mosesdecoder/moses/src/TargetPhrase.cpp

// $Id$

/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (C) 2006 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 <cassert>
#include <algorithm>
#include "TargetPhrase.h"
#include "PhraseDictionaryMemory.h"
#include "GenerationDictionary.h"
#include "LanguageModel.h"
#include "StaticData.h"
#include "ScoreIndexManager.h"
#include "LMList.h"
#include "ScoreComponentCollection.h"
#include "Util.h"
#include "DummyScoreProducers.h"
#include "AlignmentInfoCollection.h"

using namespace std;

namespace Moses
{
bool TargetPhrase::wordalignflag=StaticData::Instance().UseAlignmentInfo();
bool TargetPhrase::printalign=StaticData::Instance().PrintAlignmentInfo();

//bool TargetPhrase::wordalignflag;
//bool TargetPhrase::printalign;

TargetPhrase::TargetPhrase(FactorDirection direction, std::string out_string)
  :Phrase(direction, 0),m_transScore(0.0), m_fullScore(0.0), m_sourcePhrase(0)
  , m_alignmentInfo(&AlignmentInfoCollection::Instance().GetEmptyAlignmentInfo())
{

  //ACAT
  const StaticData &staticData = StaticData::Instance();
  CreateFromString(staticData.GetInputFactorOrder(), out_string, staticData.GetFactorDelimiter());
  wordalignflag=StaticData::Instance().UseAlignmentInfo();
  printalign=StaticData::Instance().PrintAlignmentInfo();
}


TargetPhrase::TargetPhrase(FactorDirection direction)
  :Phrase(direction, ARRAY_SIZE_INCR)
  , m_transScore(0.0)
  , m_fullScore(0.0)
  , m_sourcePhrase(0)
  , m_alignmentInfo(&AlignmentInfoCollection::Instance().GetEmptyAlignmentInfo())
{
  wordalignflag=StaticData::Instance().UseAlignmentInfo();
  printalign=StaticData::Instance().PrintAlignmentInfo();
}

TargetPhrase::~TargetPhrase()
{
}

void TargetPhrase::SetScore(const TranslationSystem* system)
{
  // used when creating translations of unknown words:
  m_transScore = 0;
  m_fullScore = - system->GetWeightWordPenalty();
}

#ifdef HAVE_PROTOBUF
void TargetPhrase::WriteToRulePB(hgmert::Rule* pb) const
{
  pb->add_trg_words("[X,1]");
  for (size_t pos = 0 ; pos < GetSize() ; pos++)
    pb->add_trg_words(GetWord(pos)[0]->GetString());
}
#endif



void TargetPhrase::SetScore(float score)
{
  //we use an existing score producer to figure out information for score setting (number of scores and weights)
  //TODO: is this a good idea?
  // Assume the default system.
  const TranslationSystem& system =  StaticData::Instance().GetTranslationSystem(TranslationSystem::DEFAULT);
  const ScoreProducer* prod = system.GetPhraseDictionaries()[0];

  //get the weight list
  unsigned int id = prod->GetScoreBookkeepingID();

  const vector<float> &allWeights = StaticData::Instance().GetAllWeights();

  size_t beginIndex = StaticData::Instance().GetScoreIndexManager().GetBeginIndex(id);
  size_t endIndex = StaticData::Instance().GetScoreIndexManager().GetEndIndex(id);

  vector<float> weights;

  std::copy(allWeights.begin() +beginIndex, allWeights.begin() + endIndex,std::back_inserter(weights));

  //find out how many items are in the score vector for this producer
  size_t numScores = prod->GetNumScoreComponents();

  //divide up the score among all of the score vectors
  vector <float> scoreVector(numScores,score/numScores);

  //Now we have what we need to call the full SetScore method
  SetScore(prod,scoreVector,weights,system.GetWeightWordPenalty(),system.GetLanguageModels());
}

/**
 * used for setting scores for unknown words with input link features (lattice/conf. nets)
 * \param scoreVector input scores
 */
void TargetPhrase::SetScore(const TranslationSystem* system, const Scores &scoreVector)
{
  //we use an existing score producer to figure out information for score setting (number of scores and weights)

  const ScoreProducer* prod = system->GetPhraseDictionaries()[0];

  //get the weight list
  unsigned int id = prod->GetScoreBookkeepingID();
  const vector<float> &allWeights = StaticData::Instance().GetAllWeights();
  size_t beginIndex = StaticData::Instance().GetScoreIndexManager().GetBeginIndex(id);
  size_t endIndex = StaticData::Instance().GetScoreIndexManager().GetEndIndex(id);
  vector<float> weights;
  std::copy(allWeights.begin() +beginIndex, allWeights.begin() + endIndex,std::back_inserter(weights));

  //expand the input weight vector
  assert(scoreVector.size() <= prod->GetNumScoreComponents());
  Scores sizedScoreVector = scoreVector;
  sizedScoreVector.resize(prod->GetNumScoreComponents(),0.0f);

  SetScore(prod,sizedScoreVector,weights,system->GetWeightWordPenalty(),system->GetLanguageModels());
}

void TargetPhrase::SetScore(const ScoreProducer* translationScoreProducer,
                            const Scores &scoreVector,
                            const vector<float> &weightT,
                            float weightWP, const LMList &languageModels)
{
  assert(weightT.size() == scoreVector.size());
  // calc average score if non-best

  m_transScore = std::inner_product(scoreVector.begin(), scoreVector.end(), weightT.begin(), 0.0f);
  m_scoreBreakdown.PlusEquals(translationScoreProducer, scoreVector);

