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Update useless n-gram entry detection logic during GC.

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Bug: 14425059
Change-Id: Ib939deae5b60167751dee07965bb1ef1a43c4625
This commit is contained in:
Keisuke Kuroyanagi 2014-10-15 20:43:27 +09:00
parent 72d17d9209
commit 3601c214f8
3 changed files with 92 additions and 22 deletions
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45
native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content.cpp
View File

@ -270,16 +270,26 @@ int LanguageModelDictContent::getBitmapEntryIndex(const WordIdArrayView prevWord
}
bool LanguageModelDictContent::updateAllProbabilityEntriesForGCInner(const int bitmapEntryIndex,
const int level, const HeaderPolicy *const headerPolicy, int *const outEntryCounts) {
const int prevWordCount, const HeaderPolicy *const headerPolicy,
int *const outEntryCounts) {
for (const auto &entry : mTrieMap.getEntriesInSpecifiedLevel(bitmapEntryIndex)) {
if (level > MAX_PREV_WORD_COUNT_FOR_N_GRAM) {
AKLOGE("Invalid level. level: %d, MAX_PREV_WORD_COUNT_FOR_N_GRAM: %d.",
level, MAX_PREV_WORD_COUNT_FOR_N_GRAM);
if (prevWordCount > MAX_PREV_WORD_COUNT_FOR_N_GRAM) {
AKLOGE("Invalid prevWordCount. prevWordCount: %d, MAX_PREV_WORD_COUNT_FOR_N_GRAM: %d.",
prevWordCount, MAX_PREV_WORD_COUNT_FOR_N_GRAM);
return false;
}
const ProbabilityEntry probabilityEntry =
ProbabilityEntry::decode(entry.value(), mHasHistoricalInfo);
if (mHasHistoricalInfo && !probabilityEntry.representsBeginningOfSentence()) {
if (prevWordCount > 0 && probabilityEntry.isValid()
&& !mTrieMap.getRoot(entry.key()).mIsValid) {
// The entry is related to a word that has been removed. Remove the entry.
if (!mTrieMap.remove(entry.key(), bitmapEntryIndex)) {
return false;
}
continue;
}
if (mHasHistoricalInfo && !probabilityEntry.representsBeginningOfSentence()
&& probabilityEntry.isValid()) {
const HistoricalInfo historicalInfo = ForgettingCurveUtils::createHistoricalInfoToSave(
probabilityEntry.getHistoricalInfo(), headerPolicy);
if (ForgettingCurveUtils::needsToKeep(&historicalInfo, headerPolicy)) {
@ -298,13 +308,13 @@ bool LanguageModelDictContent::updateAllProbabilityEntriesForGCInner(const int b
}
}
if (!probabilityEntry.representsBeginningOfSentence()) {
outEntryCounts[level] += 1;
outEntryCounts[prevWordCount] += 1;
}
if (!entry.hasNextLevelMap()) {
continue;
}
if (!updateAllProbabilityEntriesForGCInner(entry.getNextLevelBitmapEntryIndex(), level + 1,
headerPolicy, outEntryCounts)) {
if (!updateAllProbabilityEntriesForGCInner(entry.getNextLevelBitmapEntryIndex(),
prevWordCount + 1, headerPolicy, outEntryCounts)) {
return false;
}
}
@ -332,7 +342,7 @@ bool LanguageModelDictContent::turncateEntriesInSpecifiedLevel(
for (int i = 0; i < entryCountToRemove; ++i) {
const EntryInfoToTurncate &entryInfo = entryInfoVector[i];
if (!removeNgramProbabilityEntry(
WordIdArrayView(entryInfo.mPrevWordIds, entryInfo.mEntryLevel), entryInfo.mKey)) {
WordIdArrayView(entryInfo.mPrevWordIds, entryInfo.mPrevWordCount), entryInfo.mKey)) {
return false;
}
}
@ -342,9 +352,9 @@ bool LanguageModelDictContent::turncateEntriesInSpecifiedLevel(
bool LanguageModelDictContent::getEntryInfo(const HeaderPolicy *const headerPolicy,
const int targetLevel, const int bitmapEntryIndex, std::vector<int> *const prevWordIds,
std::vector<EntryInfoToTurncate> *const outEntryInfo) const {
const int currentLevel = prevWordIds->size();
const int prevWordCount = prevWordIds->size();
for (const auto &entry : mTrieMap.getEntriesInSpecifiedLevel(bitmapEntryIndex)) {
if (currentLevel < targetLevel) {
if (prevWordCount < targetLevel) {
if (!entry.hasNextLevelMap()) {
continue;
}
@ -379,10 +389,10 @@ bool LanguageModelDictContent::EntryInfoToTurncate::Comparator::operator()(
if (left.mKey != right.mKey) {
return left.mKey < right.mKey;
}
if (left.mEntryLevel != right.mEntryLevel) {
return left.mEntryLevel > right.mEntryLevel;
if (left.mPrevWordCount != right.mPrevWordCount) {
return left.mPrevWordCount > right.mPrevWordCount;
}
for (int i = 0; i < left.mEntryLevel; ++i) {
for (int i = 0; i < left.mPrevWordCount; ++i) {
if (left.mPrevWordIds[i] != right.mPrevWordIds[i]) {
return left.mPrevWordIds[i] < right.mPrevWordIds[i];
}
@ -392,9 +402,10 @@ bool LanguageModelDictContent::EntryInfoToTurncate::Comparator::operator()(
}
LanguageModelDictContent::EntryInfoToTurncate::EntryInfoToTurncate(const int probability,
const int timestamp, const int key, const int entryLevel, const int *const prevWordIds)
: mProbability(probability), mTimestamp(timestamp), mKey(key), mEntryLevel(entryLevel) {
memmove(mPrevWordIds, prevWordIds, mEntryLevel * sizeof(mPrevWordIds[0]));
const int timestamp, const int key, const int prevWordCount, const int *const prevWordIds)
: mProbability(probability), mTimestamp(timestamp), mKey(key),
mPrevWordCount(prevWordCount) {
memmove(mPrevWordIds, prevWordIds, mPrevWordCount * sizeof(mPrevWordIds[0]));
}
} // namespace latinime

