mirror of
https://github.com/moses-smt/mosesdecoder.git
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139 lines
4.6 KiB
C++
139 lines
4.6 KiB
C++
/***********************************************************************
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Moses - factored phrase-based language decoder
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Copyright (C) 2010 Hieu Hoang
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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***********************************************************************/
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#include "ChartTranslationOptions.h"
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#include "ChartHypothesis.h"
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#include "ChartCellLabel.h"
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#include "ChartTranslationOption.h"
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#include "InputPath.h"
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#include "StaticData.h"
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using namespace std;
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namespace Moses
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{
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ChartTranslationOptions::ChartTranslationOptions(const TargetPhraseCollection &targetPhraseColl,
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const StackVec &stackVec,
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const WordsRange &wordsRange,
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float score)
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: m_stackVec(stackVec)
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, m_wordsRange(&wordsRange)
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, m_estimateOfBestScore(score)
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{
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TargetPhraseCollection::const_iterator iter;
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for (iter = targetPhraseColl.begin(); iter != targetPhraseColl.end(); ++iter) {
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const TargetPhrase *origTP = *iter;
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boost::shared_ptr<ChartTranslationOption> ptr(new ChartTranslationOption(*origTP));
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m_collection.push_back(ptr);
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}
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}
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ChartTranslationOptions::~ChartTranslationOptions()
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{
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}
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float ChartTranslationOptions::CalcEstimateOfBestScore(
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const TargetPhraseCollection &tpc,
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const StackVec &stackVec)
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{
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const TargetPhrase &targetPhrase = **(tpc.begin());
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float estimateOfBestScore = targetPhrase.GetFutureScore();
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for (StackVec::const_iterator p = stackVec.begin(); p != stackVec.end();
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++p) {
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const HypoList *stack = (*p)->GetStack().cube;
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assert(stack);
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assert(!stack->empty());
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const ChartHypothesis &bestHypo = **(stack->begin());
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estimateOfBestScore += bestHypo.GetTotalScore();
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}
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return estimateOfBestScore;
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}
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void ChartTranslationOptions::Evaluate(const InputType &input, const InputPath &inputPath)
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{
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SetInputPath(&inputPath);
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if (StaticData::Instance().GetPlaceholderFactor() != NOT_FOUND) {
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CreateSourceRuleFromInputPath();
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}
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CollType::iterator iter;
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for (iter = m_collection.begin(); iter != m_collection.end(); ++iter) {
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ChartTranslationOption &transOpt = **iter;
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transOpt.SetInputPath(&inputPath);
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transOpt.Evaluate(input, inputPath);
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}
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}
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void ChartTranslationOptions::SetInputPath(const InputPath *inputPath)
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{
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CollType::iterator iter;
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for (iter = m_collection.begin(); iter != m_collection.end(); ++iter) {
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ChartTranslationOption &transOpt = **iter;
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transOpt.SetInputPath(inputPath);
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}
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}
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void ChartTranslationOptions::CreateSourceRuleFromInputPath()
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{
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if (m_collection.size() == 0) {
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return;
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}
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const InputPath *inputPath = m_collection.front()->GetInputPath();
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CHECK(inputPath);
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std::vector<const Word*> &ruleSourceFromInputPath = inputPath->AddRuleSourceFromInputPath();
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size_t chartCellIndex = 0;
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const ChartCellLabel *chartCellLabel = (chartCellIndex < m_stackVec.size()) ? m_stackVec[chartCellIndex] : NULL;
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size_t ind = 0;
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for (size_t sourcePos = m_wordsRange->GetStartPos(); sourcePos <= m_wordsRange->GetEndPos(); ++sourcePos, ++ind) {
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if (chartCellLabel) {
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if (sourcePos == chartCellLabel->GetCoverage().GetEndPos()) {
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// end of child range. push an empty word to denote non-term
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ruleSourceFromInputPath.push_back(NULL);
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++chartCellIndex;
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chartCellLabel = (chartCellIndex < m_stackVec.size()) ? m_stackVec[chartCellIndex] : NULL;
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} else if (sourcePos >= chartCellLabel->GetCoverage().GetStartPos()) {
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// in the range of child hypo. do nothing
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} else {
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// not yet reached child range. add word
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ruleSourceFromInputPath.push_back(&inputPath->GetPhrase().GetWord(ind));
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}
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} else {
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// no child in sight. add word
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ruleSourceFromInputPath.push_back(&inputPath->GetPhrase().GetWord(ind));
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}
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}
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// save it to each trans opt
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CollType::iterator iter;
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for (iter = m_collection.begin(); iter != m_collection.end(); ++iter) {
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ChartTranslationOption &transOpt = **iter;
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transOpt.SetSourceRuleFromInputPath(&ruleSourceFromInputPath);
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}
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}
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}
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