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#ifndef MERT_BLEU_SCORER_H_
#define MERT_BLEU_SCORER_H_
#include <ostream>
#include <string>
#include <vector>
#include "Types.h"
#include "ScoreData.h"
#include "Scorer.h"
#include "ScopedVector.h"
using namespace std;
const int kBleuNgramOrder = 4;
class NgramCounts;
class Reference;
/**
* Bleu scoring
*/
class BleuScorer: public StatisticsBasedScorer
{
public:
enum ReferenceLengthType {
AVERAGE,
CLOSEST,
SHORTEST
};
explicit BleuScorer(const string& config = "");
~BleuScorer();
virtual void setReferenceFiles(const vector<string>& referenceFiles);
virtual void prepareStats(size_t sid, const string& text, ScoreStats& entry);
virtual float calculateScore(const vector<int>& comps) const;
virtual size_t NumberOfScores() const { return 2 * kBleuNgramOrder + 1; }
int CalcReferenceLength(size_t sentence_id, size_t length);
ReferenceLengthType GetReferenceLengthType() const { return m_ref_length_type; }
void SetReferenceLengthType(ReferenceLengthType type) { m_ref_length_type = type; }
const std::vector<Reference*>& GetReferences() const { return m_references.get(); }
/**
* Count the ngrams of each type, up to the given length in the input line.
*/
size_t CountNgrams(const string& line, NgramCounts& counts, unsigned int n);
void DumpCounts(std::ostream* os, const NgramCounts& counts) const;
private:
ReferenceLengthType m_ref_length_type;
// reference translations.
ScopedVector<Reference> m_references;
// no copying allowed
BleuScorer(const BleuScorer&);
BleuScorer& operator=(const BleuScorer&);
};
#endif // MERT_BLEU_SCORER_H_
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