mirror of
https://github.com/moses-smt/mosesdecoder.git
synced 2024-12-25 04:43:03 +03:00
745 lines
30 KiB
C++
745 lines
30 KiB
C++
// $Id$
|
|
// vim:tabstop=2
|
|
|
|
/***********************************************************************
|
|
Moses - factored phrase-based language decoder
|
|
Copyright (C) 2006 University of Edinburgh
|
|
|
|
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 <typeinfo>
|
|
#include <algorithm>
|
|
#include <typeinfo>
|
|
#include "TranslationOptionCollection.h"
|
|
#include "Sentence.h"
|
|
#include "DecodeStep.h"
|
|
#include "LM/Base.h"
|
|
#include "FactorCollection.h"
|
|
#include "InputType.h"
|
|
#include "Util.h"
|
|
#include "StaticData.h"
|
|
#include "DecodeStepTranslation.h"
|
|
#include "DecodeStepGeneration.h"
|
|
#include "DecodeGraph.h"
|
|
#include "InputPath.h"
|
|
#include "moses/FF/UnknownWordPenaltyProducer.h"
|
|
#include "moses/FF/LexicalReordering/LexicalReordering.h"
|
|
#include "moses/FF/InputFeature.h"
|
|
#include "util/exception.hh"
|
|
|
|
using namespace std;
|
|
|
|
namespace Moses
|
|
{
|
|
|
|
/** helper for pruning */
|
|
bool CompareTranslationOption(const TranslationOption *a, const TranslationOption *b)
|
|
{
|
|
return a->GetFutureScore() > b->GetFutureScore();
|
|
}
|
|
|
|
/** constructor; since translation options are indexed by coverage span, the corresponding data structure is initialized here
|
|
* This fn should be called by inherited classes
|
|
*/
|
|
TranslationOptionCollection::TranslationOptionCollection(
|
|
InputType const& src, size_t maxNoTransOptPerCoverage, float translationOptionThreshold)
|
|
: m_source(src)
|
|
,m_futureScore(src.GetSize())
|
|
,m_maxNoTransOptPerCoverage(maxNoTransOptPerCoverage)
|
|
,m_translationOptionThreshold(translationOptionThreshold)
|
|
{
|
|
// create 2-d vector
|
|
size_t size = src.GetSize();
|
|
for (size_t startPos = 0 ; startPos < size ; ++startPos) {
|
|
m_collection.push_back( vector< TranslationOptionList >() );
|
|
|
|
size_t maxSize = size - startPos;
|
|
size_t maxSizePhrase = StaticData::Instance().GetMaxPhraseLength();
|
|
maxSize = std::min(maxSize, maxSizePhrase);
|
|
|
|
for (size_t endPos = 0 ; endPos < maxSize ; ++endPos) {
|
|
m_collection[startPos].push_back( TranslationOptionList() );
|
|
}
|
|
}
|
|
}
|
|
|
|
/** destructor, clears out data structures */
|
|
TranslationOptionCollection::~TranslationOptionCollection()
|
|
{
|
|
RemoveAllInColl(m_inputPathQueue);
|
|
}
|
|
|
|
void TranslationOptionCollection::Prune()
|
|
{
|
|
// quit, if max size, threshold
|
|
if (m_maxNoTransOptPerCoverage == 0 && m_translationOptionThreshold == -std::numeric_limits<float>::infinity())
|
|
return;
|
|
|
|
// bookkeeping for how many options used, pruned
|
|
size_t total = 0;
|
|
size_t totalPruned = 0;
|
|
|
|
// loop through all spans
|
|
size_t size = m_source.GetSize();
|
|
for (size_t startPos = 0 ; startPos < size; ++startPos) {
|
|
size_t maxSize = size - startPos;
|
|
size_t maxSizePhrase = StaticData::Instance().GetMaxPhraseLength();
|
|
maxSize = std::min(maxSize, maxSizePhrase);
|
|
|
|
for (size_t endPos = startPos ; endPos < startPos + maxSize ; ++endPos) {
|
|
// consider list for a span
|
|
TranslationOptionList &fullList = GetTranslationOptionList(startPos, endPos);
|
|
total += fullList.size();
|
|
|
|
// size pruning
|
|
if (m_maxNoTransOptPerCoverage > 0 &&
|
|
fullList.size() > m_maxNoTransOptPerCoverage) {
|
|
// sort in vector
|
|
NTH_ELEMENT4(fullList.begin(), fullList.begin() + m_maxNoTransOptPerCoverage, fullList.end(), CompareTranslationOption);
|
|
totalPruned += fullList.size() - m_maxNoTransOptPerCoverage;
|
|
|
|
// delete the rest
|
|
for (size_t i = m_maxNoTransOptPerCoverage ; i < fullList.size() ; ++i) {
|
|
delete fullList.Get(i);
