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https://github.com/moses-smt/mosesdecoder.git
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142 lines
4.6 KiB
C++
142 lines
4.6 KiB
C++
// $Id$
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/***********************************************************************
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Moses - factored phrase-based language decoder
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Copyright (C) 2006 University of Edinburgh
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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 "TranslationOptionCollectionText.h"
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#include "Sentence.h"
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#include "DecodeStep.h"
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#include "DecodeStepTranslation.h"
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#include "FactorCollection.h"
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#include "WordsRange.h"
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#include <list>
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using namespace std;
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namespace Moses
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{
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/** constructor; just initialize the base class */
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TranslationOptionCollectionText::TranslationOptionCollectionText(Sentence const &input, size_t maxNoTransOptPerCoverage, float translationOptionThreshold)
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: TranslationOptionCollection(input, maxNoTransOptPerCoverage, translationOptionThreshold)
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{
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size_t size = input.GetSize();
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m_targetPhrasesfromPt.resize(size);
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for (size_t phaseSize = 1; phaseSize <= size; ++phaseSize) {
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for (size_t startPos = 0; startPos < size - phaseSize + 1; ++startPos) {
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size_t endPos = startPos + phaseSize -1;
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vector<InputPath*> &vec = m_targetPhrasesfromPt[startPos];
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Phrase subphrase(input.GetSubString(WordsRange(startPos, endPos)));
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WordsRange range(startPos, endPos);
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InputPath *node;
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if (range.GetNumWordsCovered() == 1) {
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node = new InputPath(subphrase, range, NULL, NULL);
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vec.push_back(node);
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} else {
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const InputPath &prevNode = GetInputPath(startPos, endPos - 1);
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node = new InputPath(subphrase, range, &prevNode, NULL);
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vec.push_back(node);
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}
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m_phraseDictionaryQueue.push_back(node);
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}
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}
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}
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/* forcibly create translation option for a particular source word.
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* For text, this function is easy, just call the base class' ProcessOneUnknownWord()
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*/
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void TranslationOptionCollectionText::ProcessUnknownWord(size_t sourcePos)
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{
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const Word &sourceWord = m_source.GetWord(sourcePos);
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ProcessOneUnknownWord(sourceWord,sourcePos);
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}
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/**
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* Check the source sentence for coverage data
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*/
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bool TranslationOptionCollectionText::HasXmlOptionsOverlappingRange(size_t startPosition, size_t endPosition) const
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{
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Sentence const& source=dynamic_cast<Sentence const&>(m_source);
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return source.XmlOverlap(startPosition,endPosition);
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}
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/**
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* Create xml-based translation options for the specific input span
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*/
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void TranslationOptionCollectionText::CreateXmlOptionsForRange(size_t startPosition, size_t endPosition)
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{
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Sentence const& source=dynamic_cast<Sentence const&>(m_source);
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vector <TranslationOption*> xmlOptions;
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source.GetXmlTranslationOptions(xmlOptions,startPosition,endPosition);
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//get vector of TranslationOptions from Sentence
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for(size_t i=0; i<xmlOptions.size(); i++) {
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Add(xmlOptions[i]);
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}
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};
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InputPath &TranslationOptionCollectionText::GetInputPath(size_t startPos, size_t endPos)
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{
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size_t offset = endPos - startPos;
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CHECK(offset < m_targetPhrasesfromPt[startPos].size());
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return *m_targetPhrasesfromPt[startPos][offset];
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}
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void TranslationOptionCollectionText::CreateTranslationOptions()
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{
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SetTargetPhraseFromPtMatrix();
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TranslationOptionCollection::CreateTranslationOptions();
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}
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/** create translation options that exactly cover a specific input span.
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* Called by CreateTranslationOptions() and ProcessUnknownWord()
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* \param decodeGraph list of decoding steps
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* \param factorCollection input sentence with all factors
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* \param startPos first position in input sentence
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* \param lastPos last position in input sentence
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* \param adhereTableLimit whether phrase & generation table limits are adhered to
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*/
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void TranslationOptionCollectionText::CreateTranslationOptionsForRange(
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const DecodeGraph &decodeGraph
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, size_t startPos
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, size_t endPos
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, bool adhereTableLimit
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, size_t graphInd)
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{
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InputPath &inputPath = GetInputPath(startPos, endPos);
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TranslationOptionCollection::CreateTranslationOptionsForRange(decodeGraph
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, startPos
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, endPos
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, adhereTableLimit
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, graphInd
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, inputPath);
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}
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}
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