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