|
|
}
|
|
fullList.resize(m_maxNoTransOptPerCoverage);
|
|
}
|
|
|
|
// threshold pruning
|
|
if (fullList.size() > 1 && m_translationOptionThreshold != -std::numeric_limits<float>::infinity()) {
|
|
// first, find the best score
|
|
float bestScore = -std::numeric_limits<float>::infinity();
|
|
for (size_t i=0; i < fullList.size() ; ++i) {
|
|
if (fullList.Get(i)->GetFutureScore() > bestScore)
|
|
bestScore = fullList.Get(i)->GetFutureScore();
|
|
}
|
|
//std::cerr << "best score for span " << startPos << "-" << endPos << " is " << bestScore << "\n";
|
|
// then, remove items that are worse than best score + threshold
|
|
for (size_t i=0; i < fullList.size() ; ++i) {
|
|
if (fullList.Get(i)->GetFutureScore() < bestScore + m_translationOptionThreshold) {
|
|
//std::cerr << "\tremoving item " << i << ", score " << fullList.Get(i)->GetFutureScore() << ": " << fullList.Get(i)->GetTargetPhrase() << "\n";
|
|
delete fullList.Get(i);
|
|
fullList.Remove(i);
|
|
total--;
|
|
totalPruned++;
|
|
i--;
|
|
}
|
|
//else
|
|
//{
|
|
// std::cerr << "\tkeeping item " << i << ", score " << fullList.Get(i)->GetFutureScore() << ": " << fullList.Get(i)->GetTargetPhrase() << "\n";
|
|
//}
|
|
}
|
|
} // end of threshold pruning
|
|
}
|
|
} // end of loop through all spans
|
|
|
|
VERBOSE(2," Total translation options: " << total << std::endl
|
|
<< "Total translation options pruned: " << totalPruned << std::endl);
|
|
}
|
|
|
|
/** Force a creation of a translation option where there are none for a particular source position.
|
|
* ie. where a source word has not been translated, create a translation option by
|
|
* 1. not observing the table limits on phrase/generation tables
|
|
* 2. using the handler ProcessUnknownWord()
|
|
* Call this function once translation option collection has been filled with translation options
|
|
*
|
|
* This function calls for unknown words is complicated by the fact it must handle different input types.
|
|
* The call stack is
|
|
* Base::ProcessUnknownWord()
|
|
* Inherited::ProcessUnknownWord(position)
|
|
* Base::ProcessOneUnknownWord()
|
|
*
|
|
*/
|
|
|
|
void TranslationOptionCollection::ProcessUnknownWord()
|
|
{
|
|
const vector<DecodeGraph*>& decodeGraphList = StaticData::Instance().GetDecodeGraphs();
|
|
size_t size = m_source.GetSize();
|
|
// try to translation for coverage with no trans by expanding table limit
|
|
for (size_t graphInd = 0 ; graphInd < decodeGraphList.size() ; graphInd++) {
|
|
const DecodeGraph &decodeGraph = *decodeGraphList[graphInd];
|
|
for (size_t pos = 0 ; pos < size ; ++pos) {
|
|
TranslationOptionList &fullList = GetTranslationOptionList(pos, pos);
|
|
size_t numTransOpt = fullList.size();
|
|
if (numTransOpt == 0) {
|
|
CreateTranslationOptionsForRange(decodeGraph, pos, pos, false, graphInd);
|
|
}
|
|
}
|
|
}
|
|
|
|
bool alwaysCreateDirectTranslationOption = StaticData::Instance().IsAlwaysCreateDirectTranslationOption();
|
|
// create unknown words for 1 word coverage where we don't have any trans options
|
|
for (size_t pos = 0 ; pos < size ; ++pos) {
|
|
TranslationOptionList &fullList = GetTranslationOptionList(pos, pos);
|
|
if (fullList.size() == 0 || alwaysCreateDirectTranslationOption)
|
|
ProcessUnknownWord(pos);
|
|
}
|
|
}
|
|
|
|
/** special handling of ONE unknown words. Either add temporarily add word to translation table,
|
|
* or drop the translation.
|
|
* This function should be called by the ProcessOneUnknownWord() in the inherited class
|
|
* At the moment, this unknown word handler is a bit of a hack, if copies over each factor from source
|
|
* to target word, or uses the 'UNK' factor.
|
|
* Ideally, this function should be in a class which can be expanded upon, for example,
|
|
* to create a morphologically aware handler.
