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Refactor proximity info state 

Change-Id: I00e0618d95d20e5bf5c9e6481e4d3037723785f7
main
Satoshi Kataoka 2013-01-23 16:47:17 +09:00
parent f1074c508e
commit e5aad56463
4 changed files with 60 additions and 62 deletions
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23
native/jni/src/proximity_info_state.cpp
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@ -71,9 +71,9 @@ void ProximityInfoState::initInputParams(const int pointerId, const float maxPoi
mSampledTimes.clear();
mSampledInputIndice.clear();
mSampledLengthCache.clear();
mDistanceCache_G.clear();
mNearKeysVector.clear();
mSearchKeysVector.clear();
mSampledDistanceCache_G.clear();
mSampledNearKeysVector.clear();
mSampledSearchKeysVector.clear();
mSpeedRates.clear();
mBeelineSpeedPercentiles.clear();
mCharProbabilities.clear();
@ -108,16 +108,17 @@ void ProximityInfoState::initInputParams(const int pointerId, const float maxPoi
ProximityInfoStateUtils::initGeometricDistanceInfos(
mProximityInfo, mProximityInfo->getKeyCount(),
mSampledInputSize, lastSavedInputSize, &mSampledInputXs, &mSampledInputYs,
&mNearKeysVector, &mSearchKeysVector, &mDistanceCache_G);
&mSampledNearKeysVector, &mSampledDistanceCache_G);
if (isGeometric) {
// updates probabilities of skipping or mapping each key for all points.
ProximityInfoStateUtils::updateAlignPointProbabilities(
mMaxPointToKeyLength, mProximityInfo->getMostCommonKeyWidth(),
mProximityInfo->getKeyCount(), lastSavedInputSize, mSampledInputSize,
&mSampledInputXs, &mSampledInputYs, &mSpeedRates, &mSampledLengthCache,
&mDistanceCache_G, &mNearKeysVector, &mCharProbabilities);
ProximityInfoStateUtils::updateSearchKeysVector(mProximityInfo, mSampledInputSize,
lastSavedInputSize, &mSampledLengthCache, &mNearKeysVector, &mSearchKeysVector);
&mSampledDistanceCache_G, &mSampledNearKeysVector, &mCharProbabilities);
ProximityInfoStateUtils::updateSampledSearchKeysVector(mProximityInfo,
mSampledInputSize, lastSavedInputSize, &mSampledLengthCache,
&mSampledNearKeysVector, &mSampledSearchKeysVector);
}
}
@ -189,7 +190,7 @@ float ProximityInfoState::getPointToKeyLength(
const int keyId = mProximityInfo->getKeyIndexOf(codePoint);
if (keyId != NOT_AN_INDEX) {
const int index = inputIndex * mProximityInfo->getKeyCount() + keyId;
return min(mDistanceCache_G[index] * scale, mMaxPointToKeyLength);
return min(mSampledDistanceCache_G[index] * scale, mMaxPointToKeyLength);
}
if (isSkippableCodePoint(codePoint)) {
return 0.0f;
@ -206,7 +207,7 @@ float ProximityInfoState::getPointToKeyLength_G(const int inputIndex, const int
float ProximityInfoState::getPointToKeyByIdLength(
const int inputIndex, const int keyId, const float scale) const {
return ProximityInfoStateUtils::getPointToKeyByIdLength(mMaxPointToKeyLength,
&mDistanceCache_G, mProximityInfo->getKeyCount(), inputIndex, keyId, scale);
&mSampledDistanceCache_G, mProximityInfo->getKeyCount(), inputIndex, keyId, scale);
