RefsData.h

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//Copyright (c) 2012, University of Cambridge
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#ifndef REFSDATA_H_
#define REFSDATA_H_

#include <iostream>
#include <sstream>
#include <vector>
#include <string>
#include <limits>
#include <cstdlib>
#include <tr1/unordered_map>

#include "BleuStats.h"
#include "MertHashVec.h"
#include "MertCommon.h"

using std::min;
using std::max;
using std::vector;
using std::string;
using std::ostream;
using std::ostringstream;
using std::numeric_limits;

typedef unordered_map<NGram, unsigned int, hashfvecint64,
        hasheqvecint64> NGramToCountMap;

class RefsData {
  RefsData();
  NGram SubStr (const Sentence& s, const unsigned int n,
                const unsigned int l) const;
  unsigned int ClosestReferenceLength (const unsigned int hypLength) const;
  NGramToCountMap refCounts; // Counts of ngrams in the reference translations
  vector<unsigned int> refLengths; // Lengths of the reference translations
 public:
  typedef BleuStats ErrorStats;
  RefsData (const vector<Sentence>& refs);
  BleuStats ComputeBleuStats (const Sentence& hyp) const;
  string ToString (const char separator) const;
  static RefsData dummy;
};

typedef vector<RefsData> RefsDataIndex;

class IntegerEncRefs {
  RefsDataIndex refsData; // Map from sentence ID to reference ngrams

 public:
  typedef BleuStats ErrorStats;
  void LoadRefData (vector<string>);
  ErrorStats ComputeErrorStats (Sid, Sentence) const;

};

ostream& operator<< (ostream& o, const Sentence& s);

#endif /* REFSDATA_H_ */