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https://github.com/moses-smt/mosesdecoder.git
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170 lines
6.7 KiB
C++
170 lines
6.7 KiB
C++
// $Id$
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// vim:tabstop=2
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/***********************************************************************
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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 "ChartParser.h"
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#include "ChartParserCallback.h"
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#include "ChartRuleLookupManager.h"
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#include "DummyScoreProducers.h"
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#include "StaticData.h"
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#include "TreeInput.h"
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using namespace std;
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using namespace Moses;
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namespace Moses
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{
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extern bool g_debug;
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ChartParserUnknown::ChartParserUnknown(const TranslationSystem &system) : m_system(system) {}
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ChartParserUnknown::~ChartParserUnknown() {
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RemoveAllInColl(m_unksrcs);
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RemoveAllInColl(m_cacheTargetPhraseCollection);
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}
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void ChartParserUnknown::Process(const Word &sourceWord, const WordsRange &range, ChartParserCallback &to) {
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// unknown word, add as trans opt
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const StaticData &staticData = StaticData::Instance();
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const UnknownWordPenaltyProducer *unknownWordPenaltyProducer = m_system.GetUnknownWordPenaltyProducer();
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vector<float> wordPenaltyScore(1, -0.434294482); // TODO what is this number?
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size_t isDigit = 0;
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if (staticData.GetDropUnknown()) {
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const Factor *f = sourceWord[0]; // TODO hack. shouldn't know which factor is surface
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const string &s = f->GetString();
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isDigit = s.find_first_of("0123456789");
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if (isDigit == string::npos)
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isDigit = 0;
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else
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isDigit = 1;
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// modify the starting bitmap
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}
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Phrase* unksrc = new Phrase(1);
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unksrc->AddWord() = sourceWord;
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m_unksrcs.push_back(unksrc);
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//TranslationOption *transOpt;
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if (! staticData.GetDropUnknown() || isDigit) {
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// loop
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const UnknownLHSList &lhsList = staticData.GetUnknownLHS();
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UnknownLHSList::const_iterator iterLHS;
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for (iterLHS = lhsList.begin(); iterLHS != lhsList.end(); ++iterLHS) {
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const string &targetLHSStr = iterLHS->first;
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float prob = iterLHS->second;
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// lhs
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//const Word &sourceLHS = staticData.GetInputDefaultNonTerminal();
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Word targetLHS(true);
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targetLHS.CreateFromString(Output, staticData.GetOutputFactorOrder(), targetLHSStr, true);
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CHECK(targetLHS.GetFactor(0) != NULL);
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// add to dictionary
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TargetPhrase *targetPhrase = new TargetPhrase();
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Word &targetWord = targetPhrase->AddWord();
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targetWord.CreateUnknownWord(sourceWord);
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// scores
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vector<float> unknownScore(1, FloorScore(TransformScore(prob)));
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//targetPhrase->SetScore();
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targetPhrase->SetScore(unknownWordPenaltyProducer, unknownScore);
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targetPhrase->SetScore(m_system.GetWordPenaltyProducer(), wordPenaltyScore);
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targetPhrase->SetSourcePhrase(*unksrc);
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targetPhrase->SetTargetLHS(targetLHS);
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// chart rule
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to.AddPhraseOOV(*targetPhrase, m_cacheTargetPhraseCollection, range);
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} // for (iterLHS
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} else {
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// drop source word. create blank trans opt
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vector<float> unknownScore(1, FloorScore(-numeric_limits<float>::infinity()));
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TargetPhrase *targetPhrase = new TargetPhrase();
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// loop
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const UnknownLHSList &lhsList = staticData.GetUnknownLHS();
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UnknownLHSList::const_iterator iterLHS;
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for (iterLHS = lhsList.begin(); iterLHS != lhsList.end(); ++iterLHS) {
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const string &targetLHSStr = iterLHS->first;
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//float prob = iterLHS->second;
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Word targetLHS(true);
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targetLHS.CreateFromString(Output, staticData.GetOutputFactorOrder(), targetLHSStr, true);
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CHECK(targetLHS.GetFactor(0) != NULL);
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targetPhrase->SetSourcePhrase(*unksrc);
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targetPhrase->SetScore(unknownWordPenaltyProducer, unknownScore);
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targetPhrase->SetTargetLHS(targetLHS);
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// chart rule
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to.AddPhraseOOV(*targetPhrase, m_cacheTargetPhraseCollection, range);
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}
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}
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}
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ChartParser::ChartParser(InputType const &source, const TranslationSystem &system, ChartCellCollectionBase &cells) :
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m_unknown(system),
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m_decodeGraphList(system.GetDecodeGraphs()),
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m_source(source) {
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system.InitializeBeforeSentenceProcessing(source);
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const std::vector<PhraseDictionaryFeature*> &dictionaries = system.GetPhraseDictionaries();
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m_ruleLookupManagers.reserve(dictionaries.size());
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for (std::vector<PhraseDictionaryFeature*>::const_iterator p = dictionaries.begin();
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p != dictionaries.end(); ++p) {
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PhraseDictionaryFeature *pdf = *p;
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const PhraseDictionary *dict = pdf->GetDictionary();
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PhraseDictionary *nonConstDict = const_cast<PhraseDictionary*>(dict);
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m_ruleLookupManagers.push_back(nonConstDict->CreateRuleLookupManager(source, cells));
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}
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}
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ChartParser::~ChartParser() {
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RemoveAllInColl(m_ruleLookupManagers);
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}
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void ChartParser::Create(const WordsRange &wordsRange, ChartParserCallback &to) {
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assert(m_decodeGraphList.size() == m_ruleLookupManagers.size());
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std::vector <DecodeGraph*>::const_iterator iterDecodeGraph;
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std::vector <ChartRuleLookupManager*>::const_iterator iterRuleLookupManagers = m_ruleLookupManagers.begin();
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for (iterDecodeGraph = m_decodeGraphList.begin(); iterDecodeGraph != m_decodeGraphList.end(); ++iterDecodeGraph, ++iterRuleLookupManagers) {
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const DecodeGraph &decodeGraph = **iterDecodeGraph;
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assert(decodeGraph.GetSize() == 1);
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ChartRuleLookupManager &ruleLookupManager = **iterRuleLookupManagers;
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size_t maxSpan = decodeGraph.GetMaxChartSpan();
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if (maxSpan == 0 || wordsRange.GetNumWordsCovered() <= maxSpan) {
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ruleLookupManager.GetChartRuleCollection(wordsRange, to);
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}
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}
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if (wordsRange.GetNumWordsCovered() == 1 && wordsRange.GetStartPos() != 0 && wordsRange.GetStartPos() != m_source.GetSize()-1) {
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bool alwaysCreateDirectTranslationOption = StaticData::Instance().IsAlwaysCreateDirectTranslationOption();
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if (to.Empty() || alwaysCreateDirectTranslationOption) {
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// create unknown words for 1 word coverage where we don't have any trans options
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const Word &sourceWord = m_source.GetWord(wordsRange.GetStartPos());
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m_unknown.Process(sourceWord, wordsRange, to);
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}
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}
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}
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} // namespace Moses
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