mosesdecoder/moses/ChartTranslationOptions.cpp
2013-09-27 09:35:24 +01:00

139 lines
4.6 KiB
C++

/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (C) 2010 Hieu Hoang
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 "ChartTranslationOptions.h"
#include "ChartHypothesis.h"
#include "ChartCellLabel.h"
#include "ChartTranslationOption.h"
#include "InputPath.h"
#include "StaticData.h"
using namespace std;
namespace Moses
{
ChartTranslationOptions::ChartTranslationOptions(const TargetPhraseCollection &targetPhraseColl,
const StackVec &stackVec,
const WordsRange &wordsRange,
float score)
: m_stackVec(stackVec)
, m_wordsRange(&wordsRange)
, m_estimateOfBestScore(score)
{
TargetPhraseCollection::const_iterator iter;
for (iter = targetPhraseColl.begin(); iter != targetPhraseColl.end(); ++iter) {
const TargetPhrase *origTP = *iter;
boost::shared_ptr<ChartTranslationOption> ptr(new ChartTranslationOption(*origTP));
m_collection.push_back(ptr);
}
}
ChartTranslationOptions::~ChartTranslationOptions()
{
}
float ChartTranslationOptions::CalcEstimateOfBestScore(
const TargetPhraseCollection &tpc,
const StackVec &stackVec)
{
const TargetPhrase &targetPhrase = **(tpc.begin());
float estimateOfBestScore = targetPhrase.GetFutureScore();
for (StackVec::const_iterator p = stackVec.begin(); p != stackVec.end();
++p) {
const HypoList *stack = (*p)->GetStack().cube;
assert(stack);
assert(!stack->empty());
const ChartHypothesis &bestHypo = **(stack->begin());
estimateOfBestScore += bestHypo.GetTotalScore();
}
return estimateOfBestScore;
}
void ChartTranslationOptions::Evaluate(const InputType &input, const InputPath &inputPath)
{
SetInputPath(&inputPath);
if (StaticData::Instance().GetPlaceholderFactor() != NOT_FOUND) {
CreateSourceRuleFromInputPath();
}
CollType::iterator iter;
for (iter = m_collection.begin(); iter != m_collection.end(); ++iter) {
ChartTranslationOption &transOpt = **iter;
transOpt.SetInputPath(&inputPath);
transOpt.Evaluate(input, inputPath);
}
}
void ChartTranslationOptions::SetInputPath(const InputPath *inputPath)
{
CollType::iterator iter;
for (iter = m_collection.begin(); iter != m_collection.end(); ++iter) {
ChartTranslationOption &transOpt = **iter;
transOpt.SetInputPath(inputPath);
}
}
void ChartTranslationOptions::CreateSourceRuleFromInputPath()
{
if (m_collection.size() == 0) {
return;
}
const InputPath *inputPath = m_collection.front()->GetInputPath();
CHECK(inputPath);
std::vector<const Word*> &ruleSourceFromInputPath = inputPath->AddRuleSourceFromInputPath();
size_t chartCellIndex = 0;
const ChartCellLabel *chartCellLabel = (chartCellIndex < m_stackVec.size()) ? m_stackVec[chartCellIndex] : NULL;
size_t ind = 0;
for (size_t sourcePos = m_wordsRange->GetStartPos(); sourcePos <= m_wordsRange->GetEndPos(); ++sourcePos, ++ind) {
if (chartCellLabel) {
if (sourcePos == chartCellLabel->GetCoverage().GetEndPos()) {
// end of child range. push an empty word to denote non-term
ruleSourceFromInputPath.push_back(NULL);
++chartCellIndex;
chartCellLabel = (chartCellIndex < m_stackVec.size()) ? m_stackVec[chartCellIndex] : NULL;
} else if (sourcePos >= chartCellLabel->GetCoverage().GetStartPos()) {
// in the range of child hypo. do nothing
} else {
// not yet reached child range. add word
ruleSourceFromInputPath.push_back(&inputPath->GetPhrase().GetWord(ind));
}
} else {
// no child in sight. add word
ruleSourceFromInputPath.push_back(&inputPath->GetPhrase().GetWord(ind));
}
}
// save it to each trans opt
CollType::iterator iter;
for (iter = m_collection.begin(); iter != m_collection.end(); ++iter) {
ChartTranslationOption &transOpt = **iter;
transOpt.SetSourceRuleFromInputPath(&ruleSourceFromInputPath);
}
}
}