}
float ProximityInfoState::getPointToKeyByIdLength(const int inputIndex, const int keyId) const {
@ -289,7 +290,7 @@ int ProximityInfoState::getAllPossibleChars(
int newFilterSize = filterSize;
const int keyCount = mProximityInfo->getKeyCount();
for (int j = 0; j < keyCount; ++j) {
if (mSearchKeysVector[index].test(j)) {
if (mSampledSearchKeysVector[index].test(j)) {
const int keyCodePoint = mProximityInfo->getCodePointOf(j);
bool insert = true;
// TODO: Avoid linear search
@ -310,7 +311,7 @@ int ProximityInfoState::getAllPossibleChars(
bool ProximityInfoState::isKeyInSerchKeysAfterIndex(const int index, const int keyId) const {
ASSERT(keyId >= 0);
ASSERT(index >= 0 && index < mSampledInputSize);
return mSearchKeysVector[index].test(keyId);
return mSampledSearchKeysVector[index].test(keyId);
}
void ProximityInfoState::popInputData() {

14
native/jni/src/proximity_info_state.h
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@ -52,9 +52,9 @@ class ProximityInfoState {
mKeyCount(0), mCellHeight(0), mCellWidth(0), mGridHeight(0), mGridWidth(0),
mIsContinuationPossible(false), mSampledInputXs(), mSampledInputYs(), mSampledTimes(),
mSampledInputIndice(), mSampledLengthCache(), mBeelineSpeedPercentiles(),
mDistanceCache_G(), mSpeedRates(), mDirections(), mCharProbabilities(),
mNearKeysVector(), mSearchKeysVector(), mTouchPositionCorrectionEnabled(false),
mSampledInputSize(0) {
mSampledDistanceCache_G(), mSpeedRates(), mDirections(), mCharProbabilities(),
mSampledNearKeysVector(), mSampledSearchKeysVector(),
mTouchPositionCorrectionEnabled(false), mSampledInputSize(0) {
memset(mInputProximities, 0, sizeof(mInputProximities));
memset(mNormalizedSquaredDistances, 0, sizeof(mNormalizedSquaredDistances));
memset(mPrimaryInputWord, 0, sizeof(mPrimaryInputWord));
@ -240,20 +240,20 @@ class ProximityInfoState {
std::vector<int> mSampledInputIndice;
std::vector<int> mSampledLengthCache;
std::vector<int> mBeelineSpeedPercentiles;
std::vector<float> mDistanceCache_G;
std::vector<float> mSampledDistanceCache_G;
std::vector<float> mSpeedRates;
std::vector<float> mDirections;
// probabilities of skipping or mapping to a key for each point.
std::vector<hash_map_compat<int, float> > mCharProbabilities;
// The vector for the key code set which holds nearby keys for each sampled input point
// 1. Used to calculate the probability of the key
// 2. Used to calculate mSearchKeysVector
std::vector<ProximityInfoStateUtils::NearKeycodesSet> mNearKeysVector;
// 2. Used to calculate mSampledSearchKeysVector
std::vector<ProximityInfoStateUtils::NearKeycodesSet> mSampledNearKeysVector;
// The vector for the key code set which holds nearby keys of some trailing sampled input points
// for each sampled input point. These nearby keys contain the next characters which can be in
// the dictionary. Specifically, currently we are looking for keys nearby trailing sampled
// inputs including the current input point.
