const TargetPhraseCollection*
PhraseDictionaryCompact::GetTargetPhraseCollection(const Phrase &sourcePhrase) const {
// There is no souch source phrase if source phrase is longer than longest
// observed source phrase during compilation
if(sourcePhrase.GetSize() > m_phraseDecoder->GetMaxSourcePhraseLength())
return NULL;
// Retrieve target phrase collection from phrase table
TargetPhraseVectorPtr decodedPhraseColl
= m_phraseDecoder->CreateTargetPhraseCollection(sourcePhrase, true);
if(decodedPhraseColl != NULL && decodedPhraseColl->size()) {
TargetPhraseVectorPtr tpv(new TargetPhraseVector(*decodedPhraseColl));
TargetPhraseCollection* phraseColl = new TargetPhraseCollection();
// Score phrases and if possible apply ttable_limit
TargetPhraseVector::iterator nth =
(m_tableLimit == 0 || tpv->size() < m_tableLimit) ?
tpv->end() : tpv->begin() + m_tableLimit;
std::nth_element(tpv->begin(), nth, tpv->end(), CompareTargetPhrase());
for(TargetPhraseVector::iterator it = tpv->begin(); it != nth; it++)
phraseColl->Add(new TargetPhrase(*it));
// Cache phrase pair for for clean-up or retrieval with PREnc
const_cast<PhraseDictionaryCompact*>(this)->CacheForCleanup(sourcePhrase, phraseColl);
return phraseColl;
}
else
return NULL;
}
TargetPhraseVectorPtr PhraseDecoder::DecodeCollection(
TargetPhraseVectorPtr tpv, BitWrapper<> &encodedBitStream,
const Phrase &sourcePhrase, bool topLevel)
{
bool extending = tpv->size();
size_t bitsLeft = encodedBitStream.TellFromEnd();
typedef std::pair<size_t, size_t> AlignPointSizeT;
std::vector<int> sourceWords;
if(m_coding == REnc)
{
for(size_t i = 0; i < sourcePhrase.GetSize(); i++)
{
std::string sourceWord
= sourcePhrase.GetWord(i).GetString(*m_input, false);
unsigned idx = GetSourceSymbolId(sourceWord);
sourceWords.push_back(idx);
}
}
unsigned phraseStopSymbol = 0;
AlignPoint alignStopSymbol(-1, -1);
std::vector<float> scores;
std::set<AlignPointSizeT> alignment;
enum DecodeState { New, Symbol, Score, Alignment, Add } state = New;
size_t srcSize = sourcePhrase.GetSize();
TargetPhrase* targetPhrase = NULL;
while(encodedBitStream.TellFromEnd())
{
if(state == New)
{
// Creating new TargetPhrase on the heap
tpv->push_back(TargetPhrase(Output));
targetPhrase = &tpv->back();
targetPhrase->SetSourcePhrase(sourcePhrase);
alignment.clear();
scores.clear();
state = Symbol;
}
if(state == Symbol)
{
unsigned symbol = m_symbolTree->Read(encodedBitStream);
if(symbol == phraseStopSymbol)
{
state = Score;
}
else
{
if(m_coding == REnc)
{
std::string wordString;
size_t type = GetREncType(symbol);
if(type == 1)
{
unsigned decodedSymbol = DecodeREncSymbol1(symbol);
wordString = GetTargetSymbol(decodedSymbol);
}
else if (type == 2)
{
size_t rank = DecodeREncSymbol2Rank(symbol);
size_t srcPos = DecodeREncSymbol2Position(symbol);
if(srcPos >= sourceWords.size())
return TargetPhraseVectorPtr();
wordString = GetTargetSymbol(GetTranslation(sourceWords[srcPos], rank));
if(m_phraseDictionary.m_useAlignmentInfo)
{
size_t trgPos = targetPhrase->GetSize();
alignment.insert(AlignPoint(srcPos, trgPos));
}
}
else if(type == 3)
{
size_t rank = DecodeREncSymbol3(symbol);
size_t srcPos = targetPhrase->GetSize();
if(srcPos >= sourceWords.size())
return TargetPhraseVectorPtr();
wordString = GetTargetSymbol(GetTranslation(sourceWords[srcPos], rank));
if(m_phraseDictionary.m_useAlignmentInfo)
{
size_t trgPos = srcPos;
alignment.insert(AlignPoint(srcPos, trgPos));
}
}
Word word;
word.CreateFromString(Output, *m_output, wordString, false);
targetPhrase->AddWord(word);
}
else if(m_coding == PREnc)
{
// if the symbol is just a word
if(GetPREncType(symbol) == 1)
{
unsigned decodedSymbol = DecodePREncSymbol1(symbol);
Word word;
word.CreateFromString(Output, *m_output,
GetTargetSymbol(decodedSymbol), false);
targetPhrase->AddWord(word);
}
// if the symbol is a subphrase pointer
else
{
int left = DecodePREncSymbol2Left(symbol);
int right = DecodePREncSymbol2Right(symbol);
unsigned rank = DecodePREncSymbol2Rank(symbol);
int srcStart = left + targetPhrase->GetSize();
int srcEnd = srcSize - right - 1;
// false positive consistency check
if(0 > srcStart || srcStart > srcEnd || unsigned(srcEnd) >= srcSize)
return TargetPhraseVectorPtr();
// false positive consistency check
if(m_maxRank && rank > m_maxRank)
return TargetPhraseVectorPtr();
// set subphrase by default to itself
TargetPhraseVectorPtr subTpv = tpv;
// if range smaller than source phrase retrieve subphrase
