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Reference Guide
MethodFDA.h
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1 // @(#)root/tmva $Id$
2 // Author: Andreas Hoecker, Peter Speckmayer
3 
4 /**********************************************************************************
5  * Project: TMVA - a Root-integrated toolkit for multivariate data analysis *
6  * Package: TMVA *
7  * Class : MethodFDA *
8  * Web : http://tmva.sourceforge.net *
9  * *
10  * Description: *
11  * Function discriminant analysis (FDA). This simple classifier *
12  * fits any user-defined TFormula (via option configuration string) to *
13  * the training data by requiring a formula response of 1 (0) to signal *
14  * (background) events. The parameter fitting is done via the abstract *
15  * class FitterBase, featuring Monte Carlo sampling, Genetic *
16  * Algorithm, Simulated Annealing, MINUIT and combinations of these. *
17  * *
18  * Authors (alphabetical): *
19  * Andreas Hoecker <Andreas.Hocker@cern.ch> - CERN, Switzerland *
20  * Peter Speckmayer <speckmay@mail.cern.ch> - CERN, Switzerland *
21  * *
22  * Copyright (c) 2005-2010: *
23  * CERN, Switzerland *
24  * MPI-K Heidelberg, Germany *
25  * *
26  * Redistribution and use in source and binary forms, with or without *
27  * modification, are permitted according to the terms listed in LICENSE *
28  * (http://tmva.sourceforge.net/LICENSE) *
29  **********************************************************************************/
30 
31 #ifndef ROOT_TMVA_MethodFDA
32 #define ROOT_TMVA_MethodFDA
33 
34 //////////////////////////////////////////////////////////////////////////
35 // //
36 // MethodFDA //
37 // //
38 // Function discriminant analysis (FDA). This simple classifier //
39 // fits any user-defined TFormula (via option configuration string) to //
40 // the training data by requiring a formula response of 1 (0) to signal //
41 // (background) events. The parameter fitting is done via the abstract //
42 // class FitterBase, featuring Monte Carlo sampling, Genetic //
43 // Algorithm, Simulated Annealing, MINUIT and combinations of these. //
44 // //
45 // Can compute one-dimensional regression //
46 // //
47 //////////////////////////////////////////////////////////////////////////
48 
49 #include "TMVA/MethodBase.h"
50 #include "TMVA/IFitterTarget.h"
51 
52 class TFormula;
53 
54 namespace TMVA {
55 
56  class Interval;
57  class Event;
58  class FitterBase;
59 
60  class MethodFDA : public MethodBase, public IFitterTarget {
61 
62  public:
63 
64  MethodFDA( const TString& jobName,
65  const TString& methodTitle,
66  DataSetInfo& theData,
67  const TString& theOption = "");
68 
69  MethodFDA( DataSetInfo& theData,
70  const TString& theWeightFile);
71 
72  virtual ~MethodFDA( void );
73 
74  Bool_t HasAnalysisType( Types::EAnalysisType type, UInt_t numberClasses, UInt_t numberTargets );
75 
76  // training method
77  void Train( void );
78 
80 
81  void AddWeightsXMLTo ( void* parent ) const;
82 
83  void ReadWeightsFromStream( std::istream & i );
84  void ReadWeightsFromXML ( void* wghtnode );
85 
86  // calculate the MVA value
87  Double_t GetMvaValue( Double_t* err = 0, Double_t* errUpper = 0 );
88 
89  virtual const std::vector<Float_t>& GetRegressionValues();
90  virtual const std::vector<Float_t>& GetMulticlassValues();
91 
92  void Init( void );
93 
94  // ranking of input variables
95  const Ranking* CreateRanking() { return 0; }
96 
97  Double_t EstimatorFunction( std::vector<Double_t>& );
98 
99  // no check of options at this place
100  void CheckSetup() {}
101 
102  protected:
103 
104  // make ROOT-independent C++ class for classifier response (classifier-specific implementation)
105  void MakeClassSpecific( std::ostream&, const TString& ) const;
106 
107  // get help message text
108  void GetHelpMessage() const;
109 
110  private:
111 
112  // compute multiclass values
113  void CalculateMulticlassValues( const TMVA::Event*& evt, std::vector<Double_t>& parameters, std::vector<Float_t>& values);
114 
115 
116  // create and interpret formula expression and compute estimator
117  void CreateFormula ();
118  Double_t InterpretFormula( const Event*, std::vector<Double_t>::iterator begin, std::vector<Double_t>::iterator end );
119 
120  // clean up
121  void ClearAll();
122 
123  // print fit results
124  void PrintResults( const TString&, std::vector<Double_t>&, const Double_t ) const;
125 
126  // the option handling methods
127  void DeclareOptions();
128  void ProcessOptions();
129 
130  TString fFormulaStringP; // string with function
131  TString fParRangeStringP; // string with ranges of parameters
132  TString fFormulaStringT; // string with function
133  TString fParRangeStringT; // string with ranges of parameters
134 
135  TFormula* fFormula; // the discrimination function
136  UInt_t fNPars; // number of parameters
137  std::vector<Interval*> fParRange; // ranges of parameters
138  std::vector<Double_t> fBestPars; // the pars that optimise (minimise) the estimator
139  TString fFitMethod; // estimator optimisation method
140  TString fConverger; // fitmethod uses fConverger as intermediate step to converge into local minimas
141  FitterBase* fFitter; // the fitter used in the training
142  IFitterTarget* fConvergerFitter; // intermediate fitter
143 
144 
145  // sum of weights (this should become centrally available through the dataset)
146  Double_t fSumOfWeightsSig; // sum of weights (signal)
147  Double_t fSumOfWeightsBkg; // sum of weights (background)
148  Double_t fSumOfWeights; // sum of weights
149 
150  //
151  Int_t fOutputDimensions; // number of output values
152 
153  ClassDef(MethodFDA,0); // Function Discriminant Analysis
154  };
155 
156 } // namespace TMVA
157 
158 #endif // MethodFDA_H
void Init(void)
default initialisation
Definition: MethodFDA.cxx:124
Double_t fSumOfWeightsBkg
Definition: MethodFDA.h:147
void DeclareOptions()
define the options (their key words) that can be set in the option string
Definition: MethodFDA.cxx:163
void ClearAll()
delete and clear all class members
Definition: MethodFDA.cxx:346
Base class for TMVA fitters.