  // Replicated from TranslationOptions.cpp
  float totalFutureScore = 0;
  float totalNgramScore  = 0;
  float totalFullScore   = 0;

  LMList::const_iterator lmIter;
  for (lmIter = languageModels.begin(); lmIter != languageModels.end(); ++lmIter) {
    const LanguageModel &lm = **lmIter;

    if (lm.Useable(*this)) {
      // contains factors used by this LM
      const float weightLM = lm.GetWeight();
      float fullScore, nGramScore;

      lm.CalcScore(*this, fullScore, nGramScore);
      m_scoreBreakdown.Assign(&lm, nGramScore);

      // total LM score so far
      totalNgramScore  += nGramScore * weightLM;
      totalFullScore   += fullScore * weightLM;

    }
  }

  m_fullScore = m_transScore + totalFutureScore + totalFullScore
                - (this->GetSize() * weightWP);	 // word penalty
}

void TargetPhrase::SetScoreChart(const ScoreProducer* translationScoreProducer,
                                 const Scores &scoreVector
                                 ,const vector<float> &weightT
                                 ,const LMList &languageModels
                                 ,const WordPenaltyProducer* wpProducer)
{

  assert(weightT.size() == scoreVector.size());

  // calc average score if non-best
  m_transScore = std::inner_product(scoreVector.begin(), scoreVector.end(), weightT.begin(), 0.0f);
  m_scoreBreakdown.PlusEquals(translationScoreProducer, scoreVector);

  // Replicated from TranslationOptions.cpp
  float totalNgramScore  = 0;
  float totalFullScore   = 0;

  LMList::const_iterator lmIter;
  for (lmIter = languageModels.begin(); lmIter != languageModels.end(); ++lmIter) {
    const LanguageModel &lm = **lmIter;

    if (lm.Useable(*this)) {
      // contains factors used by this LM
      const float weightLM = lm.GetWeight();
      float fullScore, nGramScore;

      lm.CalcScore(*this, fullScore, nGramScore);
      fullScore = UntransformLMScore(fullScore);
      nGramScore = UntransformLMScore(nGramScore);

      m_scoreBreakdown.Assign(&lm, nGramScore);

      // total LM score so far
      totalNgramScore  += nGramScore * weightLM;
      totalFullScore   += fullScore * weightLM;
    }
  }

  // word penalty
  size_t wordCount = GetNumTerminals();
  m_scoreBreakdown.Assign(wpProducer, - (float) wordCount * 0.434294482); // TODO log -> ln ??

  m_fullScore = m_scoreBreakdown.GetWeightedScore() - totalNgramScore + totalFullScore;
}

void TargetPhrase::SetScore(const ScoreProducer* producer, const Scores &scoreVector)
{
  // used when creating translations of unknown words (chart decoding)
  m_scoreBreakdown.Assign(producer, scoreVector);
  m_transScore = 0;
  m_fullScore = m_scoreBreakdown.GetWeightedScore();
}


void TargetPhrase::SetWeights(const ScoreProducer* translationScoreProducer, const vector<float> &weightT)
{
  // calling this function in case of confusion net input is undefined
  assert(StaticData::Instance().GetInputType()==SentenceInput);

  /* one way to fix this, you have to make sure the weightT contains (in
     addition to the usual phrase translation scaling factors) the input
     weight factor as last element
  */

  m_transScore = m_scoreBreakdown.PartialInnerProduct(translationScoreProducer, weightT);
}

void TargetPhrase::ResetScore()
{
  m_fullScore = 0;
  m_scoreBreakdown.ZeroAll();
}

TargetPhrase *TargetPhrase::MergeNext(const TargetPhrase &inputPhrase) const
{
  if (! IsCompatible(inputPhrase)) {
    return NULL;
  }

  // ok, merge
  TargetPhrase *clone				= new TargetPhrase(*this);
  clone->m_sourcePhrase = m_sourcePhrase;
  int currWord = 0;
  const size_t len = GetSize();
  for (size_t currPos = 0 ; currPos < len ; currPos++) {
    const Word &inputWord	= inputPhrase.GetWord(currPos);
    Word &cloneWord = clone->GetWord(currPos);
    cloneWord.Merge(inputWord);

    currWord++;
  }

  return clone;
}

void TargetPhrase::SetAlignmentInfo(const std::string &alignString)
{
  set<pair<size_t,size_t> > alignmentInfo;
  vector<string> alignVec;
  Tokenize(alignVec, alignString);

  vector<string>::const_iterator iter;
  for (iter = alignVec.begin(); iter != alignVec.end(); ++iter) {
    const string &align1 = *iter;
    vector<size_t> alignPos = Tokenize<size_t>(align1, "-");
    assert(alignPos.size() == 2);
    size_t &sourcePos	= alignPos[0]
                        ,&targetPos	= alignPos[1];

    alignmentInfo.insert(pair<size_t,size_t>(sourcePos, targetPos));
  }

  SetAlignmentInfo(alignmentInfo);
}

void TargetPhrase::SetAlignmentInfo(const std::set<std::pair<size_t,size_t> > &alignmentInfo)
{
  m_alignmentInfo = AlignmentInfoCollection::Instance().Add(alignmentInfo);
}


TO_STRING_BODY(TargetPhrase);

std::ostream& operator<<(std::ostream& os, const TargetPhrase& tp)
{
  os << static_cast<const Phrase&>(tp) << ":" << tp.GetAlignmentInfo();
  os << ": pC=" << tp.m_transScore << ", c=" << tp.m_fullScore;

  return os;
}

}