|
|
*
|
|
* \param sourceWord the unknown word
|
|
* \param sourcePos
|
|
* \param length length covered by this word (may be > 1 for lattice input)
|
|
* \param inputScores a set of scores associated with unknown word (input scores from latties/CNs)
|
|
*/
|
|
void TranslationOptionCollection::ProcessOneUnknownWord(const InputPath &inputPath,
|
|
size_t sourcePos,
|
|
size_t length,
|
|
const ScorePair *inputScores)
|
|
{
|
|
const StaticData &staticData = StaticData::Instance();
|
|
const UnknownWordPenaltyProducer &unknownWordPenaltyProducer = UnknownWordPenaltyProducer::Instance();
|
|
float unknownScore = FloorScore(TransformScore(0));
|
|
const Word &sourceWord = inputPath.GetPhrase().GetWord(0);
|
|
|
|
// hack. Once the OOV FF is a phrase table, get rid of this
|
|
PhraseDictionary *firstPt = NULL;
|
|
if (PhraseDictionary::GetColl().size() == 0) {
|
|
firstPt = PhraseDictionary::GetColl()[0];
|
|
}
|
|
|
|
// unknown word, add as trans opt
|
|
FactorCollection &factorCollection = FactorCollection::Instance();
|
|
|
|
size_t isDigit = 0;
|
|
|
|
const Factor *f = sourceWord[0]; // TODO hack. shouldn't know which factor is surface
|
|
const StringPiece s = f->GetString();
|
|
bool isEpsilon = (s=="" || s==EPSILON);
|
|
if (StaticData::Instance().GetDropUnknown()) {
|
|
|
|
|
|
isDigit = s.find_first_of("0123456789");
|
|
if (isDigit == string::npos)
|
|
isDigit = 0;
|
|
else
|
|
isDigit = 1;
|
|
// modify the starting bitmap
|
|
}
|
|
|
|
TargetPhrase targetPhrase(firstPt);
|
|
|
|
if (!(staticData.GetDropUnknown() || isEpsilon) || isDigit) {
|
|
// add to dictionary
|
|
|
|
Word &targetWord = targetPhrase.AddWord();
|
|
targetWord.SetIsOOV(true);
|
|
|
|
for (unsigned int currFactor = 0 ; currFactor < MAX_NUM_FACTORS ; currFactor++) {
|
|
FactorType factorType = static_cast<FactorType>(currFactor);
|
|
|
|
const Factor *sourceFactor = sourceWord[currFactor];
|
|
if (sourceFactor == NULL)
|
|
targetWord[factorType] = factorCollection.AddFactor(UNKNOWN_FACTOR);
|
|
else
|
|
targetWord[factorType] = factorCollection.AddFactor(sourceFactor->GetString());
|
|
}
|
|
//create a one-to-one alignment between UNKNOWN_FACTOR and its verbatim translation
|
|
|
|
targetPhrase.SetAlignmentInfo("0-0");
|
|
|
|
} else {
|
|
// drop source word. create blank trans opt
|
|
|
|
//targetPhrase.SetAlignment();
|
|
|
|
}
|
|
|
|
targetPhrase.GetScoreBreakdown().Assign(&unknownWordPenaltyProducer, unknownScore);
|
|
|
|
// source phrase
|
|
const Phrase &sourcePhrase = inputPath.GetPhrase();
|
|
m_unksrcs.push_back(&sourcePhrase);
|
|
WordsRange range(sourcePos, sourcePos + length - 1);
|
|
|
|
targetPhrase.EvaluateInIsolation(sourcePhrase);
|
|
|
|
TranslationOption *transOpt = new TranslationOption(range, targetPhrase);
|
|
transOpt->SetInputPath(inputPath);
|
|
Add(transOpt);
|
|
|
|
|
|
}
|
|
|
|
/** compute future score matrix in a dynamic programming fashion.
|
|
* This matrix used in search.
