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#ifndef SCORER_H_
#define SCORER_H_
#include <vector>
#include <string>
#include "wordid.h"
class ViterbiEnvelope;
class ErrorSurface;
class Hypergraph; // needed for alignment
enum ScoreType { IBM_BLEU, NIST_BLEU, Koehn_BLEU, TER, BLEU_minus_TER_over_2, SER, AER };
ScoreType ScoreTypeFromString(const std::string& st);
class Score {
public:
virtual ~Score();
virtual float ComputeScore() const = 0;
virtual void ScoreDetails(std::string* details) const = 0;
virtual void PlusEquals(const Score& rhs) = 0;
virtual void Subtract(const Score& rhs, Score* res) const = 0;
virtual Score* GetZero() const = 0;
virtual bool IsAdditiveIdentity() const = 0; // returns true if adding this delta
// to another score results in no score change
// under any circumstances
virtual void Encode(std::string* out) const = 0;
};
class SentenceScorer {
public:
virtual ~SentenceScorer();
void ComputeErrorSurface(const ViterbiEnvelope& ve, ErrorSurface* es, const ScoreType type, const Hypergraph& hg) const;
virtual Score* ScoreCandidate(const std::vector<WordID>& hyp) const = 0;
virtual const std::string* GetSource() const;
static Score* CreateScoreFromString(const ScoreType type, const std::string& in);
static SentenceScorer* CreateSentenceScorer(const ScoreType type,
const std::vector<std::vector<WordID> >& refs,
const std::string& src = "");
};
class DocScorer {
public:
~DocScorer();
DocScorer(
const ScoreType type,
const std::vector<std::string>& ref_files,
const std::string& src_file = "");
int size() const { return scorers_.size(); }
const SentenceScorer* operator[](size_t i) const { return scorers_[i]; }
private:
std::vector<SentenceScorer*> scorers_;
};
#endif
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