8
native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content.h
View File

@ -160,7 +160,7 @@ class LanguageModelDictContent {
outEntryCounts[i] = 0;
}
return updateAllProbabilityEntriesForGCInner(mTrieMap.getRootBitmapEntryIndex(),
0 /* level */, headerPolicy, outEntryCounts);
0 /* prevWordCount */, headerPolicy, outEntryCounts);
}
// entryCounts should be created by updateAllProbabilityEntries.
@ -185,12 +185,12 @@ class LanguageModelDictContent {
};
EntryInfoToTurncate(const int probability, const int timestamp, const int key,
const int entryLevel, const int *const prevWordIds);
const int prevWordCount, const int *const prevWordIds);
int mProbability;
int mTimestamp;
int mKey;
int mEntryLevel;
int mPrevWordCount;
int mPrevWordIds[MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1];
private:
@ -208,7 +208,7 @@ class LanguageModelDictContent {
int *const outNgramCount);
int createAndGetBitmapEntryIndex(const WordIdArrayView prevWordIds);
int getBitmapEntryIndex(const WordIdArrayView prevWordIds) const;
bool updateAllProbabilityEntriesForGCInner(const int bitmapEntryIndex, const int level,
bool updateAllProbabilityEntriesForGCInner(const int bitmapEntryIndex, const int prevWordCount,
const HeaderPolicy *const headerPolicy, int *const outEntryCounts);
bool turncateEntriesInSpecifiedLevel(const HeaderPolicy *const headerPolicy,
const int maxEntryCount, const int targetLevel, int *const outEntryCount);

61
tests/src/com/android/inputmethod/latin/BinaryDictionaryDecayingTests.java
View File