|
|
* Call this function once translation option collection has been filled with translation options
|
|
*/
|
|
void TranslationOptionCollection::CalcFutureScore()
|
|
{
|
|
// setup the matrix (ignore lower triangle, set upper triangle to -inf
|
|
size_t size = m_source.GetSize(); // the width of the matrix
|
|
|
|
for(size_t row=0; row<size; row++) {
|
|
for(size_t col=row; col<size; col++) {
|
|
m_futureScore.SetScore(row, col, -numeric_limits<float>::infinity());
|
|
}
|
|
}
|
|
|
|
// walk all the translation options and record the cheapest option for each span
|
|
for (size_t startPos = 0 ; startPos < size ; ++startPos) {
|
|
size_t maxSize = m_source.GetSize() - startPos;
|
|
size_t maxSizePhrase = StaticData::Instance().GetMaxPhraseLength();
|
|
maxSize = std::min(maxSize, maxSizePhrase);
|
|
|
|
for (size_t endPos = startPos ; endPos < startPos + maxSize ; ++endPos) {
|
|
TranslationOptionList &transOptList = GetTranslationOptionList(startPos, endPos);
|
|
|
|
TranslationOptionList::const_iterator iterTransOpt;
|
|
for(iterTransOpt = transOptList.begin() ; iterTransOpt != transOptList.end() ; ++iterTransOpt) {
|
|
const TranslationOption &transOpt = **iterTransOpt;
|
|
float score = transOpt.GetFutureScore();
|
|
if (score > m_futureScore.GetScore(startPos, endPos))
|
|
m_futureScore.SetScore(startPos, endPos, score);
|
|
}
|
|
}
|
|
}
|
|
|
|
// now fill all the cells in the strictly upper triangle
|
|
// there is no way to modify the diagonal now, in the case
|
|
// where no translation option covers a single-word span,
|
|
// we leave the +inf in the matrix
|
|
// like in chart parsing we want each cell to contain the highest score
|
|
// of the full-span trOpt or the sum of scores of joining two smaller spans
|
|
|
|
for(size_t colstart = 1; colstart < size ; colstart++) {
|
|
for(size_t diagshift = 0; diagshift < size-colstart ; diagshift++) {
|
|
size_t startPos = diagshift;
|
|
size_t endPos = colstart+diagshift;
|
|
for(size_t joinAt = startPos; joinAt < endPos ; joinAt++) {
|
|
float joinedScore = m_futureScore.GetScore(startPos, joinAt)
|
|
+ m_futureScore.GetScore(joinAt+1, endPos);
|
|
/* // uncomment to see the cell filling scheme
|
|
TRACE_ERR( "[" <<startPos<<","<<endPos<<"] <-? ["<<startPos<<","<<joinAt<<"]+["<<joinAt+1<<","<<endPos
|
|
<< "] (colstart: "<<colstart<<", diagshift: "<<diagshift<<")"<<endl);
|
|
*/
|
|
if (joinedScore > m_futureScore.GetScore(startPos, endPos))
|
|
m_futureScore.SetScore(startPos, endPos, joinedScore);
|
|
}
|
|
}
|
|
}
|
|
|
|
IFVERBOSE(3) {
|
|
int total = 0;
|
|
for(size_t row=0; row<size; row++) {
|
|
size_t maxSize = size - row;
|
|
size_t maxSizePhrase = StaticData::Instance().GetMaxPhraseLength();
|
|
maxSize = std::min(maxSize, maxSizePhrase);
|
|
|
|
for(size_t col=row; col<row+maxSize; col++) {
|
|
int count = GetTranslationOptionList(row, col).size();
|
|
TRACE_ERR( "translation options spanning from "
|
|
<< row <<" to "<< col <<" is "
|
|
<< count <<endl);
|
|
total += count;
|
|
}
|
|
}
|
|
TRACE_ERR( "translation options generated in total: "<< total << endl);
|
|
|
|
for(size_t row=0; row<size; row++)
|
|
for(size_t col=row; col<size; col++)
|
|
TRACE_ERR( "future cost from "<< row <<" to "<< col <<" is "<< m_futureScore.GetScore(row, col) <<endl);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/** Create all possible translations from the phrase tables
|
|
* for a particular input sentence. This implies applying all
|
|
* translation and generation steps. Also computes future cost matrix.
|
|
*/
|
|
void TranslationOptionCollection::CreateTranslationOptions()
|
|
{
|
|
// loop over all substrings of the source sentence, look them up
|
|
// in the phraseDictionary (which is the- possibly filtered-- phrase
|
|
// table loaded on initialization), generate TranslationOption objects
|
|
// for all phrases
|
|
|
|
// there may be multiple decoding graphs (factorizations of decoding)
|
|
const vector <DecodeGraph*> &decodeGraphList = StaticData::Instance().GetDecodeGraphs();
|
|
|
|
// length of the sentence
|
|
const size_t size = m_source.GetSize();
|
|
|
|
// loop over all decoding graphs, each generates translation options
|
|
for (size_t graphInd = 0 ; graphInd < decodeGraphList.size() ; graphInd++) {
|
|
if (decodeGraphList.size() > 1) {
|
|
VERBOSE(3,"Creating translation options from decoding graph " << graphInd << endl);
|
|
}
|
|
|
|
const DecodeGraph &decodeGraph = *decodeGraphList[graphInd];
|
|
size_t backoff = decodeGraph.GetBackoff();
|
|
// generate phrases that start at startPos ...
