C++ TargetPhraseCollection::begin方法代码示例

TargetPhraseCollection::TargetPhraseCollection(const TargetPhraseCollection &copy)
{
  for (const_iterator iter = copy.begin(); iter != copy.end(); ++iter) {
    const TargetPhrase &origTP = **iter;
    TargetPhrase *newTP = new TargetPhrase(origTP);
    Add(newTP);
  }
}

void ChartRuleCollection::Add(const TargetPhraseCollection &targetPhraseCollection
															, const WordConsumed &wordConsumed
															, bool adhereTableLimit
															, size_t ruleLimit)
{
	TargetPhraseCollection::const_iterator iter, iterEnd;
	iterEnd = (!adhereTableLimit || ruleLimit == 0 || targetPhraseCollection.GetSize() < ruleLimit)
								? targetPhraseCollection.end() : targetPhraseCollection.begin() + ruleLimit;

	for (iter = targetPhraseCollection.begin(); iter != iterEnd; ++iter)
	{
		const TargetPhrase &targetPhrase = **iter;
		float score = targetPhrase.GetFutureScore();

		if (m_collection.size() < ruleLimit)
		{ // not yet filled out quota. add everything
			m_collection.push_back(new ChartRule(targetPhrase, wordConsumed));
			m_scoreThreshold = (score < m_scoreThreshold) ? score : m_scoreThreshold;
		}
		else if (score > m_scoreThreshold)
		{ // full but not bursting. add if better than worst score
			m_collection.push_back(new ChartRule(targetPhrase, wordConsumed));
		}

		// prune if bursting
		if (m_collection.size() > ruleLimit * 2)
		{
			std::nth_element(m_collection.begin()
										, m_collection.begin() + ruleLimit
										, m_collection.end()
										, ChartRuleOrderer());
			// delete the bottom half
			for (size_t ind = ruleLimit; ind < m_collection.size(); ++ind)
			{
				// make the best score of bottom half the score threshold
				const TargetPhrase &targetPhrase = m_collection[ind]->GetTargetPhrase();
				float score = targetPhrase.GetFutureScore();
				m_scoreThreshold = (score > m_scoreThreshold) ? score : m_scoreThreshold;
				delete m_collection[ind];
			}
			m_collection.resize(ruleLimit);
		}

	}
}

ChartTranslationOptions::ChartTranslationOptions(const TargetPhraseCollection &targetPhraseColl,
    const StackVec &stackVec,
    const WordsRange &wordsRange,
    float score)
  : m_stackVec(stackVec)
  , m_wordsRange(&wordsRange)
  , m_estimateOfBestScore(score)
{
  TargetPhraseCollection::const_iterator iter;
  for (iter = targetPhraseColl.begin(); iter != targetPhraseColl.end(); ++iter) {
    const TargetPhrase *origTP = *iter;

    boost::shared_ptr<ChartTranslationOption> ptr(new ChartTranslationOption(*origTP));
    m_collection.push_back(ptr);
  }
}

float ChartTranslationOptions::CalcEstimateOfBestScore(
  const TargetPhraseCollection &tpc,
  const StackVec &stackVec)
{
  const TargetPhrase &targetPhrase = **(tpc.begin());
  float estimateOfBestScore = targetPhrase.GetFutureScore();
  for (StackVec::const_iterator p = stackVec.begin(); p != stackVec.end();
       ++p) {
    const HypoList *stack = (*p)->GetStack().cube;
    assert(stack);
    assert(!stack->empty());
    const ChartHypothesis &bestHypo = **(stack->begin());
    estimateOfBestScore += bestHypo.GetTotalScore();
  }
  return estimateOfBestScore;
}

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);
  }
}