mosesdecoder/moses/TranslationSystem.cpp

// $Id: $

/***********************************************************************
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
***********************************************************************/

#include <stdexcept>
#include <iostream>

#include "DecodeGraph.h"
#include "DecodeStep.h"
#include "DummyScoreProducers.h"
#include "GlobalLexicalModel.h"
#include "GlobalLexicalModelUnlimited.h"
#include "WordTranslationFeature.h"
#include "PhrasePairFeature.h"
#include "LexicalReordering.h"
#include "StaticData.h"
#include "TranslationSystem.h"
#include "Util.h"

using namespace std;

namespace Moses {
  
  const string TranslationSystem::DEFAULT = "default";

    TranslationSystem::TranslationSystem(const std::string& id, 
                      const WordPenaltyProducer* wpProducer,
                      const UnknownWordPenaltyProducer* uwpProducer,
                      const DistortionScoreProducer* distortionProducer)
    : m_id(id), m_wpProducer(wpProducer), m_unknownWpProducer(uwpProducer), m_distortionScoreProducer(distortionProducer)
    {
      StaticData::InstanceNonConst().AddFeatureFunction(wpProducer);
      StaticData::InstanceNonConst().AddFeatureFunction(uwpProducer);
      if (distortionProducer) {
        StaticData::InstanceNonConst().AddFeatureFunction(distortionProducer);
      }
    }
    
    //Insert core 'big' features
    void TranslationSystem::AddLanguageModel(LanguageModel* languageModel) {
      m_languageModels.Add(languageModel);
      StaticData::InstanceNonConst().AddFeatureFunction(languageModel);
    }

    void TranslationSystem::AddDecodeGraph(DecodeGraph* decodeGraph, size_t backoff) {
      m_decodeGraphs.push_back(decodeGraph);
      m_decodeGraphBackoff.push_back(backoff);
    }

    void TranslationSystem::AddReorderModel(LexicalReordering* reorderModel) {
      m_reorderingTables.push_back(reorderModel);
      StaticData::InstanceNonConst().AddFeatureFunction(reorderModel);
    }

    void TranslationSystem::AddGlobalLexicalModel(GlobalLexicalModel* globalLexicalModel) {
      m_globalLexicalModels.push_back(globalLexicalModel);
      StaticData::InstanceNonConst().AddFeatureFunction(globalLexicalModel);
    }
    
    void TranslationSystem::ConfigDictionaries() {
      for (vector<DecodeGraph*>::const_iterator i = m_decodeGraphs.begin();
        i != m_decodeGraphs.end(); ++i) {
          for (DecodeGraph::const_iterator j = (*i)->begin(); j != (*i)->end(); ++j) {
            const DecodeStep* step = *j;
            PhraseDictionaryFeature* pdict = const_cast<PhraseDictionaryFeature*>(step->GetPhraseDictionaryFeature());
            if (pdict) {
              m_phraseDictionaries.push_back(pdict);
              StaticData::InstanceNonConst().AddFeatureFunction(pdict);
              const_cast<PhraseDictionaryFeature*>(pdict)->InitDictionary(this);
            }
            GenerationDictionary* gdict = const_cast<GenerationDictionary*>(step->GetGenerationDictionaryFeature());
            if (gdict) {
              m_generationDictionaries.push_back(gdict);
              StaticData::InstanceNonConst().AddFeatureFunction(gdict);
            }
          }
      }
    }
    
    void TranslationSystem::InitializeBeforeSentenceProcessing(const InputType& source) const {
      for (vector<PhraseDictionaryFeature*>::const_iterator i = m_phraseDictionaries.begin();
           i != m_phraseDictionaries.end(); ++i) {
             (*i)->InitDictionary(this,source);
           }
           
      for(size_t i=0;i<m_reorderingTables.size();++i) {
        m_reorderingTables[i]->InitializeForInput(source);
      }
      for(size_t i=0;i<m_globalLexicalModels.size();++i) {
        m_globalLexicalModels[i]->InitializeForInput((Sentence const&)source);
      }

      /* TODO - get rid of GetScoreProducerWeightShortName()
      for(size_t i=0;i<m_statelessFFs.size();++i) {
        if (m_statelessFFs[i]->GetScoreProducerWeightShortName() == "glm") 
        {
	        ((GlobalLexicalModelUnlimited*)m_statelessFFs[i])->InitializeForInput((Sentence const&)source);
        }
      }
      */

      LMList::const_iterator iterLM;
      for (iterLM = m_languageModels.begin() ; iterLM != m_languageModels.end() ; ++iterLM)
      {
        LanguageModel &languageModel = **iterLM;
        languageModel.InitializeBeforeSentenceProcessing();
      }
    }
    
     void TranslationSystem::CleanUpAfterSentenceProcessing(const InputType& source) const {
        
        for(size_t i=0;i<m_phraseDictionaries.size();++i)
        {
          PhraseDictionaryFeature &phraseDictionaryFeature = *m_phraseDictionaries[i];
          PhraseDictionary* phraseDictionary = const_cast<PhraseDictionary*>(phraseDictionaryFeature.GetDictionary());
          phraseDictionary->CleanUp(source);

        }
  
        for(size_t i=0;i<m_generationDictionaries.size();++i)
            m_generationDictionaries[i]->CleanUp(source);
  
        //something LMs could do after each sentence 
        LMList::const_iterator iterLM;
        for (iterLM = m_languageModels.begin() ; iterLM != m_languageModels.end() ; ++iterLM)
        {
          LanguageModel &languageModel = **iterLM;
          languageModel.CleanUpAfterSentenceProcessing(source);
        }
     }
    
    float TranslationSystem::GetWeightWordPenalty() const {
      float weightWP = StaticData::Instance().GetWeight(m_wpProducer);
      //VERBOSE(1, "Read weightWP from translation sytem: " << weightWP << std::endl);
      return weightWP;
    }
    
    float TranslationSystem::GetWeightUnknownWordPenalty() const {
      return StaticData::Instance().GetWeight(m_unknownWpProducer);
    }
    
    float TranslationSystem::GetWeightDistortion() const {
      CHECK(m_distortionScoreProducer);
      return StaticData::Instance().GetWeight(m_distortionScoreProducer);
    }

    std::vector<float> TranslationSystem::GetTranslationWeights(size_t index) const {
      std::vector<float> weights = StaticData::Instance().GetWeights(GetTranslationScoreProducer(index));
      return weights;
    }
};