std::vector<ProximityInfoStateUtils::NearKeycodesSet> mSearchKeysVector;
std::vector<ProximityInfoStateUtils::NearKeycodesSet> mSampledSearchKeysVector;
bool mTouchPositionCorrectionEnabled;
int mInputProximities[MAX_PROXIMITY_CHARS_SIZE * MAX_WORD_LENGTH];
int mNormalizedSquaredDistances[MAX_PROXIMITY_CHARS_SIZE * MAX_WORD_LENGTH];

66
native/jni/src/proximity_info_state_utils.cpp
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@ -215,15 +215,12 @@ namespace latinime {
const int sampledInputSize, const int lastSavedInputSize,
const std::vector<int> *const sampledInputXs,
const std::vector<int> *const sampledInputYs,
std::vector<NearKeycodesSet> *nearKeysVector,
std::vector<NearKeycodesSet> *searchKeysVector,
std::vector<float> *distanceCache_G) {
nearKeysVector->resize(sampledInputSize);
searchKeysVector->resize(sampledInputSize);
distanceCache_G->resize(sampledInputSize * keyCount);
std::vector<NearKeycodesSet> *SampledNearKeysVector,
std::vector<float> *SampledDistanceCache_G) {
SampledNearKeysVector->resize(sampledInputSize);
SampledDistanceCache_G->resize(sampledInputSize * keyCount);
for (int i = lastSavedInputSize; i < sampledInputSize; ++i) {
(*nearKeysVector)[i].reset();
(*searchKeysVector)[i].reset();
(*SampledNearKeysVector)[i].reset();
static const float NEAR_KEY_NORMALIZED_SQUARED_THRESHOLD = 4.0f;
for (int k = 0; k < keyCount; ++k) {
const int index = i * keyCount + k;
@ -231,9 +228,9 @@ namespace latinime {
const int y = (*sampledInputYs)[i];
const float normalizedSquaredDistance =
proximityInfo->getNormalizedSquaredDistanceFromCenterFloatG(k, x, y);
(*distanceCache_G)[index] = normalizedSquaredDistance;
(*SampledDistanceCache_G)[index] = normalizedSquaredDistance;
if (normalizedSquaredDistance < NEAR_KEY_NORMALIZED_SQUARED_THRESHOLD) {
(*nearKeysVector)[i][k] = true;
(*SampledNearKeysVector)[i][k] = true;
}
}
}
@ -638,21 +635,21 @@ namespace latinime {
// This function basically converts from a length to an edit distance. Accordingly, it's obviously
// wrong to compare with mMaxPointToKeyLength.
/* static */ float ProximityInfoStateUtils::getPointToKeyByIdLength(const float maxPointToKeyLength,
const std::vector<float> *const distanceCache_G, const int keyCount,
const std::vector<float> *const SampledDistanceCache_G, const int keyCount,
const int inputIndex, const int keyId, const float scale) {
if (keyId != NOT_AN_INDEX) {
const int index = inputIndex * keyCount + keyId;
return min((*distanceCache_G)[index] * scale, maxPointToKeyLength);
return min((*SampledDistanceCache_G)[index] * scale, maxPointToKeyLength);
}
// If the char is not a key on the keyboard then return the max length.
return static_cast<float>(MAX_POINT_TO_KEY_LENGTH);
}
/* static */ float ProximityInfoStateUtils::getPointToKeyByIdLength(const float maxPointToKeyLength,
const std::vector<float> *const distanceCache_G, const int keyCount,
const std::vector<float> *const SampledDistanceCache_G, const int keyCount,
const int inputIndex, const int keyId) {
return getPointToKeyByIdLength(maxPointToKeyLength, distanceCache_G, keyCount, inputIndex,
keyId, 1.0f);
return getPointToKeyByIdLength(
maxPointToKeyLength, SampledDistanceCache_G, keyCount, inputIndex, keyId, 1.0f);
}
// Updates probabilities of aligning to some keys and skipping.
@ -663,8 +660,8 @@ namespace latinime {
const std::vector<int> *const sampledInputYs,
const std::vector<float> *const sampledSpeedRates,
const std::vector<int> *const sampledLengthCache,
const std::vector<float> *const distanceCache_G,
std::vector<NearKeycodesSet> *nearKeysVector,
const std::vector<float> *const SampledDistanceCache_G,
std::vector<NearKeycodesSet> *SampledNearKeysVector,
std::vector<hash_map_compat<int, float> > *charProbabilities) {
static const float MIN_PROBABILITY = 0.000001f;
static const float MAX_SKIP_PROBABILITY = 0.95f;
@ -701,9 +698,9 @@ namespace latinime {
float nearestKeyDistance = static_cast<float>(MAX_POINT_TO_KEY_LENGTH);
for (int j = 0; j < keyCount; ++j) {
if ((*nearKeysVector)[i].test(j)) {
if ((*SampledNearKeysVector)[i].test(j)) {
const float distance = getPointToKeyByIdLength(
maxPointToKeyLength, distanceCache_G, keyCount, i, j);
maxPointToKeyLength, SampledDistanceCache_G, keyCount, i, j);
if (distance < nearestKeyDistance) {
nearestKeyDistance = distance;
}
@ -786,14 +783,14 @@ namespace latinime {
// Summing up probability densities of all near keys.