|
|
// VERBOSE(1,"TranslationOptionCollection::CreateTranslationOptions() graphInd:" << graphInd << endl);
|
|
for (size_t startPos = 0 ; startPos < size; startPos++) {
|
|
// VERBOSE(1,"TranslationOptionCollection::CreateTranslationOptions() startPos:" << startPos << endl);
|
|
size_t maxSize = size - startPos; // don't go over end of sentence
|
|
size_t maxSizePhrase = StaticData::Instance().GetMaxPhraseLength();
|
|
maxSize = std::min(maxSize, maxSizePhrase);
|
|
|
|
// ... and that end at endPos
|
|
for (size_t endPos = startPos ; endPos < startPos + maxSize ; endPos++) {
|
|
// VERBOSE(1,"TranslationOptionCollection::CreateTranslationOptions() endPos:" << endPos << endl);
|
|
if (graphInd > 0 && // only skip subsequent graphs
|
|
backoff != 0 && // use of backoff specified
|
|
(endPos-startPos+1 <= backoff || // size exceeds backoff limit or ...
|
|
m_collection[startPos][endPos-startPos].size() > 0)) { // no phrases found so far
|
|
VERBOSE(3,"No backoff to graph " << graphInd << " for span [" << startPos << ";" << endPos << "]" << endl);
|
|
// do not create more options
|
|
// VERBOSE(1,"TranslationOptionCollection::CreateTranslationOptions() continue:" << endl);
|
|
continue;
|
|
}
|
|
|
|
// create translation options for that range
|
|
// VERBOSE(1,"TranslationOptionCollection::CreateTranslationOptions() before CreateTranslationOptionsForRange" << endl);
|
|
CreateTranslationOptionsForRange( decodeGraph, startPos, endPos, true, graphInd);
|
|
// VERBOSE(1,"TranslationOptionCollection::CreateTranslationOptions() after CreateTranslationOptionsForRange" << endl);
|
|
}
|
|
}
|
|
}
|
|
|
|
VERBOSE(3,"Translation Option Collection\n " << *this << endl);
|
|
|
|
ProcessUnknownWord();
|
|
|
|
EvaluateWithSourceContext();
|
|
|
|
// Prune
|
|
Prune();
|
|
|
|
Sort();
|
|
|
|
// future score matrix
|
|
CalcFutureScore();
|
|
|
|
// Cached lex reodering costs
|
|
CacheLexReordering();
|
|
}
|
|
|
|
void TranslationOptionCollection::CreateTranslationOptionsForRange(
|
|
const DecodeGraph &decodeGraph
|
|
, size_t startPos
|
|
, size_t endPos
|
|
, bool adhereTableLimit
|
|
, size_t graphInd
|
|
, InputPath &inputPath)
|
|
{
|
|
//VERBOSE(1,"TranslationOptionCollection::CreateTranslationOptionsForRange() START startPos:" << startPos << " endPos:" << endPos << endl);
|
|
if ((StaticData::Instance().GetXmlInputType() != XmlExclusive) || !HasXmlOptionsOverlappingRange(startPos,endPos)) {
|
|
|
|
// partial trans opt stored in here
|
|
PartialTranslOptColl* oldPtoc = new PartialTranslOptColl;
|
|
size_t totalEarlyPruned = 0;
|
|
|
|
// initial translation step
|
|
list <const DecodeStep* >::const_iterator iterStep = decodeGraph.begin();
|
|
const DecodeStep &decodeStep = **iterStep;
|
|
|
|
const PhraseDictionary &phraseDictionary = *decodeStep.GetPhraseDictionaryFeature();
|
|
const TargetPhraseCollection *targetPhrases = inputPath.GetTargetPhrases(phraseDictionary);
|
|
|
|
// VERBOSE(1,"TranslationOptionCollection::CreateTranslationOptionsForRange() before ProcessInitialTranslation" << endl);
|
|
static_cast<const DecodeStepTranslation&>(decodeStep).ProcessInitialTranslation
|
|
(m_source, *oldPtoc
|
|
, startPos, endPos, adhereTableLimit
|
|
, inputPath, targetPhrases);
|
|
// VERBOSE(1,"TranslationOptionCollection::CreateTranslationOptionsForRange() after ProcessInitialTranslation" << endl);
|
|
|
|
SetInputScore(inputPath, *oldPtoc);
|
|
|
|
// do rest of decode steps
|
|
int indexStep = 0;
|
|
|
|
for (++iterStep ; iterStep != decodeGraph.end() ; ++iterStep) {
|
|
|
|
const DecodeStep *decodeStep = *iterStep;
|
|
PartialTranslOptColl* newPtoc = new PartialTranslOptColl;
|
|
|
|
// go thru each intermediate trans opt just created
|
|
const vector<TranslationOption*>& partTransOptList = oldPtoc->GetList();
|
|
vector<TranslationOption*>::const_iterator iterPartialTranslOpt;
|
|
for (iterPartialTranslOpt = partTransOptList.begin() ; iterPartialTranslOpt != partTransOptList.end() ; ++iterPartialTranslOpt) {
|
|
TranslationOption &inputPartialTranslOpt = **iterPartialTranslOpt;
|
|
|
|
if (const DecodeStepTranslation *translateStep = dynamic_cast<const DecodeStepTranslation*>(decodeStep) ) {
|
|
const PhraseDictionary &phraseDictionary = *translateStep->GetPhraseDictionaryFeature();