Definition: FitterBase.h:51
EAnalysisType
Definition: Types.h:127
Virtual base Class for all MVA method.
Definition: MethodBase.h:109
Double_t InterpretFormula(const Event *, std::vector< Double_t >::iterator begin, std::vector< Double_t >::iterator end)
formula interpretation
Definition: MethodFDA.cxx:499
Basic string class.
Definition: TString.h:131
void CreateFormula()
translate formula string into TFormula, and parameter string into par ranges
Definition: MethodFDA.cxx:183
Ranking for variables in method (implementation)
Definition: Ranking.h:48
MethodFDA(const TString &jobName, const TString &methodTitle, DataSetInfo &theData, const TString &theOption="")
standard constructor
Definition: MethodFDA.cxx:86
int Int_t
Definition: RtypesCore.h:41
bool Bool_t
Definition: RtypesCore.h:59
void CheckSetup()
check may be overridden by derived class (sometimes, eg, fitters are used which can only be implement...
Definition: MethodFDA.h:100
TString fFormulaStringP
Definition: MethodFDA.h:130
TString fFitMethod
Definition: MethodFDA.h:139
std::vector< Double_t > fBestPars
Definition: MethodFDA.h:138
#define ClassDef(name, id)
Definition: Rtypes.h:320
Double_t GetMvaValue(Double_t *err=0, Double_t *errUpper=0)
returns MVA value for given event
Definition: MethodFDA.cxx:518
std::vector< Interval * > fParRange
Definition: MethodFDA.h:137
TString fConverger
Definition: MethodFDA.h:140
FitterBase * fFitter
Definition: MethodFDA.h:141
Class that contains all the data information.
Definition: DataSetInfo.h:60
TString fFormulaStringT
Definition: MethodFDA.h:132
void PrintResults(const TString &, std::vector< Double_t > &, const Double_t) const
display fit parameters check maximum length of variable name
Definition: MethodFDA.cxx:421
Bool_t HasAnalysisType(Types::EAnalysisType type, UInt_t numberClasses, UInt_t numberTargets)
FDA can handle classification with 2 classes and regression with one regression-target.
Definition: MethodFDA.cxx:334
TFormula * fFormula
Definition: MethodFDA.h:135
void GetHelpMessage() const
get help message text
Definition: MethodFDA.cxx:721
const Ranking * CreateRanking()
Definition: MethodFDA.h:95
void MakeClassSpecific(std::ostream &, const TString &) const
write FDA-specific classifier response
Definition: MethodFDA.cxx:676
void CalculateMulticlassValues(const TMVA::Event *&evt, std::vector< Double_t > &parameters, std::vector< Float_t > &values)
calculate the values for multiclass
Definition: MethodFDA.cxx:581
The Formula class.
Definition: TFormula.h:83
unsigned int UInt_t
Definition: RtypesCore.h:42
IFitterTarget * fConvergerFitter
Definition: MethodFDA.h:142
void ReadWeightsFromXML(void *wghtnode)
read coefficients from xml weight file
Definition: MethodFDA.cxx:637
void Train(void)
FDA training.
Definition: MethodFDA.cxx:363
void ProcessOptions()
the option string is decoded, for available options see "DeclareOptions"
Definition: MethodFDA.cxx:240
TString fParRangeStringP
Definition: MethodFDA.h:131
void AddWeightsXMLTo(void *parent) const
create XML description for LD classification and regression (for arbitrary number of output classes/t...
Definition: MethodFDA.cxx:619
double Double_t
Definition: RtypesCore.h:55
int type
Definition: TGX11.cxx:120
Double_t EstimatorFunction(std::vector< Double_t > &)
compute estimator for given parameter set (to be minimised)
Definition: MethodFDA.cxx:435
void ReadWeightsFromStream(std::istream &i)
read back the training results from a file (stream)
Definition: MethodFDA.cxx:604
Int_t fOutputDimensions
Definition: MethodFDA.h:151
Double_t fSumOfWeightsSig
Definition: MethodFDA.h:146
Abstract ClassifierFactory template that handles arbitrary types.
TString fParRangeStringT
Definition: MethodFDA.h:133
virtual const std::vector< Float_t > & GetRegressionValues()
Definition: MethodFDA.cxx:530
virtual const std::vector< Float_t > & GetMulticlassValues()
Definition: MethodFDA.cxx:553
Double_t fSumOfWeights
Definition: MethodFDA.h:148
Interface for a fitter &#39;target&#39;.
Definition: IFitterTarget.h:44
virtual void ReadWeightsFromStream(std::istream &)=0
virtual ~MethodFDA(void)
destructor
Definition: MethodFDA.cxx:326
Function discriminant analysis (FDA).
Definition: MethodFDA.h:60