767 lines
30 KiB
C++
767 lines
30 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#define LOG_TAG "LatinIME: correction.cpp"
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#include "correction.h"
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#include "dictionary.h"
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#include "proximity_info.h"
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namespace latinime {
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//////////////////////
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// inline functions //
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//////////////////////
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static const char QUOTE = '\'';
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inline bool Correction::isQuote(const unsigned short c) {
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const unsigned short userTypedChar = mProximityInfo->getPrimaryCharAt(mInputIndex);
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return (c == QUOTE && userTypedChar != QUOTE);
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}
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////////////////
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// Correction //
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////////////////
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Correction::Correction(const int typedLetterMultiplier, const int fullWordMultiplier)
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: TYPED_LETTER_MULTIPLIER(typedLetterMultiplier), FULL_WORD_MULTIPLIER(fullWordMultiplier) {
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}
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void Correction::initCorrection(const ProximityInfo *pi, const int inputLength,
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const int maxDepth) {
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mProximityInfo = pi;
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mInputLength = inputLength;
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mMaxDepth = maxDepth;
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mMaxEditDistance = mInputLength < 5 ? 2 : mInputLength / 2;
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}
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void Correction::initCorrectionState(
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const int rootPos, const int childCount, const bool traverseAll) {
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latinime::initCorrectionState(mCorrectionStates, rootPos, childCount, traverseAll);
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// TODO: remove
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mCorrectionStates[0].mTransposedPos = mTransposedPos;
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mCorrectionStates[0].mExcessivePos = mExcessivePos;
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mCorrectionStates[0].mSkipPos = mSkipPos;
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}
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void Correction::setCorrectionParams(const int skipPos, const int excessivePos,
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const int transposedPos, const int spaceProximityPos, const int missingSpacePos) {
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// TODO: remove
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mTransposedPos = transposedPos;
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mExcessivePos = excessivePos;
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mSkipPos = skipPos;
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// TODO: remove
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mCorrectionStates[0].mTransposedPos = transposedPos;
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mCorrectionStates[0].mExcessivePos = excessivePos;
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mCorrectionStates[0].mSkipPos = skipPos;
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mSpaceProximityPos = spaceProximityPos;
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mMissingSpacePos = missingSpacePos;
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}
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void Correction::checkState() {
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if (DEBUG_DICT) {
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int inputCount = 0;
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if (mSkipPos >= 0) ++inputCount;
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if (mExcessivePos >= 0) ++inputCount;
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if (mTransposedPos >= 0) ++inputCount;
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// TODO: remove this assert
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assert(inputCount <= 1);
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}
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}
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int Correction::getFreqForSplitTwoWords(const int firstFreq, const int secondFreq) {
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return Correction::RankingAlgorithm::calcFreqForSplitTwoWords(firstFreq, secondFreq, this);
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}
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int Correction::getFinalFreq(const int freq, unsigned short **word, int *wordLength) {
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const int outputIndex = mTerminalOutputIndex;
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const int inputIndex = mTerminalInputIndex;
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*wordLength = outputIndex + 1;
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if (mProximityInfo->sameAsTyped(mWord, outputIndex + 1) || outputIndex < MIN_SUGGEST_DEPTH) {
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return -1;
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}
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*word = mWord;
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return Correction::RankingAlgorithm::calculateFinalFreq(
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inputIndex, outputIndex, freq, mEditDistanceTable, this);
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}
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bool Correction::initProcessState(const int outputIndex) {
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if (mCorrectionStates[outputIndex].mChildCount <= 0) {
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return false;
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}
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mOutputIndex = outputIndex;
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--(mCorrectionStates[outputIndex].mChildCount);
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mInputIndex = mCorrectionStates[outputIndex].mInputIndex;
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mNeedsToTraverseAllNodes = mCorrectionStates[outputIndex].mNeedsToTraverseAllNodes;
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mProximityCount = mCorrectionStates[outputIndex].mProximityCount;
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mTransposedCount = mCorrectionStates[outputIndex].mTransposedCount;
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mExcessiveCount = mCorrectionStates[outputIndex].mExcessiveCount;
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mSkippedCount = mCorrectionStates[outputIndex].mSkippedCount;
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mLastCharExceeded = mCorrectionStates[outputIndex].mLastCharExceeded;
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mTransposedPos = mCorrectionStates[outputIndex].mTransposedPos;
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mExcessivePos = mCorrectionStates[outputIndex].mExcessivePos;
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mSkipPos = mCorrectionStates[outputIndex].mSkipPos;
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mMatching = false;
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mProximityMatching = false;
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mTransposing = false;
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mExceeding = false;
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mSkipping = false;
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return true;
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}
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int Correction::goDownTree(
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const int parentIndex, const int childCount, const int firstChildPos) {
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mCorrectionStates[mOutputIndex].mParentIndex = parentIndex;
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mCorrectionStates[mOutputIndex].mChildCount = childCount;
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mCorrectionStates[mOutputIndex].mSiblingPos = firstChildPos;
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return mOutputIndex;
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}
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// TODO: remove
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int Correction::getOutputIndex() {
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return mOutputIndex;
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}
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// TODO: remove
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int Correction::getInputIndex() {
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return mInputIndex;