|
|
const TargetPhraseCollection *targetPhrases = inputPath.GetTargetPhrases(phraseDictionary);
|
|
translateStep->Process(inputPartialTranslOpt
|
|
, *decodeStep
|
|
, *newPtoc
|
|
, this
|
|
, adhereTableLimit
|
|
, targetPhrases);
|
|
} else {
|
|
const DecodeStepGeneration *genStep = dynamic_cast<const DecodeStepGeneration*>(decodeStep);
|
|
assert(genStep);
|
|
genStep->Process(inputPartialTranslOpt
|
|
, *decodeStep
|
|
, *newPtoc
|
|
, this
|
|
, adhereTableLimit);
|
|
}
|
|
}
|
|
|
|
// last but 1 partial trans not required anymore
|
|
totalEarlyPruned += newPtoc->GetPrunedCount();
|
|
delete oldPtoc;
|
|
oldPtoc = newPtoc;
|
|
|
|
indexStep++;
|
|
} // for (++iterStep
|
|
|
|
// add to fully formed translation option list
|
|
PartialTranslOptColl &lastPartialTranslOptColl = *oldPtoc;
|
|
const vector<TranslationOption*>& partTransOptList = lastPartialTranslOptColl.GetList();
|
|
vector<TranslationOption*>::const_iterator iterColl;
|
|
for (iterColl = partTransOptList.begin() ; iterColl != partTransOptList.end() ; ++iterColl) {
|
|
TranslationOption *transOpt = *iterColl;
|
|
if (StaticData::Instance().GetXmlInputType() != XmlConstraint || !ViolatesXmlOptionsConstraint(startPos,endPos,transOpt)) {
|
|
Add(transOpt);
|
|
}
|
|
}
|
|
|
|
lastPartialTranslOptColl.DetachAll();
|
|
totalEarlyPruned += oldPtoc->GetPrunedCount();
|
|
delete oldPtoc;
|
|
// TRACE_ERR( "Early translation options pruned: " << totalEarlyPruned << endl);
|
|
} // if ((StaticData::Instance().GetXmlInputType() != XmlExclusive) || !HasXmlOptionsOverlappingRange(startPos,endPos))
|
|
|
|
// VERBOSE(1,"TranslationOptionCollection::CreateTranslationOptionsForRange() before CreateXmlOptionsForRange" << endl);
|
|
if (graphInd == 0 && StaticData::Instance().GetXmlInputType() != XmlPassThrough && HasXmlOptionsOverlappingRange(startPos,endPos)) {
|
|
CreateXmlOptionsForRange(startPos, endPos);
|
|
}
|
|
// VERBOSE(1,"TranslationOptionCollection::CreateTranslationOptionsForRange() after CreateXmlOptionsForRange" << endl);
|
|
}
|
|
|
|
void TranslationOptionCollection::SetInputScore(const InputPath &inputPath, PartialTranslOptColl &oldPtoc)
|
|
{
|
|
const ScorePair *inputScore = inputPath.GetInputScore();
|
|
if (inputScore == NULL) {
|
|
return;
|
|
}
|
|
|
|
const InputFeature &inputFeature = InputFeature::Instance();
|
|
|
|
const std::vector<TranslationOption*> &transOpts = oldPtoc.GetList();
|
|
for (size_t i = 0; i < transOpts.size(); ++i) {
|
|
TranslationOption &transOpt = *transOpts[i];
|
|
|
|
ScoreComponentCollection &scores = transOpt.GetScoreBreakdown();
|
|
scores.PlusEquals(&inputFeature, *inputScore);
|
|
|
|
}
|
|
}
|
|
|
|
void TranslationOptionCollection::EvaluateWithSourceContext()
|
|
{
|
|
const size_t size = m_source.GetSize();
|
|
for (size_t startPos = 0 ; startPos < size ; ++startPos) {
|
|
size_t maxSize = m_source.GetSize() - startPos;
|
|
size_t maxSizePhrase = StaticData::Instance().GetMaxPhraseLength();
|
|
maxSize = std::min(maxSize, maxSizePhrase);
|
|
|
|
for (size_t endPos = startPos ; endPos < startPos + maxSize ; ++endPos) {
|
|
TranslationOptionList &transOptList = GetTranslationOptionList(startPos, endPos);
|
|
|
|
TranslationOptionList::const_iterator iterTransOpt;
|
|
for(iterTransOpt = transOptList.begin() ; iterTransOpt != transOptList.end() ; ++iterTransOpt) {
|
|
TranslationOption &transOpt = **iterTransOpt;
|
|
transOpt.EvaluateWithSourceContext(m_source);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void TranslationOptionCollection::Sort()
|
|
{
|
|
size_t size = m_source.GetSize();
|
|
for (size_t startPos = 0 ; startPos < size; ++startPos) {
|
|
size_t maxSize = size - startPos;
|
|
size_t maxSizePhrase = StaticData::Instance().GetMaxPhraseLength();
|
|
maxSize = std::min(maxSize, maxSizePhrase);
|
|
|
|
for (size_t endPos = startPos ; endPos < startPos + maxSize; ++endPos) {
|
|
TranslationOptionList &transOptList = GetTranslationOptionList(startPos, endPos);
|
|
std::sort(transOptList.begin(), transOptList.end(), CompareTranslationOption);
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Check if this range overlaps with any XML options. This doesn't need to be an exact match, only an overlap.
