SvmTheoreticalSpectrumGenerator.h

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// --------------------------------------------------------------------------
//                   OpenMS -- Open-Source Mass Spectrometry
// --------------------------------------------------------------------------
// Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
// ETH Zurich, and Freie Universitaet Berlin 2002-2018.
//
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//    may be used to endorse or promote products derived from this software
//    without specific prior written permission.
// For a full list of authors, refer to the file AUTHORS.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// $Maintainer: Timo Sachsenberg $
// $Authors: Sandro Andreotti $
// --------------------------------------------------------------------------


#pragma once

#include <OpenMS/config.h>
#include <OpenMS/CHEMISTRY/TheoreticalSpectrumGenerator.h>
#include <OpenMS/ANALYSIS/SVM/SVMWrapper.h>

#include <OpenMS/KERNEL/StandardDeclarations.h>
#include <OpenMS/KERNEL/StandardTypes.h>
#include <OpenMS/KERNEL/MSSpectrum.h>
#include <OpenMS/KERNEL/MSExperiment.h>

#include <boost/random/mersenne_twister.hpp>



namespace OpenMS
{
  class OPENMS_DLLAPI SvmTheoreticalSpectrumGenerator :
    public DefaultParamHandler
  {
    friend class SvmTheoreticalSpectrumGeneratorTrainer;
public:

    struct IonType
    {
      Residue::ResidueType residue;
      EmpiricalFormula loss;
      Int charge;

      //Default constructor
      IonType() :
        residue((Residue::ResidueType) 0),
        loss(),
        charge(0)
      {
      }

      //Custom constructor
      IonType(Residue::ResidueType local_residue, EmpiricalFormula local_loss = EmpiricalFormula(), Int local_charge = 1) :
        residue(local_residue),
        loss(local_loss),
        charge(local_charge)
      {
      }

      //Copy constructor
      IonType(const IonType & rhs) :
        residue(rhs.residue),
        loss(rhs.loss),
        charge(rhs.charge)
      {
      }

      //Assignment operator
      IonType & operator=(const IonType & rhs)
      {
        if (this != &rhs)
        {
          residue = rhs.residue;
          loss = rhs.loss;
          charge = rhs.charge;
        }
        return *this;
      }

      bool operator<(const IonType & rhs) const
      {
        if (residue != rhs.residue)
          return residue < rhs.residue;
        else if (loss.toString() != rhs.loss.toString())
          return loss.toString() < rhs.loss.toString();
        else
          return charge < rhs.charge;
      }

    };

    struct DescriptorSet
    {
      typedef std::vector<svm_node> DescriptorSetType;
      DescriptorSetType descriptors;
    };


    struct SvmModelParameterSet
    {
      //pointers to the svm classification models (one per ion_type)
      std::vector<boost::shared_ptr<SVMWrapper> > class_models;

      //pointers to the svm regression models (one per ion_type)
      std::vector<boost::shared_ptr<SVMWrapper> > reg_models;

      //The intensity for each ion type for the SVC mode
      std::map<Residue::ResidueType, double> static_intensities;

      //The selected primary IonTypes
      std::vector<IonType> ion_types;

      //The selected secondary IonTypes
      std::map<IonType, std::vector<IonType> > secondary_types;

      //The number of intensity levels
      Size number_intensity_levels;

      //The number of regions for every spectrum
      Size number_regions;

      //upper limits (required for scaling)
      std::vector<double> feature_max;

      //lower limits (required for scaling)
      std::vector<double> feature_min;

      //lower bound for scaling
      double scaling_lower;

      //upper bound for scaling
      double scaling_upper;

      //border values for binning secondary types intensity
      std::vector<double> intensity_bin_boarders;

      //intensity values for binned secondary types intensity
      std::vector<double> intensity_bin_values;

      //conditional probabilities for secondary types
      std::map<std::pair<IonType, Size>, std::vector<std::vector<double> > > conditional_prob;
    };



    SvmTheoreticalSpectrumGenerator();

    SvmTheoreticalSpectrumGenerator(const SvmTheoreticalSpectrumGenerator & source);

    SvmTheoreticalSpectrumGenerator & operator=(const SvmTheoreticalSpectrumGenerator & tsg);


    ~SvmTheoreticalSpectrumGenerator() override;


    void simulate(PeakSpectrum & spectrum, const AASequence & peptide, boost::random::mt19937_64& rng, Size precursor_charge);

    void load();

    const std::vector<IonType> & getIonTypes()
    {
      return mp_.ion_types;
    }

protected:
    typedef std::map<IonType, double> IntensityMap;

    Size precursor_charge_;

    SvmModelParameterSet mp_;

    static std::map<String, Size> aa_to_index_;

    static std::map<String, double> hydrophobicity_;

    static std::map<String, double> helicity_;

    static std::map<String, double> basicity_;

    std::map<IonType, bool> hide_type_;

    inline void scaleSingleFeature_(double & value, double feature_min, double feature_max, double lower = -1.0, double upper = 1.0);

    void scaleDescriptorSet_(DescriptorSet & desc, double lower, double upper);

    Size generateDescriptorSet_(AASequence peptide, Size position, IonType type, Size precursor_charge, DescriptorSet & desc_set);

    String ResidueTypeToString_(Residue::ResidueType type);

    static void initializeMaps_();

    static bool initializedMaps_;

    void updateMembers_() override;
  };

  void inline SvmTheoreticalSpectrumGenerator::scaleSingleFeature_(double & value, double lower, double upper, double feature_min, double feature_max)
  {
    double prev = value;
    if (feature_max == feature_min)
    {
      return;
    }

    if (value <= feature_min)
    {
      value = lower;
    }
    else if (value >= feature_max)
    {
      value = upper;
    }
    else
    {
      value = lower + (upper - lower) *
              (value - feature_min) /
              (feature_max - feature_min);
    }

    if (value < 0)
    {
      std::cerr << "negative value!! " << value << "  l: " << lower << " u: " << upper << " fm: " << feature_min << " fma: " << feature_max << "  prev: " << prev << std::endl;
    }
  }

} // namespace OpenMS