libopenms-dev 1.11.1-5 / usr / include / OpenMS / TRANSFORMATIONS / FEATUREFINDER / SimpleExtender.h

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// Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
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// $Maintainer: Clemens Groepl $
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#ifndef OPENMS_TRANSFORMATIONS_FEATUREFINDER_SIMPLEEXTENDER_H
#define OPENMS_TRANSFORMATIONS_FEATUREFINDER_SIMPLEEXTENDER_H

#include <OpenMS/TRANSFORMATIONS/FEATUREFINDER/FeaFiModule.h>
#include <OpenMS/MATH/STATISTICS/AveragePosition.h>

#include <queue>
#include <iostream>
#include <fstream>

namespace OpenMS
{

  /**
    @brief Simple feature extension algorithm

      This algorithm implements the extension phase of the FeatureFinder
      as described by Groepl et al. (2005)

      We want to determine a region around a seed that is
      provided by the seeder. Initially, this region is
      empty. The boundary of this region is implemented
      using a MutablePriorityQueue which contains only
      the seed at the beginning.

      At each step, we choose a data point from the boundary,
      move it into the region and explore the neigbourhood of
      this point in a cross-wise manner (m/z up, m/z down, rt up
  and rt down). During this exploration we compute the priority
      of all encountered points as a function of the distance from
      the extracted point. If this priority exceeds a threshold,
      we insert the corresponding point into the boundary and proceed.

      We stop the extension phase if all peaks contained in the
  boundary have an intensity lower than a threshold or are too
  distant from the centroid of the feature.

      @image html SimpleExtender.png

      @htmlinclude OpenMS_SimpleExtender.parameters

      @ingroup FeatureFinder
  */
  template <class PeakType, class FeatureType>
  class SimpleExtender :
    public FeaFiModule<PeakType, FeatureType>,
    public FeatureFinderDefs
  {
public:
    typedef FeaFiModule<PeakType, FeatureType> Base;

    /// Intensity of a data point
    typedef typename Base::IntensityType IntensityType;
    /// Coordinates of a point (m/z and rt)
    typedef typename Base::CoordinateType CoordinateType;
    /// Priority of a point (see below)
    typedef DoubleReal ProbabilityType;

    /// Constructor
    SimpleExtender(const MSExperiment<PeakType> * map, FeatureMap<FeatureType> * features, FeatureFinder * ff) :
      Base(map, features, ff),
      last_pos_extracted_()
    {
      this->setName("SimpleExtender");

      this->defaults_.setValue("dist_mz_up", 6.0, "Maximum high m/z distance of peak in the region/boundary from the seed.");
      this->defaults_.setMinFloat("dist_mz_up", 0.0);
      this->defaults_.setValue("dist_mz_down", 2.0, "Maximum low m/z distance of peak in the region/boundary from the seed.");
      this->defaults_.setMinFloat("dist_mz_down", 0.0);
      this->defaults_.setValue("dist_rt_up", 5.0, "Maximum high RT distance of peak in the region/boundary from the seed.");
      this->defaults_.setMinFloat("dist_rt_up", 0.0);
      this->defaults_.setValue("dist_rt_down", 5.0, "Maximum low RT distance of peak in the region/boundary from the seed.");
      this->defaults_.setMinFloat("dist_rt_down", 0.0);

      // priority check is per default switched off
      // these values were used for the Myoglobin quantification project
      // DON'T REMOVE THIS
      this->defaults_.setValue("priority_thr", -0.1, "Minimum priority for data points to be included into the boundary of the feature (default 0.0). The priority of a data point is a function of its intensity and its distance to the last point included into the feature region. Setting this threshold to zero or a very small value is usually a good idea.", StringList::create("advanced"));

      this->defaults_.setValue("intensity_factor", 0.03, "Influences for intensity (ion count) threshold in the feature extension. We include only raw data points into this region if their intensity is larger than [intensity_factor * (intensity of the seed)].");
      this->defaults_.setMinFloat("intensity_factor", 0.0);
      this->defaults_.setMaxFloat("intensity_factor", 1.0);

      this->defaultsToParam_();
    }

    /// destructor
    virtual ~SimpleExtender()
    {
    }

    /// return next seed
    void extend(const ChargedIndexSet & seed_region, ChargedIndexSet & result_region)
    {
      // empty region and boundary datastructures
      result_region.clear();
      priorities_.clear();
      running_avg_.clear();
      boundary_ = std::priority_queue<IndexWithPriority, std::vector<IndexWithPriority>, typename IndexWithPriority::PriorityLess>();

#ifdef DEBUG_FEATUREFINDER
      std::vector<IndexPair> debug_vector;
#endif
      // find maximum of region (seed)
      CoordinateType max_intensity = 0.0;
      IndexPair seed;

      for (IndexSet::const_iterator citer = seed_region.begin(); citer != seed_region.end(); ++citer)
      {
        if (this->getPeakIntensity(*citer) > max_intensity)
        {
          seed = *citer;
          max_intensity = this->getPeakIntensity(seed);
        }
      }