float sumOfProbabilityDensities = 0.0f;
for (int j = 0; j < keyCount; ++j) {
if ((*nearKeysVector)[i].test(j)) {
if ((*SampledNearKeysVector)[i].test(j)) {
float distance = sqrtf(getPointToKeyByIdLength(
maxPointToKeyLength, distanceCache_G, keyCount, i, j));
maxPointToKeyLength, SampledDistanceCache_G, keyCount, i, j));
if (i == 0 && i != sampledInputSize - 1) {
// For the first point, weighted average of distances from first point and the
// next point to the key is used as a point to key distance.
const float nextDistance = sqrtf(getPointToKeyByIdLength(
maxPointToKeyLength, distanceCache_G, keyCount, i + 1, j));
maxPointToKeyLength, SampledDistanceCache_G, keyCount, i + 1, j));
if (nextDistance < distance) {
// The distance of the first point tends to bigger than continuing
// points because the first touch by the user can be sloppy.
@ -806,7 +803,7 @@ namespace latinime {
// For the first point, weighted average of distances from last point and
// the previous point to the key is used as a point to key distance.
const float previousDistance = sqrtf(getPointToKeyByIdLength(
maxPointToKeyLength, distanceCache_G, keyCount, i - 1, j));
maxPointToKeyLength, SampledDistanceCache_G, keyCount, i - 1, j));
if (previousDistance < distance) {
// The distance of the last point tends to bigger than continuing points
// because the last touch by the user can be sloppy. So we promote the
@ -824,14 +821,14 @@ namespace latinime {
// Split the probability of an input point to keys that are close to the input point.
for (int j = 0; j < keyCount; ++j) {
if ((*nearKeysVector)[i].test(j)) {
if ((*SampledNearKeysVector)[i].test(j)) {
float distance = sqrtf(getPointToKeyByIdLength(
maxPointToKeyLength, distanceCache_G, keyCount, i, j));
maxPointToKeyLength, SampledDistanceCache_G, keyCount, i, j));
if (i == 0 && i != sampledInputSize - 1) {
// For the first point, weighted average of distances from the first point and
// the next point to the key is used as a point to key distance.
const float prevDistance = sqrtf(getPointToKeyByIdLength(
maxPointToKeyLength, distanceCache_G, keyCount, i + 1, j));
maxPointToKeyLength, SampledDistanceCache_G, keyCount, i + 1, j));
if (prevDistance < distance) {
distance = (distance + prevDistance * NEXT_DISTANCE_WEIGHT)
/ (1.0f + NEXT_DISTANCE_WEIGHT);
@ -840,7 +837,7 @@ namespace latinime {
// For the first point, weighted average of distances from last point and
// the previous point to the key is used as a point to key distance.
const float prevDistance = sqrtf(getPointToKeyByIdLength(
maxPointToKeyLength, distanceCache_G, keyCount, i - 1, j));
maxPointToKeyLength, SampledDistanceCache_G, keyCount, i - 1, j));
if (prevDistance < distance) {
distance = (distance + prevDistance * PREV_DISTANCE_WEIGHT)
/ (1.0f + PREV_DISTANCE_WEIGHT);
@ -906,10 +903,10 @@ namespace latinime {
for (int j = 0; j < keyCount; ++j) {
hash_map_compat<int, float>::iterator it = (*charProbabilities)[i].find(j);
if (it == (*charProbabilities)[i].end()){
(*nearKeysVector)[i].reset(j);
(*SampledNearKeysVector)[i].reset(j);
} else if(it->second < MIN_PROBABILITY) {
// Erases from near keys vector because it has very low probability.
