *
12 * Authors (alphabetical): *
13 * Andreas Hoecker <Andreas.Hocker@cern.ch> - CERN, Switzerland *
14 * Helge Voss <Helge.Voss@cern.ch> - MPI-K Heidelberg, Germany *
15 * Kai Voss <Kai.Voss@cern.ch> - U. of Victoria, Canada *
16 * *
17 * Copyright (c) 2005: *
18 * CERN, Switzerland *
19 * U. of Victoria, Canada *
20 * Heidelberg U., Germany *
21 * *
22 * Redistribution and use in source and binary forms, with or without *
23 * modification, are permitted according to the terms listed in LICENSE *
24 * (http://tmva.sourceforge.net/LICENSE) *
25 **********************************************************************************/
26
27#ifndef ROOT_TMVA_CrossEntropy
28#define ROOT_TMVA_CrossEntropy
29
30//////////////////////////////////////////////////////////////////////////
31// //
32// CrossEntropy //
33// //
34// Implementation of the CrossEntropy as separation criterion //
35// -p log (p) - (1-p)log(1-p); p=purity = s/(s+b) //
36// //
37//////////////////////////////////////////////////////////////////////////
38
39#include "TMVA/SeparationBase.h"
40
41namespace TMVA {
42
44
45 public:
46
47 // default constructor
49
50 // copy constructor
52
53 // destructor
54 virtual ~CrossEntropy(){}
55
56 // return the separation Index -p log (p) - (1-p)log(1-p); p=purity = s/(s+b)
57 virtual Double_t GetSeparationIndex( const Double_t s, const Double_t b );
58
59 protected:
60
61 ClassDef(CrossEntropy,0); // Implementation of the CrossEntropy as separation criterion
62 };
63
64} // namespace TMVA
65
66#endif
67
#define b(i)
Definition: RSha256.hxx:100
#define g(i)
Definition: RSha256.hxx:105
double Double_t
Definition: RtypesCore.h:59
#define ClassDef(name, id)
Definition: Rtypes.h:325
Implementation of the CrossEntropy as separation criterion.
Definition: CrossEntropy.h:43
CrossEntropy(const CrossEntropy &g)
Definition: CrossEntropy.h:51
virtual ~CrossEntropy()
Definition: CrossEntropy.h:54
virtual Double_t GetSeparationIndex(const Double_t s, const Double_t b)
Cross Entropy defined as:
An interface to calculate the "SeparationGain" for different separation criteria used in various trai...
static constexpr double s
create variable transformations