mosesdecoder/mira/Decoder.h

/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (C) 2010 University of Edinburgh

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
***********************************************************************/
#ifndef _MIRA_DECODER_H_
#define _MIRA_DECODER_H_

#include <iostream>
#include <cstring>
#include <sstream>


#include "BleuScoreFeature.h"
#include "ChartTrellisPathList.h"
#include "Hypothesis.h"
#include "Parameter.h"
#include "SearchNormal.h"
#include "Sentence.h"
#include "StaticData.h"

//
// Wrapper functions and objects for the decoder.
//

namespace Mira {
  
/**
  * Wraps moses decoder.
 **/
class MosesDecoder {
  public:
	/**
	 * Initialise moses (including StaticData) using the given ini file and debuglevel, passing through any
	 * other command line arguments.
	 **/
    MosesDecoder(const std::string& inifile, int debuglevel,  int argc, std::vector<std::string> decoder_params);
	
    //returns the best sentence
    std::vector<const Moses::Word*> getNBest(const std::string& source,
                          size_t sentenceid,
                          size_t count,
                          float bleuObjectiveweight, //weight of bleu in objective
                          float bleuScoreWeight, //weight of bleu in score
                          std::vector< Moses::ScoreComponentCollection>& featureValues,
                          std::vector< float>& scores,
                          bool oracle,
                          bool distinct,
                          size_t rank,
                          size_t epoch);
    size_t getCurrentInputLength();
    void updateHistory(const std::vector<const Moses::Word*>& words);
    void updateHistory(const std::vector< std::vector< const Moses::Word*> >& words, std::vector<size_t>& sourceLengths, std::vector<size_t>& ref_ids, size_t rank, size_t epoch);
//    void loadReferenceSentences(const std::vector<std::vector<std::string> >& refs);
    void printBleuFeatureHistory(std::ostream& out);
//    void printReferenceLength(const std::vector<size_t>& ref_ids);
    size_t getClosestReferenceLength(size_t ref_id, int hypoLength);
    void setBleuParameters(bool scaleByInputLength, bool scaleByRefLength, bool scaleByAvgLength,
    		bool scaleByTargetLengthLinear, bool scaleByTargetLengthTrend,
  		  float scaleByX, float historySmoothing, size_t scheme, float relax_BP);
    Moses::ScoreComponentCollection getWeights();
    void setWeights(const Moses::ScoreComponentCollection& weights);
    void cleanup();

    void setCorrection(float correction) {
    	m_bleuScoreFeature->SetCorrection(correction);
    }
		
	private:
    float getBleuScore(const Moses::ScoreComponentCollection& scores);
    void setBleuScore(Moses::ScoreComponentCollection& scores, float bleu);
    Moses::Manager *m_manager;
    Moses::Sentence *m_sentence;
    Moses::BleuScoreFeature *m_bleuScoreFeature;
	

};


} //namespace

#endif