本文整理汇总了C++中WordsBitmap::GetNumWordsCovered方法的典型用法代码示例。如果您正苦于以下问题：C++ WordsBitmap::GetNumWordsCovered方法的具体用法？C++ WordsBitmap::GetNumWordsCovered怎么用？C++ WordsBitmap::GetNumWordsCovered使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类WordsBitmap的用法示例。
在下文中一共展示了WordsBitmap::GetNumWordsCovered方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: Evaluate
/*
* Given a previous state, compute Bleu score for the updated state with an additional target
* phrase translated.
*/
FFState* BleuScoreFeature::Evaluate(const Hypothesis& cur_hypo,
const FFState* prev_state,
ScoreComponentCollection* accumulator) const
{
if (!m_enabled) return new BleuScoreState();
NGrams::const_iterator reference_ngrams_iter;
const BleuScoreState& ps = dynamic_cast<const BleuScoreState&>(*prev_state);
BleuScoreState* new_state = new BleuScoreState(ps);
float old_bleu, new_bleu;
size_t num_new_words, ctx_start_idx, ctx_end_idx;
// Calculate old bleu;
old_bleu = CalculateBleu(new_state);
// Get context and append new words.
num_new_words = cur_hypo.GetCurrTargetLength();
if (num_new_words == 0) {
return new_state;
}
Phrase new_words = ps.m_words;
new_words.Append(cur_hypo.GetCurrTargetPhrase());
//cerr << "NW: " << new_words << endl;
// get ngram matches for new words
GetNgramMatchCounts(new_words,
m_cur_ref_ngrams,
new_state->m_ngram_counts,
new_state->m_ngram_matches,
new_state->m_words.GetSize()); // number of words in previous states
// Update state variables
ctx_end_idx = new_words.GetSize()-1;
size_t bleu_context_length = BleuScoreState::bleu_order -1;
if (ctx_end_idx > bleu_context_length) {
ctx_start_idx = ctx_end_idx - bleu_context_length;
} else {
ctx_start_idx = 0;
}
WordsBitmap coverageVector = cur_hypo.GetWordsBitmap();
new_state->m_source_length = coverageVector.GetNumWordsCovered();
new_state->m_words = new_words.GetSubString(WordsRange(ctx_start_idx,
ctx_end_idx));
new_state->m_target_length += cur_hypo.GetCurrTargetLength();
// we need a scaled reference length to compare the current target phrase to the corresponding reference phrase
new_state->m_scaled_ref_length = m_cur_ref_length *
((float)coverageVector.GetNumWordsCovered()/coverageVector.GetSize());
// Calculate new bleu.
new_bleu = CalculateBleu(new_state);
// Set score to new Bleu score
accumulator->PlusEquals(this, new_bleu - old_bleu);
return new_state;
}