Score.h

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//Copyright (c) 2012, University of Cambridge
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#ifndef SCORE_H_
#define SCORE_H_

#include <BleuStats.h>
#include "TuneSet.h"
#include "function-weight.h"

Sentence GetBestHypothesis (const TupleArcFst*, const PARAMS&);

template<typename RefData>
typename RefData::ErrorStats::Error ComputeError (RefData& refData,
    const TuneSet& lats, const PARAMS& lambda) {
  typename RefData::ErrorStats aggregate;
  for (std::vector<Sid>::const_iterator sit = lats.ids.begin();
       sit != lats.ids.end(); ++sit) {
    if (opts.verbose) {
      tracer << "sentence s=" << *sit << '\n';
    }
    TupleArcFst* fst = lats.GetVectorLattice (*sit, opts.useCache);
    if (!fst) {
      cerr << "ERROR: invalid vector lattice for sentence s=" << *sit
           << '\n';
      exit (1);
    }
    Sentence h = GetBestHypothesis (fst, lambda);
    typename RefData::ErrorStats es = refData.ComputeErrorStats (*sit, h);
    if (opts.verbose) {
      tracer << "best hypothesis=" << h << " " << es << '\n';
    }
    aggregate = aggregate + es;
    if (!opts.useCache) {
      delete fst;
    }
  }
  return aggregate.ComputeError();
}

template<typename RefData>
std::string Score (RefData& refData, const TuneSet& lats,
                   const PARAMS& lambda) {
  typename RefData::ErrorStats::Error error = ComputeError<RefData> (refData,
      lats, lambda);
  std::stringstream ss;
  ss << error;
  return ss.str();
}

class Scorer {
 public:
  virtual std::string operator() (const std::vector<std::string>& refFilenames,
                                  const TuneSet& lats,
                                  const PARAMS& lambda) = 0;
  virtual ~Scorer() {
  }
  ;
};

template<typename RefData>
class ScorerImpl: public Scorer {

  virtual std::string operator() (const std::vector<std::string>& refFilenames,
                                  const TuneSet& lats,
                                  const PARAMS& lambda) {
    RefData refData;
    refData.LoadRefData (refFilenames);
    return Score (refData, lats, lambda);
  }
};

#endif /* SCORE_H_ */