      // remember last extracted point (in this case the seed !)
      last_pos_extracted_[Peak2D::RT] = this->getPeakRt(seed);
      last_pos_extracted_[Peak2D::MZ] = this->getPeakMz(seed);

      // Add peaks received from seeder directly to boundary
      for (IndexSet::const_iterator citer = seed_region.begin(); citer != seed_region.end(); ++citer)
      {
        ProbabilityType priority = computePeakPriority_(*citer);
        priorities_[*citer] = priority;
        boundary_.push(IndexWithPriority(*citer, priority));
      }
      // pass on charge information
      result_region.charge = seed_region.charge;

      // re-compute intensity threshold
      intensity_threshold_ = (DoubleReal)(this->param_).getValue("intensity_factor") * this->getPeakIntensity(seed);

#ifdef DEBUG_FEATUREFINDER
      std::cout << "\n";
      std::cout << "Extending from " << this->getPeakRt(seed) << "/" << this->getPeakMz(seed) << std::endl;
      std::cout << "Intensity of seed " << this->getPeakIntensity(seed);
      std::cout << " (" << seed.first << "/" << seed.second << ")" << std::endl;
      std::cout << "Intensity_threshold: " << intensity_threshold_ << std::endl;
#endif

      while (!boundary_.empty())
      {
        // remove peak with highest priority
        const IndexPair  current_index = boundary_.top().index;
        boundary_.pop();

        //  check for corrupt index
        OPENMS_PRECONDITION(current_index.first < (*this->map_).size(), "Scan index outside of map!");
        OPENMS_PRECONDITION(current_index.second < (*this->map_)[current_index.first].size(), "Peak index outside of scan!");

        // remember last extracted peak
        last_pos_extracted_[Peak2D::RT] = this->getPeakRt(current_index);
        last_pos_extracted_[Peak2D::MZ] = this->getPeakMz(current_index);

        // Now we explore the neighbourhood of the current peak. Points in this area are included
        // into the boundary if their intensity is not too low and they are not too
        // far away from the seed.
        // Add position to the current average of positions weighted by intensity
        running_avg_.add(last_pos_extracted_, this->getPeakIntensity(current_index));

        // explore neighbourhood of current peak
        moveMzUp_(current_index);
        moveMzDown_(current_index);
        moveRtUp_(current_index);
        moveRtDown_(current_index);

        // set peak flags and add to boundary
        this->ff_->getPeakFlag(current_index) = USED;
#ifdef DEBUG_FEATUREFINDER
        debug_vector.push_back(current_index);
#endif
        result_region.insert(current_index);

      }       // end of while ( !boundary_.empty() )

#ifdef DEBUG_FEATUREFINDER
      std::cout << "Feature region size: " << result_region.size() << std::endl;
#endif

#ifdef DEBUG_FEATUREFINDER
      static UInt number = 1;
      writeDebugFile_(debug_vector, number++);
      debug_vector.clear();
#endif

      return;
    }     // end of extend

    /**
     @brief A helper structure to sort indizes by their priority.

     This structure is used to keep track of the boundary of a
     feature. After a peak is found during the extension phase,
     we compute its priority (which is dependant on its distance from
     the point that was the last to be extracted from the boundary
     and its intensity). If this priority is large enough, we include
     the point into the boundary. The boundary (which is implemented
     as mutable priority queue) sorts the peaks by this priority.

    */
    struct IndexWithPriority
    {
      IndexWithPriority(const FeatureFinderDefs::IndexPair & i, DoubleReal p) :
        index(i),
        priority(p)
      {
      }

      IndexPair index;
      ProbabilityType priority;

      ///Compares two indizes by priority.
      struct PriorityLess
      {
        inline bool operator()(const IndexWithPriority & x, const IndexWithPriority & y) const
        {
          return x.priority < y.priority;
        }

      };
    };

protected:

    virtual void updateMembers_()
    {
      dist_mz_up_ = this->param_.getValue("dist_mz_up");
      dist_mz_down_ = this->param_.getValue("dist_mz_down");
      dist_rt_up_ = this->param_.getValue("dist_rt_up");
      dist_rt_down_ = this->param_.getValue("dist_rt_down");
      priority_threshold_ = this->param_.getValue("priority_thr");
    }

    /// write DTA2D debug file for the feature with index @p nr_feat
    void writeDebugFile_(const std::vector<IndexPair> & peaks, UInt nr_feat)
    {
      String filename = String(nr_feat).fillLeft('0', 4) + "_Extension.dta2d";
      std::ofstream file(filename.c_str());
      for (Size i = 0; i < peaks.size(); ++i)
      {
        file << this->getPeakRt(peaks[i]) << " " << this->getPeakMz(peaks[i]) << " " << peaks.size() - i << std::endl;
      }
      file.close();
    }

