mosesdecoder/moses2/TranslationModel/UnknownWordPenalty.cpp

/*
 * UnknownWordPenalty.cpp
 *
 *  Created on: 28 Oct 2015
 *      Author: hieu
 */
#include <boost/foreach.hpp>
#include "UnknownWordPenalty.h"
#include "../System.h"
#include "../Scores.h"
#include "../InputType.h"
#include "../PhraseBased/Manager.h"
#include "../PhraseBased/TargetPhraseImpl.h"
#include "../PhraseBased/InputPath.h"
#include "../PhraseBased/TargetPhrases.h"
#include "../PhraseBased/Sentence.h"
#include "../SCFG/InputPath.h"
#include "../SCFG/TargetPhraseImpl.h"
#include "../SCFG/Manager.h"
#include "../SCFG/Sentence.h"
#include "../SCFG/ActiveChart.h"

using namespace std;

namespace Moses2
{

UnknownWordPenalty::UnknownWordPenalty(size_t startInd, const std::string &line)
  :PhraseTable(startInd, line)
  ,m_drop(false)
{
  m_tuneable = false;
  ReadParameters();
}

UnknownWordPenalty::~UnknownWordPenalty()
{
  // TODO Auto-generated destructor stub
}

void UnknownWordPenalty::SetParameter(const std::string& key, const std::string& value)
{
  if (key == "drop") {
    m_drop = Scan<bool>(value);
  } else if (key == "prefix") {
    m_prefix = value;
  } else if (key == "suffix") {
    m_suffix = value;
  } else {
    PhraseTable::SetParameter(key, value);
  }
}

void UnknownWordPenalty::ProcessXML(
  const Manager &mgr,
  MemPool &pool,
  const Sentence &sentence,
  InputPaths &inputPaths) const
{
  const Vector<const InputType::XMLOption*> &xmlOptions = sentence.GetXMLOptions();
  BOOST_FOREACH(const InputType::XMLOption *xmlOption, xmlOptions) {
    TargetPhraseImpl *target = TargetPhraseImpl::CreateFromString(pool, *this, mgr.system, xmlOption->GetTranslation());

    if (xmlOption->prob) {
      Scores &scores = target->GetScores();
      scores.PlusEquals(mgr.system, *this, Moses2::TransformScore(xmlOption->prob));
    }

    InputPath *path = inputPaths.GetMatrix().GetValue(xmlOption->startPos, xmlOption->phraseSize - 1);
    const SubPhrase<Moses2::Word> &source = path->subPhrase;

    mgr.system.featureFunctions.EvaluateInIsolation(pool, mgr.system, source, *target);

    TargetPhrases *tps = new (pool.Allocate<TargetPhrases>()) TargetPhrases(pool, 1);

    tps->AddTargetPhrase(*target);
    mgr.system.featureFunctions.EvaluateAfterTablePruning(pool, *tps, source);

    path->AddTargetPhrases(*this, tps);
  }
}

void UnknownWordPenalty::Lookup(const Manager &mgr,
                                InputPathsBase &inputPaths) const
{
  BOOST_FOREACH(InputPathBase *pathBase, inputPaths) {
    InputPath *path = static_cast<InputPath*>(pathBase);

    if (SatisfyBackoff(mgr, *path)) {
      const SubPhrase<Moses2::Word> &phrase = path->subPhrase;

      TargetPhrases *tps = Lookup(mgr, mgr.GetPool(), *path);
      path->AddTargetPhrases(*this, tps);
    }
  }

}

TargetPhrases *UnknownWordPenalty::Lookup(const Manager &mgr, MemPool &pool,
    InputPath &inputPath) const
{
  const System &system = mgr.system;
  TargetPhrases *tps = NULL;

  // any other pt translate this?
  size_t numPt = mgr.system.mappings.size();
  const TargetPhrases **allTPS =
    static_cast<InputPath&>(inputPath).targetPhrases;
  for (size_t i = 0; i < numPt; ++i) {
    const TargetPhrases *otherTps = allTPS[i];

    if (otherTps && otherTps->GetSize()) {
      return tps;
    }
  }

  const SubPhrase<Moses2::Word> &source = inputPath.subPhrase;
  const Moses2::Word &sourceWord = source[0];
  const Factor *factor = sourceWord[0];

  tps = new (pool.Allocate<TargetPhrases>()) TargetPhrases(pool, 1);

  size_t numWords = m_drop ? 0 : 1;

  TargetPhraseImpl *target =
    new (pool.Allocate<TargetPhraseImpl>()) TargetPhraseImpl(pool, *this,
        system, numWords);

  if (!m_drop) {
    Moses2::Word &word = (*target)[0];

    if (m_prefix.empty() && m_suffix.empty()) {
      word[0] = factor;
    } else {
      stringstream strm;
      if (!m_prefix.empty()) {
        strm << m_prefix;
      }
      strm << factor->GetString();
      if (!m_suffix.empty()) {
        strm << m_suffix;
      }

