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46 lines
1.1 KiB
C++
46 lines
1.1 KiB
C++
#ifndef MERT_PER_SCORER_H_
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#define MERT_PER_SCORER_H_
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#include <set>
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#include <string>
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#include <vector>
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#include "Types.h"
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#include "StatisticsBasedScorer.h"
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namespace MosesTuning
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{
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class ScoreStats;
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/**
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* An implementation of position-independent word error rate.
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* This is defined as
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* 1 - (correct - max(0,output_length - ref_length)) / ref_length
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* In fact, we ignore the " 1 - " so that it can be maximised.
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*/
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class PerScorer: public StatisticsBasedScorer
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{
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public:
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explicit PerScorer(const std::string& config = "");
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~PerScorer();
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virtual void setReferenceFiles(const std::vector<std::string>& referenceFiles);
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virtual void prepareStats(std::size_t sid, const std::string& text, ScoreStats& entry);
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virtual std::size_t NumberOfScores() const { return 3; }
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virtual float calculateScore(const std::vector<int>& comps) const;
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private:
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// no copying allowed
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PerScorer(const PerScorer&);
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PerScorer& operator=(const PerScorer&);
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// data extracted from reference files
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std::vector<std::size_t> m_ref_lengths;
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std::vector<std::multiset<int> > m_ref_tokens;
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};
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}
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#endif // MERT_PER_SCORER_H_
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