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vw corner cases when looking inside factors

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Ales Tamchyna 2016-04-04 16:32:39 +02:00
parent 90f6f4d4a7
commit 2a58011d37
1 changed files with 6 additions and 0 deletions
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6
moses/FF/VW/VWFeatureContext.h
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@ -71,6 +71,12 @@ protected:
if (m_targetFactors.size() != 1)
UTIL_THROW2("You can only use factor-positions when a single target-side factor is defined.");
const std::string &fullFactor = word.GetFactor(m_targetFactors[0])->GetString().as_string();
// corner cases: at sentence beginning/end, we don't have the correct factors set up
// similarly for UNK
if (fullFactor == BOS_ || fullFactor == EOS_ || fullFactor == UNKNOWN_FACTOR)
return fullFactor;
std::string subFactor(m_factorPositions.size(), 'x'); // initialize string with correct size and placeholder chars
for (size_t i = 0; i < m_factorPositions.size(); i++)
subFactor[i] = fullFactor[m_factorPositions[i]];