PosteriorErrorProbabilityModel.h

Go to the documentation of this file.

// --------------------------------------------------------------------------
//                   OpenMS -- Open-Source Mass Spectrometry
// --------------------------------------------------------------------------
// Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
// ETH Zurich, and Freie Universitaet Berlin 2002-2018.
//
// This software is released under a three-clause BSD license:
//  * Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//  * Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//  * Neither the name of any author or any participating institution
//    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.
// --------------------------------------------------------------------------
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL ANY OF THE AUTHORS OR THE CONTRIBUTING
// INSTITUTIONS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// --------------------------------------------------------------------------
// $Maintainer: Timo Sachsenberg $
// $Authors: David Wojnar $
// --------------------------------------------------------------------------

#pragma once

#include <OpenMS/DATASTRUCTURES/DPosition.h>
#include <OpenMS/MATH/STATISTICS/GumbelDistributionFitter.h>
#include <OpenMS/MATH/STATISTICS/GaussFitter.h>
#include <OpenMS/DATASTRUCTURES/DefaultParamHandler.h>

#include <vector>
#include <map>

namespace OpenMS
{
  class String;
  class TextFile;
  class PeptideIdentification;
  class ProteinIdentification;
  class PeptideHit;
  namespace Math
  {


    class OPENMS_DLLAPI PosteriorErrorProbabilityModel :
      public DefaultParamHandler
    {
public:

      PosteriorErrorProbabilityModel();

      ~PosteriorErrorProbabilityModel() override;

      static std::map<String, std::vector<std::vector<double>>> extractAndTransformScores(
        const std::vector<ProteinIdentification> & protein_ids,
        const std::vector<PeptideIdentification> & peptide_ids,
        const bool split_charge,
        const bool top_hits_only,
        const bool target_decoy_available,
        const double fdr_for_targets_smaller);

      static void updateScores(
        const PosteriorErrorProbabilityModel & PEP_model,
        const String & search_engine,
        const Int charge,
        const bool prob_correct,
        const bool split_charge,
        std::vector<ProteinIdentification> & protein_ids,
        std::vector<PeptideIdentification> & peptide_ids,
        bool & unable_to_fit_data,
        bool & data_might_not_be_well_fit);

      bool fit(std::vector<double> & search_engine_scores);

      bool fit(std::vector<double> & search_engine_scores, std::vector<double> & probabilities);

      void fillDensities(std::vector<double> & x_scores, std::vector<double> & incorrect_density, std::vector<double> & correct_density);
      double computeMaxLikelihood(std::vector<double> & incorrect_density, std::vector<double> & correct_density);
      double one_minus_sum_post(std::vector<double> & incorrect_density, std::vector<double> & correct_density);
      double sum_post(std::vector<double> & incorrect_density, std::vector<double> & correct_density);
      double sum_pos_x0(std::vector<double> & x_scores, std::vector<double> & incorrect_density, std::vector<double> & correct_density);
      double sum_neg_x0(std::vector<double> & x_scores, std::vector<double> & incorrect_density, std::vector<double> & correct_density);
      double sum_pos_sigma(std::vector<double> & x_scores, std::vector<double> & incorrect_density, std::vector<double> & correct_density, double positive_mean);
      double sum_neg_sigma(std::vector<double> & x_scores, std::vector<double> & incorrect_density, std::vector<double> & correct_density, double positive_mean);


      GaussFitter::GaussFitResult getCorrectlyAssignedFitResult() const
      {
        return correctly_assigned_fit_param_;
      }

      GaussFitter::GaussFitResult getIncorrectlyAssignedFitResult() const
      {
        return incorrectly_assigned_fit_param_;
      }

      double getNegativePrior() const
      {
        return negative_prior_;
      }

      static double getGumbel_(double x, const GaussFitter::GaussFitResult & params)
      {
        double z = exp((params.x0 - x) / params.sigma);
        return (z * exp(-1 * z)) / params.sigma;
      }

      double computeProbability(double score) const;

      TextFile initPlots(std::vector<double> & x_scores);

      const String getGumbelGnuplotFormula(const GaussFitter::GaussFitResult & params) const;

      const String getGaussGnuplotFormula(const GaussFitter::GaussFitResult & params) const;

      const String getBothGnuplotFormula(const GaussFitter::GaussFitResult & incorrect, const GaussFitter::GaussFitResult & correct) const;

      void plotTargetDecoyEstimation(std::vector<double> & target, std::vector<double> & decoy);

      inline double getSmallestScore()
      {
        return smallest_score_;
      }

      void tryGnuplot(const String& gp_file);

private:
      static double transformScore_(const String & engine, const PeptideHit & hit);

      PosteriorErrorProbabilityModel & operator=(const PosteriorErrorProbabilityModel & rhs);
      PosteriorErrorProbabilityModel(const PosteriorErrorProbabilityModel & rhs);
      GaussFitter::GaussFitResult incorrectly_assigned_fit_param_;
      GaussFitter::GaussFitResult correctly_assigned_fit_param_;
      double negative_prior_;
      double max_incorrectly_;
      double max_correctly_;
      double smallest_score_;
      const String (PosteriorErrorProbabilityModel::* getNegativeGnuplotFormula_)(const GaussFitter::GaussFitResult & params) const;
      const String (PosteriorErrorProbabilityModel::* getPositiveGnuplotFormula_)(const GaussFitter::GaussFitResult & params) const;
    };
  }
}