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103 lines
2.6 KiB
C++
103 lines
2.6 KiB
C++
/*
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* CHRFScorer.h
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*
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* Created on: Dec 28, 2016
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* Author: pramathur@ebay.com
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*/
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#pragma once
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#ifndef MERT_CHRFSCORER_H_
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#define MERT_CHRFSCORER_H_
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#include <fstream>
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#include <string>
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#include <vector>
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#include <set>
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#include <boost/shared_ptr.hpp>
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#include "Ngram.h"
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#include "Reference.h"
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#include "ScopedVector.h"
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#include "ScoreData.h"
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#include "StatisticsBasedScorer.h"
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#include "Types.h"
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namespace MosesTuning {
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const size_t CHRFNgramOrder = 6;
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class CHRFScorer : public StatisticsBasedScorer{
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public:
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enum ReferenceLengthType {
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AVERAGE,
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CLOSEST,
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SHORTEST
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};
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explicit CHRFScorer(const std::string& config = "");
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~CHRFScorer();
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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 statscore_t calculateScore(const std::vector<ScoreStatsType>& comps) const;
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virtual std::size_t NumberOfScores() const {
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return 3*CHRFNgramOrder + 2;
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}
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void CalcCHRFStats(const Reference& ref, const std::string& text, ScoreStats& entry) const;
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int CalcReferenceLength(const Reference& ref, std::size_t length) const;
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ReferenceLengthType GetReferenceLengthType() const {
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return m_ref_length_type;
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}
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void SetReferenceLengthType(ReferenceLengthType type) {
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m_ref_length_type = type;
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}
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const std::vector<Reference*>& GetReferences() const {
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return m_references.get();
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}
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virtual float getReferenceLength(const std::vector<ScoreStatsType>& totals) const {
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return totals[CHRFNgramOrder*3+2];
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}
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/**
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* Count the ngrams of each type, up to the given length in the input line.
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*/
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size_t CountNgrams(const std::string& line, NgramCounts& counts, unsigned int n, bool is_testing=false) const;
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void DumpCounts(std::ostream* os, const NgramCounts& counts) const;
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// NOTE: this function is also used for unit testing.
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bool OpenReferenceStream(std::istream* is, std::size_t file_id);
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void ProcessReferenceLine(const std::string& line, Reference* ref) const;
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bool GetNextReferenceFromStreams(std::vector<boost::shared_ptr<std::ifstream> >& referenceStreams, Reference& ref) const;
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protected:
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ReferenceLengthType m_ref_length_type;
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// reference translations.
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ScopedVector<Reference> m_references;
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// no copying allowed
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CHRFScorer(const CHRFScorer&);
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CHRFScorer& operator=(const CHRFScorer&);
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private:
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float m_beta;
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float m_smooth;
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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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} /* namespace MosesTuning */
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#endif /* MERT_CHRFSCORER_H_ */
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