    /// Checks if the current peak is too far from the centroid
    bool isTooFarFromCentroid_(const IndexPair & index)
    {
      //Corrupt index
      OPENMS_PRECONDITION(index.first < (*this->map_).size(), "Scan index outside of map!");
      OPENMS_PRECONDITION(index.second < (*this->map_)[index.first].size(), "Peak index outside of scan!");

      const DPosition<2> & curr_mean = running_avg_.getPosition();

      if (this->getPeakMz(index) > curr_mean[Peak2D::MZ] + dist_mz_up_   ||
          this->getPeakMz(index) < curr_mean[Peak2D::MZ] - dist_mz_down_ ||
          this->getPeakRt(index) > curr_mean[Peak2D::RT] + dist_rt_up_   ||
          this->getPeakRt(index) < curr_mean[Peak2D::RT] - dist_rt_down_)
      {
        //too far
        return true;
      }

      //close enough
      return false;
    }

    /// Extends the seed into positive m/z direction
    void moveMzUp_(const IndexPair & index)
    {
      try
      {
        IndexPair tmp = index;
        while (true)
        {
          this->getNextMz(tmp);
          if (isTooFarFromCentroid_(tmp)) break;
          checkNeighbour_(tmp);
        }
      }
      catch (NoSuccessor)
      {
      }
    }

    /// Extends the seed into negative m/z direction
    void moveMzDown_(const IndexPair & index)
    {
      try
      {
        IndexPair tmp = index;
        while (true)
        {
          this->getPrevMz(tmp);
          if (isTooFarFromCentroid_(tmp)) break;
          checkNeighbour_(tmp);
        }
      }
      catch (NoSuccessor)
      {
      }
    }

    /// Extension into positive rt dimension
    void moveRtUp_(const IndexPair & index)
    {
      try
      {
        IndexPair tmp = index;

        while (true)
        {
          this->getNextRt(tmp);
          if (isTooFarFromCentroid_(tmp)) break;
          checkNeighbour_(tmp);
        }
      }
      catch (NoSuccessor)
      {
      }
    }

    /// Extends the seed into negative retention time direction
    void moveRtDown_(const IndexPair & index)
    {
      try
      {
        IndexPair tmp = index;
        while (true)
        {
          this->getPrevRt(tmp);
          if (isTooFarFromCentroid_(tmp)) break;
          checkNeighbour_(tmp);
        }
      }
      catch (NoSuccessor)
      {
      }
    }

    /// Computes the priority of a peak as function of intensity and distance from seed.
    ProbabilityType computePeakPriority_(const IndexPair & index)
    {
      return (*this->map_)[index.first][index.second].getIntensity();
    }

    /// Checks the neighbours of the current for insertion into the boundary.
    void checkNeighbour_(const IndexPair & index)
    {
      //Corrupt index
      OPENMS_PRECONDITION(index.first < (*this->map_).size(), "Scan index outside of map!");
      OPENMS_PRECONDITION(index.second < (*this->map_)[index.first].size(), "Peak index outside of scan!");

      // skip this point if its intensity is too low
      if (this->getPeakIntensity(index) <= intensity_threshold_)
      {
        return;
      }
      if (this->ff_->getPeakFlag(index) == UNUSED)
      {
        DoubleReal pr_new = computePeakPriority_(index);

        if (pr_new > priority_threshold_)
        {
          //std::map<IndexPair, DoubleReal>::iterator piter = priorities_.find(index);
          this->ff_->getPeakFlag(index) = USED;
          priorities_[index] = pr_new;
          boundary_.push(IndexWithPriority(index, pr_new));
        }
      }
    }

    /// keeps an running average of the peak coordinates weighted by the intensities
    Math::AveragePosition<2> running_avg_;

    /// Keeps track of peaks already included in the boundary (value is priority of peak)
    std::map<IndexPair, ProbabilityType> priorities_;

    /// Position of last peak extracted from the boundary (used to compute the priority of neighbouring peaks)
    DPosition<2> last_pos_extracted_;

    /// Represents the boundary of a feature
    std::priority_queue<IndexWithPriority, std::vector<IndexWithPriority>, typename IndexWithPriority::PriorityLess> boundary_;

    /// Mininum intensity of a boundary point. Calculated from 'intensity_factor' and the seed intensity
    IntensityType intensity_threshold_;

    /// Maximum distance to seed in positive m/z
    CoordinateType dist_mz_up_;
    /// Maximum distance to seed in negative m/z
    CoordinateType dist_mz_down_;
    /// Maximum distance to seed in positive retention time
    CoordinateType dist_rt_up_;
    /// Maximum distance to seed in negative retention time
    CoordinateType dist_rt_down_;

    /// Minium priority for points in the feature region (priority is function of intensity and distance to seed)
    ProbabilityType priority_threshold_;

    /// charged index set
    ChargedIndexSet region_;

private:
    /// Not implemented
    SimpleExtender();
    /// Not implemented
    SimpleExtender & operator=(const SimpleExtender &);
    /// Not implemented
    SimpleExtender(const SimpleExtender &);

  };
}
#endif // OPENMS_TRANSFORMATIONS_FEATUREFINDER_SIMPLEEXTENDER_H