mosesdecoder/mert/PerScorer.h

#ifndef __PERSCORER_H__
#define __PERSCORER_H__

#include <algorithm>
#include <cmath>
#include <iostream>
#include <iterator>
#include <set>
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>
#include "Types.h"
#include "ScoreData.h"
#include "Scorer.h"


using namespace std;

/**
  * Implementation of position-independent word error rate. This is defined
  * as 1 - (correct - max(0,output_length - ref_length)) / ref_length
  * In fact, we ignore the " 1 - " so that it can be maximised.
 **/
class PerScorer: public StatisticsBasedScorer
{
public:
  PerScorer(const string& config = "") : StatisticsBasedScorer("PER",config) {}
  virtual void setReferenceFiles(const vector<string>& referenceFiles);
  virtual void prepareStats(size_t sid, const string& text, ScoreStats& entry);

  virtual void whoami() {
    cerr << "I AM PerScorer" << std::endl;
  }

  size_t NumberOfScores() {
    // cerr << "PerScorer: 3" << endl;
    return 3;
  };

//protected:

  virtual float calculateScore(const vector<int>& comps) ;

private:

  //no copy
  PerScorer(const PerScorer&);
  ~PerScorer() {};
  PerScorer& operator=(const PerScorer&);

  // data extracted from reference files
  vector<size_t> _reflengths;
  vector<multiset<int> > _reftokens;
};

#endif //__PERSCORER_H