if(unsigned(srcEnd - srcStart + 1) != srcSize)
{
Phrase subPhrase = sourcePhrase.GetSubString(WordsRange(srcStart, srcEnd));
subTpv = CreateTargetPhraseCollection(subPhrase, false);
}
// false positive consistency check
if(subTpv != NULL && rank < subTpv->size())
{
// insert the subphrase into the main target phrase
TargetPhrase& subTp = subTpv->at(rank);
if(m_phraseDictionary.m_useAlignmentInfo)
{
// reconstruct the alignment data based on the alignment of the subphrase
for(AlignmentInfo::const_iterator it = subTp.GetAlignmentInfo().begin();
it != subTp.GetAlignmentInfo().end(); it++)
{
alignment.insert(AlignPointSizeT(srcStart + it->first,
targetPhrase->GetSize() + it->second));
}
}
targetPhrase->Append(subTp);
}
else
return TargetPhraseVectorPtr();
}
}
else
{
Word word;
word.CreateFromString(Output, *m_output,
GetTargetSymbol(symbol), false);
targetPhrase->AddWord(word);
}
}
}
else if(state == Score)
{
size_t idx = m_multipleScoreTrees ? scores.size() : 0;
float score = m_scoreTrees[idx]->Read(encodedBitStream);
scores.push_back(score);
if(scores.size() == m_numScoreComponent)
{
targetPhrase->SetScore(m_feature, scores, ScoreComponentCollection() /*sparse*/,*m_weight, m_weightWP, *m_languageModels);
if(m_containsAlignmentInfo)
state = Alignment;
else
state = Add;
}
}
else if(state == Alignment)
{
AlignPoint alignPoint = m_alignTree->Read(encodedBitStream);
if(alignPoint == alignStopSymbol)
{
state = Add;
}
else
{
if(m_phraseDictionary.m_useAlignmentInfo)
alignment.insert(AlignPointSizeT(alignPoint));
}
}
if(state == Add)
{
if(m_phraseDictionary.m_useAlignmentInfo)
targetPhrase->SetAlignmentInfo(alignment);
if(m_coding == PREnc)
{
if(!m_maxRank || tpv->size() <= m_maxRank)
bitsLeft = encodedBitStream.TellFromEnd();
if(!topLevel && m_maxRank && tpv->size() >= m_maxRank)
break;
}
if(encodedBitStream.TellFromEnd() <= 8)
break;
state = New;
}
}
if(m_coding == PREnc && !extending)
{
bitsLeft = bitsLeft > 8 ? bitsLeft : 0;
m_decodingCache.Cache(sourcePhrase, tpv, bitsLeft, m_maxRank);
}
return tpv;
}
int main(int argc, char **argv)
{
int nscores = 5;
std::string ttable = "";
bool useAlignments = false;
bool reportCounts = false;
for(int i = 1; i < argc; i++) {
if(!strcmp(argv[i], "-n")) {
if(i + 1 == argc)
usage();
nscores = atoi(argv[++i]);
} else if(!strcmp(argv[i], "-t")) {
if(i + 1 == argc)
usage();
ttable = argv[++i];
} else if(!strcmp(argv[i], "-a")) {
useAlignments = true;
} else if (!strcmp(argv[i], "-c")) {
reportCounts = true;
}
else
usage();
}
if(ttable == "")
usage();
std::vector<FactorType> input(1, 0);
std::vector<FactorType> output(1, 0);
std::vector<float> weight(nscores, 0);
LMList lmList;
Parameter *parameter = new Parameter();
const_cast<std::vector<std::string>&>(parameter->GetParam("factor-delimiter")).resize(1, "||dummy_string||");
const_cast<std::vector<std::string>&>(parameter->GetParam("input-factors")).resize(1, "0");
const_cast<std::vector<std::string>&>(parameter->GetParam("verbose")).resize(1, "0");
const_cast<std::vector<std::string>&>(parameter->GetParam("weight-w")).resize(1, "0");
const_cast<std::vector<std::string>&>(parameter->GetParam("weight-d")).resize(1, "0");
StaticData::InstanceNonConst().LoadData(parameter);
SparsePhraseDictionaryFeature *spdf = NULL;
PhraseDictionaryFeature pdf(Compact, spdf, nscores, nscores, input, output, ttable, weight, 0, 0, "", "");
PhraseDictionaryCompact pdc(nscores, Compact, &pdf, false, useAlignments);
bool ret = pdc.Load(input, output, ttable, weight, 0, lmList, 0);
assert(ret);
std::string line;
while(getline(std::cin, line)) {
Phrase sourcePhrase;
sourcePhrase.CreateFromString(input, line, "||dummy_string||");
TargetPhraseVectorPtr decodedPhraseColl
= pdc.GetTargetPhraseCollectionRaw(sourcePhrase);
if(decodedPhraseColl != NULL) {
if(reportCounts)
std::cout << sourcePhrase << decodedPhraseColl->size() << std::endl;
else
for(TargetPhraseVector::iterator it = decodedPhraseColl->begin(); it != decodedPhraseColl->end(); it++) {
TargetPhrase &tp = *it;
std::cout << sourcePhrase << "||| ";
std::cout << static_cast<const Phrase&>(tp) << "|||";
if(useAlignments)
std::cout << " " << tp.GetAlignTerm() << "|||";
std::vector<float> scores = tp.GetScoreBreakdown().GetScoresForProducer(&pdf);
for(size_t i = 0; i < scores.size(); i++)
std::cout << " " << exp(scores[i]);
std::cout << std::endl;
}
}
else if(reportCounts)
std::cout << sourcePhrase << 0 << std::endl;
std::cout.flush();
}
}
