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#ifndef MERT_PER_SCORER_H_
#define MERT_PER_SCORER_H_
#include <set>
#include <string>
#include <vector>
#include "Types.h"
#include "StatisticsBasedScorer.h"
class ScoreStats;
/**
* An 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:
explicit PerScorer(const std::string& config = "");
~PerScorer();
virtual void setReferenceFiles(const std::vector<std::string>& referenceFiles);
virtual void prepareStats(std::size_t sid, const std::string& text, ScoreStats& entry);
virtual std::size_t NumberOfScores() const { return 3; }
virtual float calculateScore(const std::vector<int>& comps) const;
private:
// no copying allowed
PerScorer(const PerScorer&);
PerScorer& operator=(const PerScorer&);
// data extracted from reference files
std::vector<std::size_t> m_ref_lengths;
std::vector<std::multiset<int> > m_ref_tokens;
};
#endif // MERT_PER_SCORER_H_
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