|
|
* by default, we don't support XML options. subclasses need to override this function.
|
|
* called by CreateTranslationOptionsForRange()
|
|
* \param startPos first position in input sentence
|
|
* \param lastPos last position in input sentence
|
|
*/
|
|
bool TranslationOptionCollection::HasXmlOptionsOverlappingRange(size_t, size_t) const
|
|
{
|
|
return false;
|
|
//not implemented for base class
|
|
}
|
|
|
|
/** Check if an option conflicts with any constraint XML options. Okay, if XML option is substring in source and target.
|
|
* by default, we don't support XML options. subclasses need to override this function.
|
|
* called by CreateTranslationOptionsForRange()
|
|
* \param startPos first position in input sentence
|
|
* \param lastPos last position in input sentence
|
|
*/
|
|
bool TranslationOptionCollection::ViolatesXmlOptionsConstraint(size_t, size_t, TranslationOption *) const
|
|
{
|
|
return false;
|
|
//not implemented for base class
|
|
}
|
|
|
|
/** Populates the current Collection with XML options exactly covering the range specified. Default implementation does nothing.
|
|
* called by CreateTranslationOptionsForRange()
|
|
* \param startPos first position in input sentence
|
|
* \param lastPos last position in input sentence
|
|
*/
|
|
void TranslationOptionCollection::CreateXmlOptionsForRange(size_t, size_t)
|
|
{
|
|
//not implemented for base class
|
|
};
|
|
|
|
|
|
/** Add translation option to the list
|
|
* \param translationOption translation option to be added */
|
|
void TranslationOptionCollection::Add(TranslationOption *translationOption)
|
|
{
|
|
const WordsRange &coverage = translationOption->GetSourceWordsRange();
|
|
|
|
if (coverage.GetEndPos() - coverage.GetStartPos() >= m_collection[coverage.GetStartPos()].size()) {
|
|
cerr << "translationOption=" << *translationOption << endl;
|
|
cerr << "coverage=" << coverage << endl;
|
|
}
|
|
|
|
UTIL_THROW_IF2(coverage.GetEndPos() - coverage.GetStartPos() >= m_collection[coverage.GetStartPos()].size(),
|
|
"Out of bound access: " << coverage);
|
|
m_collection[coverage.GetStartPos()][coverage.GetEndPos() - coverage.GetStartPos()].Add(translationOption);
|
|
}
|
|
|
|
TO_STRING_BODY(TranslationOptionCollection);
|
|
|
|
std::ostream& operator<<(std::ostream& out, const TranslationOptionCollection& coll)
|
|
{
|
|
size_t size = coll.m_source.GetSize();
|
|
for (size_t startPos = 0 ; startPos < size ; ++startPos) {
|
|
size_t maxSize = size - startPos;
|
|
size_t maxSizePhrase = StaticData::Instance().GetMaxPhraseLength();
|
|
maxSize = std::min(maxSize, maxSizePhrase);
|
|
|
|
for (size_t endPos = startPos ; endPos < startPos + maxSize ; ++endPos) {
|
|
const TranslationOptionList& fullList = coll.GetTranslationOptionList(startPos, endPos);
|
|
size_t sizeFull = fullList.size();
|
|
for (size_t i = 0; i < sizeFull; i++) {
|
|
out << *fullList.Get(i) << std::endl;
|
|
}
|
|
}
|
|
}
|
|
|
|
//std::vector< std::vector< TranslationOptionList > >::const_iterator i = coll.m_collection.begin();
|
|
//size_t j = 0;
|
|
//for (; i!=coll.m_collection.end(); ++i) {
|
|
//out << "s[" << j++ << "].size=" << i->size() << std::endl;
|
|
//}
|
|
|
|
return out;
|
|
}
|
|
|
|
void TranslationOptionCollection::CacheLexReordering()
|
|
{
|
|
size_t size = m_source.GetSize();
|
|
|
|
const std::vector<const StatefulFeatureFunction*> &ffs = StatefulFeatureFunction::GetStatefulFeatureFunctions();