(*nearKeysVector)[i].reset(j);
(*SampledNearKeysVector)[i].reset(j);
(*charProbabilities)[i].erase(j);
} else {
it->second = -logf(it->second);
@ -919,25 +916,26 @@ namespace latinime {
}
}
/* static */ void ProximityInfoStateUtils::updateSearchKeysVector(
/* static */ void ProximityInfoStateUtils::updateSampledSearchKeysVector(
const ProximityInfo *const proximityInfo, const int sampledInputSize,
const int lastSavedInputSize,
const std::vector<int> *const sampledLengthCache,
const std::vector<NearKeycodesSet> *const nearKeysVector,
std::vector<NearKeycodesSet> *searchKeysVector) {
const std::vector<NearKeycodesSet> *const SampledNearKeysVector,
std::vector<NearKeycodesSet> *sampledSearchKeysVector) {
sampledSearchKeysVector->resize(sampledInputSize);
const int readForwordLength = static_cast<int>(
hypotf(proximityInfo->getKeyboardWidth(), proximityInfo->getKeyboardHeight())
* ProximityInfoParams::SEARCH_KEY_RADIUS_RATIO);
for (int i = 0; i < sampledInputSize; ++i) {
if (i >= lastSavedInputSize) {
(*searchKeysVector)[i].reset();
(*sampledSearchKeysVector)[i].reset();
}
for (int j = max(i, lastSavedInputSize); j < sampledInputSize; ++j) {
// TODO: Investigate if this is required. This may not fail.
if ((*sampledLengthCache)[j] - (*sampledLengthCache)[i] >= readForwordLength) {
break;
}
(*searchKeysVector)[i] |= (*nearKeysVector)[j];
(*sampledSearchKeysVector)[i] |= (*SampledNearKeysVector)[j];
}
}
}

19
native/jni/src/proximity_info_state_utils.h
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@ -69,29 +69,28 @@ class ProximityInfoStateUtils {
const std::vector<int> *const sampledInputYs,
const std::vector<float> *const sampledSpeedRates,
const std::vector<int> *const sampledLengthCache,
const std::vector<float> *const distanceCache_G,
std::vector<NearKeycodesSet> *nearKeysVector,
const std::vector<float> *const SampledDistanceCache_G,
std::vector<NearKeycodesSet> *SampledNearKeysVector,
std::vector<hash_map_compat<int, float> > *charProbabilities);
static void updateSearchKeysVector(
static void updateSampledSearchKeysVector(
const ProximityInfo *const proximityInfo, const int sampledInputSize,
const int lastSavedInputSize,
const std::vector<int> *const sampledLengthCache,
const std::vector<NearKeycodesSet> *const nearKeysVector,
std::vector<NearKeycodesSet> *searchKeysVector);
const std::vector<NearKeycodesSet> *const SampledNearKeysVector,
std::vector<NearKeycodesSet> *sampledSearchKeysVector);
static float getPointToKeyByIdLength(const float maxPointToKeyLength,
const std::vector<float> *const distanceCache_G, const int keyCount,
const std::vector<float> *const SampledDistanceCache_G, const int keyCount,
const int inputIndex, const int keyId, const float scale);
static float getPointToKeyByIdLength(const float maxPointToKeyLength,
const std::vector<float> *const distanceCache_G, const int keyCount,
const std::vector<float> *const SampledDistanceCache_G, const int keyCount,
const int inputIndex, const int keyId);
static void initGeometricDistanceInfos(
const ProximityInfo *const proximityInfo, const int keyCount,
const int sampledInputSize, const int lastSavedInputSize,
const std::vector<int> *const sampledInputXs,
const std::vector<int> *const sampledInputYs,
std::vector<NearKeycodesSet> *nearKeysVector,
std::vector<NearKeycodesSet> *searchKeysVector,
std::vector<float> *distanceCache_G);
std::vector<NearKeycodesSet> *SampledNearKeysVector,
std::vector<float> *SampledDistanceCache_G);
static void initPrimaryInputWord(
const int inputSize, const int *const inputProximities, int *primaryInputWord);
static void initNormalizedSquaredDistances(