mosesdecoder/moses2/TranslationModel/PhraseTable.cpp

/*
 * PhraseTable.cpp
 *
 *  Created on: 23 Oct 2015
 *      Author: hieu
 */
#include <boost/foreach.hpp>
#include <queue>
#include "PhraseTable.h"
#include "../legacy/Util2.h"
#include "../TypeDef.h"
#include "../InputType.h"
#include "../PhraseBased/Manager.h"
#include "../PhraseBased/InputPath.h"
#include "../SCFG/InputPath.h"
#include "../SCFG/Manager.h"

using namespace std;

namespace Moses2
{

////////////////////////////////////////////////////////////////////////////
PhraseTable::PhraseTable(size_t startInd, const std::string &line) :
  StatelessFeatureFunction(startInd, line), m_tableLimit(20) // default
  , m_maxCacheSize(DEFAULT_MAX_TRANS_OPT_CACHE_SIZE)
{
  m_input.push_back(0);
}

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

void PhraseTable::SetParameter(const std::string& key, const std::string& value)
{
  if (key == "cache-size") {
    m_maxCacheSize = Scan<size_t>(value);
  } else if (key == "path") {
    m_path = value;
  } else if (key == "input-factor") {
    m_input = Tokenize<FactorType>(value, ",");
  } else if (key == "output-factor") {
    m_output = Tokenize<FactorType>(value, ",");
  } else if (key == "table-limit") {
    m_tableLimit = Scan<size_t>(value);
  } else {
    StatelessFeatureFunction::SetParameter(key, value);
  }
}

bool PhraseTable::SatisfyBackoff(const Manager &mgr, const InputPath &path) const
{
  const InputType &input = mgr.GetInput();
  if ((mgr.system.options.input.xml_policy == XmlExclusive)
      && input.XmlOverlap(path.range.GetStartPos(), path.range.GetEndPos())) {
    return false;
  }

  //cerr << GetName() << "=" << GetPtInd() << "=" << decodeGraphBackoff << endl;
  if (decodeGraphBackoff == 0) {
    // always lookup
    return true;
  } else if (decodeGraphBackoff == -1) {
    // lookup only if there's no existing rules
    return path.GetNumRules() ? false : true;
  } else if (path.range.GetNumWordsCovered() <= decodeGraphBackoff) {
    return path.GetNumRules() ? false : true;
  }

  return false;
}

void PhraseTable::Lookup(const Manager &mgr, InputPathsBase &inputPaths) const
{
  BOOST_FOREACH(InputPathBase *pathBase, inputPaths) {
    InputPath *path = static_cast<InputPath*>(pathBase);
    //cerr << "path=" << path->range << " ";

    if (SatisfyBackoff(mgr, *path)) {
      TargetPhrases *tpsPtr = Lookup(mgr, mgr.GetPool(), *path);
      //cerr << "tpsPtr=" << tpsPtr << endl;

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

}

TargetPhrases *PhraseTable::Lookup(const Manager &mgr, MemPool &pool,
                                   InputPath &inputPath) const
{
  UTIL_THROW2("Not implemented");
}

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

void PhraseTable::EvaluateInIsolation(MemPool &pool, const System &system, const Phrase<SCFG::Word> &source,
                                      const TargetPhrase<SCFG::Word> &targetPhrase, Scores &scores,
                                      SCORE &estimatedScore) const
{

}

// scfg
void PhraseTable::LookupUnary(MemPool &pool,
                              const SCFG::Manager &mgr,
                              const SCFG::Stacks &stacks,
                              SCFG::InputPath &path) const
{
  //cerr << "BEFORE LookupUnary" << path.Debug(mgr.system) << endl;
  size_t startPos = path.range.GetStartPos();
  const SCFG::InputPath *prevPath = mgr.GetInputPaths().GetMatrix().GetValue(startPos, 0);
  LookupNT(pool, mgr, path.range, *prevPath, stacks, path);
  //cerr << "AFTER LookupUnary" << path.Debug(mgr.system) << endl;
}

void PhraseTable::LookupNT(
  MemPool &pool,
  const SCFG::Manager &mgr,
  const Moses2::Range &subPhraseRange,
  const SCFG::InputPath &prevPath,
  const SCFG::Stacks &stacks,
  SCFG::InputPath &outPath) const
{
  size_t endPos = outPath.range.GetEndPos();

  const Range &prevRange = prevPath.range;

  size_t startPos = prevRange.GetEndPos() + 1;
  size_t ntSize = endPos - startPos + 1;

  const SCFG::Stack &ntStack = stacks.GetStack(startPos, ntSize);
  const SCFG::Stack::Coll &stackColl = ntStack.GetColl();

  BOOST_FOREACH (const SCFG::Stack::Coll::value_type &valPair, stackColl) {
    const SCFG::Word &ntSought = valPair.first;
    const Moses2::HypothesisColl *hypos = valPair.second;
    const Moses2::Hypotheses &sortedHypos = hypos->GetSortedAndPrunedHypos(mgr, mgr.arcLists);
    //cerr << "ntSought=" << ntSought << ntSought.isNonTerminal << endl;
    LookupGivenWord(pool, mgr, prevPath, ntSought, &sortedHypos, subPhraseRange, outPath);
  }
}

void PhraseTable::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
{
  size_t ptInd = GetPtInd();


  BOOST_FOREACH(const SCFG::ActiveChartEntry *prevEntry, prevPath.GetActiveChart(ptInd).entries) {
    //cerr << "BEFORE LookupGivenNode=" << prevPath << endl;
    LookupGivenNode(pool, mgr, *prevEntry, wordSought, hypos, subPhraseRange, outPath);
    //cerr << "AFTER LookupGivenNode=" << prevPath << endl;
  }
}

}