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am b074dfea: Merge "Add a comment on a caveat for future reference." into jb-dev

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* commit 'b074dfead504fba4039e4eaaded07c10244ff292':
  Add a comment on a caveat for future reference.
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Jean Chalard 2012-05-29 00:59:14 -07:00 committed by Android Git Automerger
commit e3864d429e
1 changed files with 5 additions and 0 deletions
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native/jni/src/bigram_dictionary.cpp
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@ -126,6 +126,11 @@ int BigramDictionary::getBigrams(const int32_t *prevWord, int prevWordLength, in
// codesSize == 0 means we are trying to find bigram predictions. // codesSize == 0 means we are trying to find bigram predictions.
if (codesSize < 1 || checkFirstCharacter(bigramBuffer)) { if (codesSize < 1 || checkFirstCharacter(bigramBuffer)) {
const int bigramFreq = UnigramDictionary::MASK_ATTRIBUTE_FREQUENCY & bigramFlags; const int bigramFreq = UnigramDictionary::MASK_ATTRIBUTE_FREQUENCY & bigramFlags;
// Due to space constraints, the frequency for bigrams is approximate - the lower the
// unigram frequency, the worse the precision. The theoritical maximum error in
// resulting frequency is 8 - although in the practice it's never bigger than 3 or 4
// in very bad cases. This means that sometimes, we'll see some bigrams interverted
// here, but it can't get too bad.
const int frequency = const int frequency =
BinaryFormat::computeFrequencyForBigram(unigramFreq, bigramFreq); BinaryFormat::computeFrequencyForBigram(unigramFreq, bigramFreq);
if (addWordBigram(bigramBuffer, length, frequency)) { if (addWordBigram(bigramBuffer, length, frequency)) {