|
|
std::vector<const StatefulFeatureFunction*>::const_iterator iter;
|
|
for (iter = ffs.begin(); iter != ffs.end(); ++iter) {
|
|
const StatefulFeatureFunction &ff = **iter;
|
|
if (typeid(ff) == typeid(LexicalReordering)) {
|
|
const LexicalReordering &lexreordering = static_cast<const LexicalReordering&>(ff);
|
|
for (size_t startPos = 0 ; startPos < size ; startPos++) {
|
|
size_t maxSize = size - startPos;
|
|
size_t maxSizePhrase = StaticData::Instance().GetMaxPhraseLength();
|
|
maxSize = std::min(maxSize, maxSizePhrase);
|
|
|
|
for (size_t endPos = startPos ; endPos < startPos + maxSize; endPos++) {
|
|
TranslationOptionList &transOptList = GetTranslationOptionList( startPos, endPos);
|
|
TranslationOptionList::iterator iterTransOpt;
|
|
for(iterTransOpt = transOptList.begin() ; iterTransOpt != transOptList.end() ; ++iterTransOpt) {
|
|
TranslationOption &transOpt = **iterTransOpt;
|
|
//Phrase sourcePhrase = m_source.GetSubString(WordsRange(startPos,endPos));
|
|
const Phrase &sourcePhrase = transOpt.GetInputPath().GetPhrase();
|
|
Scores score = lexreordering.GetProb(sourcePhrase
|
|
, transOpt.GetTargetPhrase());
|
|
if (!score.empty())
|
|
transOpt.CacheLexReorderingScores(lexreordering, score);
|
|
} // for(iterTransOpt
|
|
} // for (size_t endPos = startPos ; endPos < startPos + maxSize; endPos++) {
|
|
} // for (size_t startPos = 0 ; startPos < size ; startPos++) {
|
|
} // if (typeid(ff) == typeid(LexicalReordering)) {
|
|
} // for (iter = ffs.begin(); iter != ffs.end(); ++iter) {
|
|
}
|
|
|
|
//! list of trans opt for a particular span
|
|
TranslationOptionList &TranslationOptionCollection::GetTranslationOptionList(size_t startPos, size_t endPos)
|
|
{
|
|
size_t maxSize = endPos - startPos;
|
|
size_t maxSizePhrase = StaticData::Instance().GetMaxPhraseLength();
|
|
maxSize = std::min(maxSize, maxSizePhrase);
|
|
|
|
UTIL_THROW_IF2(maxSize >= m_collection[startPos].size(),
|
|
"Out of bound access: " << maxSize);
|
|
|
|
return m_collection[startPos][maxSize];
|
|
}
|
|
const TranslationOptionList &TranslationOptionCollection::GetTranslationOptionList(size_t startPos, size_t endPos) const
|
|
{
|
|
size_t maxSize = endPos - startPos;
|
|
size_t maxSizePhrase = StaticData::Instance().GetMaxPhraseLength();
|
|
maxSize = std::min(maxSize, maxSizePhrase);
|
|
|
|
UTIL_THROW_IF2(maxSize >= m_collection[startPos].size(),
|
|
"Out of bound access: " << maxSize);
|
|
return m_collection[startPos][maxSize];
|
|
}
|
|
|
|
void TranslationOptionCollection::GetTargetPhraseCollectionBatch()
|
|
{
|
|
const vector <DecodeGraph*> &decodeGraphList = StaticData::Instance().GetDecodeGraphs();
|
|
for (size_t graphInd = 0 ; graphInd < decodeGraphList.size() ; graphInd++) {
|
|
const DecodeGraph &decodeGraph = *decodeGraphList[graphInd];
|
|
|
|
list <const DecodeStep* >::const_iterator iterStep;
|
|
for (iterStep = decodeGraph.begin(); iterStep != decodeGraph.end() ; ++iterStep) {
|
|
const DecodeStep &decodeStep = **iterStep;
|
|
const DecodeStepTranslation *transStep = dynamic_cast<const DecodeStepTranslation *>(&decodeStep);
|
|
if (transStep) {
|
|
const PhraseDictionary &phraseDictionary = *transStep->GetPhraseDictionaryFeature();
|
|
phraseDictionary.GetTargetPhraseCollectionBatch(m_inputPathQueue);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace
|
|
|