@ -75,6 +75,10 @@ public class BinaryDictionaryDecayingTests extends AndroidTestCase {
return formatVersion > FormatSpec.VERSION401;
}
private static boolean supportsNgram(final int formatVersion) {
return formatVersion >= FormatSpec.VERSION4_DEV;
}
private void onInputWord(final BinaryDictionary binaryDictionary, final String word,
final boolean isValidWord) {
binaryDictionary.updateEntriesForWordWithNgramContext(NgramContext.EMPTY_PREV_WORDS_INFO,
@ -88,6 +92,14 @@ public class BinaryDictionaryDecayingTests extends AndroidTestCase {
mCurrentTime /* timestamp */);
}
private void onInputWordWithPrevWords(final BinaryDictionary binaryDictionary,
final String word, final boolean isValidWord, final String prevWord,
final String prevPrevWord) {
binaryDictionary.updateEntriesForWordWithNgramContext(
new NgramContext(new WordInfo(prevWord), new WordInfo(prevPrevWord)), word,
isValidWord, 1 /* count */, mCurrentTime /* timestamp */);
}
private void onInputWordWithBeginningOfSentenceContext(
final BinaryDictionary binaryDictionary, final String word, final boolean isValidWord) {
binaryDictionary.updateEntriesForWordWithNgramContext(NgramContext.BEGINNING_OF_SENTENCE,
@ -99,6 +111,12 @@ public class BinaryDictionaryDecayingTests extends AndroidTestCase {
return binaryDictionary.isValidNgram(new NgramContext(new WordInfo(word0)), word1);
}
private static boolean isValidTrigram(final BinaryDictionary binaryDictionary,
final String word0, final String word1, final String word2) {
return binaryDictionary.isValidNgram(
new NgramContext(new WordInfo(word1), new WordInfo(word0)), word2);
}
private void forcePassingShortTime(final BinaryDictionary binaryDictionary) {
// 30 days.
final int timeToElapse = (int)TimeUnit.SECONDS.convert(30, TimeUnit.DAYS);
@ -256,7 +274,23 @@ public class BinaryDictionaryDecayingTests extends AndroidTestCase {
onInputWordWithPrevWord(binaryDictionary, "y", true /* isValidWord */, "x");
assertFalse(isValidBigram(binaryDictionary, "x", "y"));
binaryDictionary.close();
if (!supportsNgram(formatVersion)) {
return;
}
onInputWordWithPrevWords(binaryDictionary, "c", false /* isValidWord */, "b", "a");
assertFalse(isValidTrigram(binaryDictionary, "a", "b", "c"));
assertFalse(isValidBigram(binaryDictionary, "b", "c"));
onInputWordWithPrevWords(binaryDictionary, "c", false /* isValidWord */, "b", "a");
assertTrue(isValidTrigram(binaryDictionary, "a", "b", "c"));
assertTrue(isValidBigram(binaryDictionary, "b", "c"));
onInputWordWithPrevWords(binaryDictionary, "d", true /* isValidWord */, "b", "a");
assertTrue(isValidTrigram(binaryDictionary, "a", "b", "d"));
assertTrue(isValidBigram(binaryDictionary, "b", "d"));
onInputWordWithPrevWords(binaryDictionary, "cd", true /* isValidWord */, "b", "a");
assertTrue(isValidTrigram(binaryDictionary, "a", "b", "cd"));
}
public void testDecayingProbability() {
@ -301,6 +335,31 @@ public class BinaryDictionaryDecayingTests extends AndroidTestCase {
forcePassingLongTime(binaryDictionary);
assertFalse(isValidBigram(binaryDictionary, "a", "b"));
if (!supportsNgram(formatVersion)) {
return;
}
onInputWord(binaryDictionary, "ab", true /* isValidWord */);
onInputWordWithPrevWord(binaryDictionary, "bc", true /* isValidWord */, "ab");
onInputWordWithPrevWords(binaryDictionary, "cd", true /* isValidWord */, "bc", "ab");
assertTrue(isValidTrigram(binaryDictionary, "ab", "bc", "cd"));
forcePassingShortTime(binaryDictionary);
assertFalse(isValidTrigram(binaryDictionary, "ab", "bc", "cd"));
onInputWord(binaryDictionary, "ab", true /* isValidWord */);
onInputWordWithPrevWord(binaryDictionary, "bc", true /* isValidWord */, "ab");
onInputWordWithPrevWords(binaryDictionary, "cd", true /* isValidWord */, "bc", "ab");
onInputWord(binaryDictionary, "ab", true /* isValidWord */);
onInputWordWithPrevWord(binaryDictionary, "bc", true /* isValidWord */, "ab");
onInputWordWithPrevWords(binaryDictionary, "cd", true /* isValidWord */, "bc", "ab");
onInputWord(binaryDictionary, "ab", true /* isValidWord */);
onInputWordWithPrevWord(binaryDictionary, "bc", true /* isValidWord */, "ab");
onInputWordWithPrevWords(binaryDictionary, "cd", true /* isValidWord */, "bc", "ab");
forcePassingShortTime(binaryDictionary);
assertTrue(isValidTrigram(binaryDictionary, "ab", "bc", "cd"));
forcePassingLongTime(binaryDictionary);
assertFalse(isValidTrigram(binaryDictionary, "ab", "bc", "cd"));
binaryDictionary.close();
}