      FactorCollection &fc = system.GetVocab();
      const Factor *targetFactor = fc.AddFactor(strm.str(), system, false);
      word[0] = targetFactor;
    }
  }

  Scores &scores = target->GetScores();
  scores.PlusEquals(mgr.system, *this, -100);

  MemPool &memPool = mgr.GetPool();
  system.featureFunctions.EvaluateInIsolation(memPool, system, source, *target);

  tps->AddTargetPhrase(*target);
  system.featureFunctions.EvaluateAfterTablePruning(memPool, *tps, source);

  return tps;
}

void UnknownWordPenalty::EvaluateInIsolation(const System &system,
    const Phrase<Moses2::Word> &source, const TargetPhraseImpl &targetPhrase, Scores &scores,
    SCORE &estimatedScore) const
{

}

// SCFG ///////////////////////////////////////////////////////////////////////////////////////////
void UnknownWordPenalty::InitActiveChart(
  MemPool &pool,
  const SCFG::Manager &mgr,
  SCFG::InputPath &path) const
{
}

void UnknownWordPenalty::Lookup(MemPool &pool,
                                const SCFG::Manager &mgr,
                                size_t maxChartSpan,
                                const SCFG::Stacks &stacks,
                                SCFG::InputPath &path) const
{
  const System &system = mgr.system;

  size_t numWords = path.range.GetNumWordsCovered();
  if (numWords > 1) {
    // only create 1 word phrases
    return;
  }

  if (path.GetNumRules()) {
    // only create rules if no other rules
    return;
  }

  // don't do 1st if 1st word
  if (path.range.GetStartPos() == 0) {
    return;
  }

  // don't do 1st if last word
  const SCFG::Sentence &sentence = static_cast<const SCFG::Sentence&>(mgr.GetInput());
  if (path.range.GetStartPos() + 1 == sentence.GetSize()) {
    return;
  }

  // terminal
  const SCFG::Word &lastWord = path.subPhrase.Back();
  //cerr << "UnknownWordPenalty lastWord=" << lastWord << endl;

  const Factor *factor = lastWord[0];
  SCFG::TargetPhraseImpl *tp = new (pool.Allocate<SCFG::TargetPhraseImpl>()) SCFG::TargetPhraseImpl(pool, *this, system, 1);
  SCFG::Word &word = (*tp)[0];
  word.CreateFromString(system.GetVocab(), system, factor->GetString().as_string());

  tp->lhs.CreateFromString(system.GetVocab(), system, "[X]");

  size_t endPos = path.range.GetEndPos();
  const SCFG::InputPath &subPhrasePath = *mgr.GetInputPaths().GetMatrix().GetValue(endPos, 1);

  SCFG::ActiveChartEntry *chartEntry = new (pool.Allocate<SCFG::ActiveChartEntry>()) SCFG::ActiveChartEntry(pool);
  chartEntry->AddSymbolBindElement(subPhrasePath.range, lastWord, NULL, *this);
  path.AddActiveChartEntry(GetPtInd(), chartEntry);

  Scores &scores = tp->GetScores();
  scores.PlusEquals(mgr.system, *this, -100);

  MemPool &memPool = mgr.GetPool();
  const SubPhrase<SCFG::Word> &source = path.subPhrase;
  system.featureFunctions.EvaluateInIsolation(memPool, system, source, *tp);

  SCFG::TargetPhrases *tps = new (pool.Allocate<SCFG::TargetPhrases>()) SCFG::TargetPhrases(pool);
  tps->AddTargetPhrase(*tp);

  path.AddTargetPhrasesToPath(pool, mgr.system, *this, *tps, chartEntry->GetSymbolBind());
}

void UnknownWordPenalty::LookupUnary(MemPool &pool,
                                     const SCFG::Manager &mgr,
                                     const SCFG::Stacks &stacks,
                                     SCFG::InputPath &path) const
{
}

void UnknownWordPenalty::LookupNT(
  MemPool &pool,
  const SCFG::Manager &mgr,
  const Moses2::Range &subPhraseRange,
  const SCFG::InputPath &prevPath,
  const SCFG::Stacks &stacks,
  SCFG::InputPath &outPath) const
{
  UTIL_THROW2("Not implemented");
}

void UnknownWordPenalty::LookupGivenWord(
  MemPool &pool,
  const SCFG::Manager &mgr,
  const SCFG::InputPath &prevPath,
  const SCFG::Word &wordSought,
  const Moses2::Hypotheses *hypos,
  const Moses2::Range &subPhraseRange,
  SCFG::InputPath &outPath) const
{
  UTIL_THROW2("Not implemented");
}

void UnknownWordPenalty::LookupGivenNode(
  MemPool &pool,
  const SCFG::Manager &mgr,
  const SCFG::ActiveChartEntry &prevEntry,
  const SCFG::Word &wordSought,
  const Moses2::Hypotheses *hypos,
  const Moses2::Range &subPhraseRange,
  SCFG::InputPath &outPath) const
{
  UTIL_THROW2("Not implemented");
}

}