MVAComputer.h

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#ifndef CondFormats_PhysicsToolsObjects_MVAComputer_h
#define CondFormats_PhysicsToolsObjects_MVAComputer_h
// -*- C++ -*-
//
// Package:     PhysicsToolsObjects
// Class  :     MVAComputer
//

//
// Author:  Christophe Saout <christophe.saout@cern.ch>
// Created:     Sat Apr 24 15:18 CEST 2007
// $Id: MVAComputer.h,v 1.15 2010/01/26 19:40:03 saout Exp $
//

#include "CondFormats/Serialization/interface/Serializable.h"

#include <memory>
#include <string>
#include <vector>
#include <map>

#include "CondFormats/PhysicsToolsObjects/interface/Histogram.h"

namespace PhysicsTools {
namespace Calibration {

// helper classes

class BitSet {
    public:
    // help that poor ROOT to copy bitsets... (workaround)
    BitSet &operator = (const BitSet &other)
    { store = other.store; bitsInLast = other.bitsInLast; return *this; }

    std::vector<unsigned char>  store;
    unsigned int            bitsInLast;

  COND_SERIALIZABLE;
};

class Matrix {
    public:
    std::vector<double>     elements;
    unsigned int            rows;
    unsigned int            columns;

  COND_SERIALIZABLE;
};

// configuration base classes

class VarProcessor {
    public:
    BitSet  inputVars;

    virtual ~VarProcessor() {}
    virtual std::string getInstanceName() const;
        virtual std::unique_ptr<VarProcessor> clone() const;

  COND_SERIALIZABLE;
};

class Variable {
    public:
    inline Variable() {}
    inline Variable(const std::string &name) : name(name) {}
    inline ~Variable() {}

    std::string         name;

  COND_SERIALIZABLE;
};

// variable processors

class ProcOptional : public VarProcessor {
    public:
        std::unique_ptr<VarProcessor> clone() const override;
    std::vector<double>     neutralPos;

  COND_SERIALIZABLE;
};

class ProcCount : public VarProcessor {
    public:
        std::unique_ptr<VarProcessor> clone() const override;
  COND_SERIALIZABLE;
};

class ProcClassed : public VarProcessor {
    public:
        std::unique_ptr<VarProcessor> clone() const override;
    unsigned int            nClasses;

  COND_SERIALIZABLE;
};

class ProcSplitter : public VarProcessor {
    public:
        std::unique_ptr<VarProcessor> clone() const override;
    unsigned int            nFirst;

  COND_SERIALIZABLE;
};

class ProcForeach : public VarProcessor {
    public:
        std::unique_ptr<VarProcessor> clone() const override;
    unsigned int            nProcs;

  COND_SERIALIZABLE;
};

class ProcSort : public VarProcessor {
    public:
        std::unique_ptr<VarProcessor> clone() const override;
    unsigned int            sortByIndex;
    bool                descending;

  COND_SERIALIZABLE;
};

class ProcCategory : public VarProcessor {
    public:
        std::unique_ptr<VarProcessor> clone() const override;
    typedef std::vector<double> BinLimits;

    std::vector<BinLimits>      variableBinLimits;
    std::vector<int>        categoryMapping;

  COND_SERIALIZABLE;
};

class ProcNormalize : public VarProcessor {
    public:
        std::unique_ptr<VarProcessor> clone() const override;
    std::vector<HistogramF>     distr;
    int             categoryIdx;

  COND_SERIALIZABLE;
};

class ProcLikelihood : public VarProcessor {
    public:
        std::unique_ptr<VarProcessor> clone() const override;
    class SigBkg {
        public:
        HistogramF      background;
        HistogramF      signal;
        bool            useSplines;
    
  COND_SERIALIZABLE;
};

    std::vector<SigBkg>     pdfs;
    std::vector<double>     bias;
    int             categoryIdx;
    bool                logOutput;
    bool                individual;
    bool                neverUndefined;
    bool                keepEmpty;

  COND_SERIALIZABLE;
};

class ProcLinear : public VarProcessor {
    public:
        std::unique_ptr<VarProcessor> clone() const override;
    std::vector<double>     coeffs;
    double              offset;

  COND_SERIALIZABLE;
};

class ProcMultiply : public VarProcessor {
    public:
        std::unique_ptr<VarProcessor> clone() const override;
    typedef std::vector<unsigned int>   Config;

    unsigned int            in;
    std::vector<Config>     out;

  COND_SERIALIZABLE;
};

class ProcMatrix : public VarProcessor {
    public:
        std::unique_ptr<VarProcessor> clone() const override;
    Matrix              matrix;

  COND_SERIALIZABLE;
};

class ProcExternal : public VarProcessor {
    public:
        std::unique_ptr<VarProcessor> clone() const override;
    std::string getInstanceName() const override;

    std::string         method;
    std::vector<unsigned char>  store;

  COND_SERIALIZABLE;
};

class ProcMLP : public VarProcessor {
    public:
        std::unique_ptr<VarProcessor> clone() const override;
    typedef std::pair<double, std::vector<double> > Neuron;
    typedef std::pair<std::vector<Neuron>, bool>    Layer;

    std::vector<Layer>      layers;

  COND_SERIALIZABLE;
};

// the discriminator computer

class MVAComputer {
    public:
    MVAComputer();
    MVAComputer(const MVAComputer &orig);
    virtual ~MVAComputer();

    MVAComputer &operator = (const MVAComputer &orig);

    virtual std::vector<VarProcessor*> getProcessors() const;
    void addProcessor(const VarProcessor *proc);

    // cacheId stuff to detect changes
    typedef unsigned int CacheId;
    inline CacheId getCacheId() const { return cacheId; }
    inline bool changed(CacheId old) const { return old != cacheId; }

    std::vector<Variable>       inputSet;
    unsigned int            output;

    private:
    std::vector<VarProcessor*>  processors;

    CacheId             cacheId COND_TRANSIENT; // transient

  COND_SERIALIZABLE;
};

// a collection of computers identified by name

class MVAComputerContainer {
    public:
    typedef std::pair<std::string, MVAComputer> Entry;

    MVAComputerContainer();
    virtual ~MVAComputerContainer() {}

    MVAComputer &add(const std::string &label);
    virtual const MVAComputer &find(const std::string &label) const;
    virtual bool contains(const std::string &label) const;

    // cacheId stuff to detect changes
    typedef unsigned int CacheId;
    inline CacheId getCacheId() const { return cacheId; }
    inline bool changed(CacheId old) const { return old != cacheId; }

    private:
    std::vector<Entry>  entries;

    CacheId         cacheId COND_TRANSIENT; // transient

  COND_SERIALIZABLE;
};

} // namespace Calibration
} // namespace PhysicsTools

#endif // CondFormats_PhysicsToolsObjects_MVAComputer_h