public TranslationResult Merge(int prefixCount, double threshold, TranslationResult otherResult)
{
var mergedTargetSegment = new List <string>();
var mergedConfidences = new List <double>();
var mergedSources = new List <TranslationSources>();
var mergedAlignment = new HashSet <Tuple <int, int> >();
for (int j = 0; j < TargetSegment.Count; j++)
{
int[] sourceIndices = Alignment.GetColumnAlignedIndices(j).ToArray();
if (sourceIndices.Length == 0)
{
// target word doesn't align with anything
mergedTargetSegment.Add(TargetSegment[j]);
mergedConfidences.Add(WordConfidences[j]);
mergedSources.Add(WordSources[j]);
}
else
{
// target word aligns with some source words
if (j < prefixCount || WordConfidences[j] >= threshold)
{
// use target word of this result
mergedTargetSegment.Add(TargetSegment[j]);
mergedConfidences.Add(WordConfidences[j]);
TranslationSources sources = WordSources[j];
foreach (int i in sourceIndices)
{
// combine sources for any words that both this result
// and the other result translated the same
foreach (int jOther in otherResult.Alignment.GetRowAlignedIndices(i))
{
TranslationSources otherSources = otherResult.WordSources[jOther];
if (otherSources != TranslationSources.None &&
otherResult.TargetSegment[jOther] == TargetSegment[j])
{
sources |= otherSources;
}
}
mergedAlignment.Add(Tuple.Create(i, mergedTargetSegment.Count - 1));
}
mergedSources.Add(sources);
}
else
{
// use target words of other result
bool found = false;
foreach (int i in sourceIndices)
{
foreach (int jOther in otherResult.Alignment.GetRowAlignedIndices(i))
{
// look for any translated words from other result
TranslationSources otherSources = otherResult.WordSources[jOther];
if (otherSources != TranslationSources.None)
{
mergedTargetSegment.Add(otherResult.TargetSegment[jOther]);
mergedConfidences.Add(otherResult.WordConfidences[jOther]);
mergedSources.Add(otherSources);
mergedAlignment.Add(Tuple.Create(i, mergedTargetSegment.Count - 1));
found = true;
}
}
}
if (!found)
{
// the other result had no translated words, so just use this result's target word
mergedTargetSegment.Add(TargetSegment[j]);
mergedConfidences.Add(WordConfidences[j]);
mergedSources.Add(WordSources[j]);
foreach (int i in sourceIndices)
{
mergedAlignment.Add(Tuple.Create(i, mergedTargetSegment.Count - 1));
}
}
}
}
}
var alignment = new WordAlignmentMatrix(SourceSegment.Count, mergedTargetSegment.Count);
foreach (Tuple <int, int> t in mergedAlignment)
{
alignment[t.Item1, t.Item2] = true;
}
return(new TranslationResult(SourceSegment, mergedTargetSegment, mergedConfidences, mergedSources,
alignment, Phrases));
}