template <class Model> void Fill<Model>::Add(const TargetPhraseCollection &targets, const StackVec &nts, const WordsRange &)
{
std::vector<search::PartialVertex> vertices;
vertices.reserve(nts.size());
float below_score = 0.0;
for (StackVec::const_iterator i(nts.begin()); i != nts.end(); ++i) {
vertices.push_back((*i)->GetStack().incr->RootAlternate());
if (vertices.back().Empty()) return;
below_score += vertices.back().Bound();
}
std::vector<lm::WordIndex> words;
for (TargetPhraseCollection::const_iterator p(targets.begin()); p != targets.end(); ++p) {
words.clear();
const TargetPhrase &phrase = **p;
const AlignmentInfo::NonTermIndexMap &align = phrase.GetAlignNonTerm().GetNonTermIndexMap();
search::PartialEdge edge(edges_.AllocateEdge(nts.size()));
search::PartialVertex *nt = edge.NT();
for (size_t i = 0; i < phrase.GetSize(); ++i) {
const Word &word = phrase.GetWord(i);
if (word.IsNonTerminal()) {
*(nt++) = vertices[align[i]];
words.push_back(search::kNonTerminal);
} else {
words.push_back(Convert(word));
}
}
edge.SetScore(phrase.GetFutureScore() + below_score);
// prob and oov were already accounted for.
search::ScoreRule(context_.LanguageModel(), words, edge.Between());
search::Note note;
note.vp = &phrase;
edge.SetNote(note);
edges_.AddEdge(edge);
}
}
void ChartTranslationOptionList::Add(const TargetPhraseCollection &tpc,
const StackVec &stackVec,
const WordsRange &range)
{
if (tpc.IsEmpty()) {
return;
}
for (size_t i = 0; i < stackVec.size(); ++i) {
const ChartCellLabel &chartCellLabel = *stackVec[i];
size_t numHypos = chartCellLabel.GetStack().cube->size();
if (numHypos == 0) {
return; // empty stack. These rules can't be used
}
}
float score = ChartTranslationOptions::CalcEstimateOfBestScore(tpc, stackVec);
// If the rule limit has already been reached then don't add the option
// unless it is better than at least one existing option.
if (m_size > m_ruleLimit && score < m_scoreThreshold) {
return;
}
// Add the option to the list.
if (m_size == m_collection.size()) {
// m_collection has reached capacity: create a new object.
m_collection.push_back(new ChartTranslationOptions(tpc, stackVec,
range, score));
} else {
// Overwrite an unused object.
*(m_collection[m_size]) = ChartTranslationOptions(tpc, stackVec,
range, score);
}
++m_size;
// If the rule limit hasn't been exceeded then update the threshold.
if (m_size <= m_ruleLimit) {
m_scoreThreshold = (score < m_scoreThreshold) ? score : m_scoreThreshold;
}
// Prune if bursting
if (m_size == m_ruleLimit * 2) {
NTH_ELEMENT4(m_collection.begin(),
m_collection.begin() + m_ruleLimit - 1,
m_collection.begin() + m_size,
ChartTranslationOptionOrderer());
m_scoreThreshold = m_collection[m_ruleLimit-1]->GetEstimateOfBestScore();
m_size = m_ruleLimit;
}
}