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}
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// TODO: remove
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bool Correction::needsToTraverseAllNodes() {
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return mNeedsToTraverseAllNodes;
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}
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void Correction::incrementInputIndex() {
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++mInputIndex;
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}
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void Correction::incrementOutputIndex() {
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++mOutputIndex;
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mCorrectionStates[mOutputIndex].mParentIndex = mCorrectionStates[mOutputIndex - 1].mParentIndex;
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mCorrectionStates[mOutputIndex].mChildCount = mCorrectionStates[mOutputIndex - 1].mChildCount;
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mCorrectionStates[mOutputIndex].mSiblingPos = mCorrectionStates[mOutputIndex - 1].mSiblingPos;
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mCorrectionStates[mOutputIndex].mInputIndex = mInputIndex;
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mCorrectionStates[mOutputIndex].mNeedsToTraverseAllNodes = mNeedsToTraverseAllNodes;
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mCorrectionStates[mOutputIndex].mProximityCount = mProximityCount;
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mCorrectionStates[mOutputIndex].mTransposedCount = mTransposedCount;
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mCorrectionStates[mOutputIndex].mExcessiveCount = mExcessiveCount;
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mCorrectionStates[mOutputIndex].mSkippedCount = mSkippedCount;
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mCorrectionStates[mOutputIndex].mSkipPos = mSkipPos;
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mCorrectionStates[mOutputIndex].mTransposedPos = mTransposedPos;
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mCorrectionStates[mOutputIndex].mExcessivePos = mExcessivePos;
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mCorrectionStates[mOutputIndex].mLastCharExceeded = mLastCharExceeded;
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mCorrectionStates[mOutputIndex].mMatching = mMatching;
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mCorrectionStates[mOutputIndex].mProximityMatching = mProximityMatching;
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mCorrectionStates[mOutputIndex].mTransposing = mTransposing;
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mCorrectionStates[mOutputIndex].mExceeding = mExceeding;
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mCorrectionStates[mOutputIndex].mSkipping = mSkipping;
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}
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void Correction::startToTraverseAllNodes() {
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mNeedsToTraverseAllNodes = true;
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}
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bool Correction::needsToPrune() const {
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return mOutputIndex - 1 >= mMaxDepth || mProximityCount > mMaxEditDistance;
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}
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// TODO: inline?
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Correction::CorrectionType Correction::processSkipChar(
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const int32_t c, const bool isTerminal, const bool inputIndexIncremented) {
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mWord[mOutputIndex] = c;
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if (needsToTraverseAllNodes() && isTerminal) {
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mTerminalInputIndex = mInputIndex - (inputIndexIncremented ? 1 : 0);
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mTerminalOutputIndex = mOutputIndex;
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incrementOutputIndex();
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return TRAVERSE_ALL_ON_TERMINAL;
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} else {
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incrementOutputIndex();
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return TRAVERSE_ALL_NOT_ON_TERMINAL;
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}
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}
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Correction::CorrectionType Correction::processCharAndCalcState(
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const int32_t c, const bool isTerminal) {
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const int correctionCount = (mSkippedCount + mExcessiveCount + mTransposedCount);
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// TODO: Change the limit if we'll allow two or more corrections
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const bool noCorrectionsHappenedSoFar = correctionCount == 0;
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const bool canTryCorrection = noCorrectionsHappenedSoFar;
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if (mNeedsToTraverseAllNodes || isQuote(c)) {
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bool incremented = false;
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if (mLastCharExceeded && mInputIndex == mInputLength - 1) {
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// TODO: Do not check the proximity if EditDistance exceeds the threshold
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const int matchId = mProximityInfo->getMatchedProximityId(mInputIndex, c, true);
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if (matchId == ProximityInfo::SAME_OR_ACCENTED_OR_CAPITALIZED_CHAR) {
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mLastCharExceeded = false;
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--mExcessiveCount;
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} else if (matchId == ProximityInfo::NEAR_PROXIMITY_CHAR) {
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mLastCharExceeded = false;
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--mExcessiveCount;
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++mProximityCount;
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}
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incrementInputIndex();
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incremented = true;
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}
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return processSkipChar(c, isTerminal, incremented);
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}
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if (mExcessivePos >= 0) {
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if (mExcessiveCount == 0 && mExcessivePos < mOutputIndex) {
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mExcessivePos = mOutputIndex;
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}
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if (mExcessivePos < mInputLength - 1) {
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mExceeding = mExcessivePos == mInputIndex && canTryCorrection;
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}
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}
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if (mSkipPos >= 0) {
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if (mSkippedCount == 0 && mSkipPos < mOutputIndex) {
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if (DEBUG_DICT) {
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assert(mSkipPos == mOutputIndex - 1);
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}
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mSkipPos = mOutputIndex;
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}
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mSkipping = mSkipPos == mOutputIndex && canTryCorrection;
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}
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if (mTransposedPos >= 0) {
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if (mTransposedCount == 0 && mTransposedPos < mOutputIndex) {
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mTransposedPos = mOutputIndex;
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}
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if (mTransposedPos < mInputLength - 1) {
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mTransposing = mInputIndex == mTransposedPos && canTryCorrection;
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}
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}
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bool secondTransposing = false;
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if (mTransposedCount % 2 == 1) {
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if (mProximityInfo->getMatchedProximityId(mInputIndex - 1, c, false)
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== ProximityInfo::SAME_OR_ACCENTED_OR_CAPITALIZED_CHAR) {
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++mTransposedCount;
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secondTransposing = true;
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} else if (mCorrectionStates[mOutputIndex].mExceeding) {
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--mTransposedCount;
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++mExcessiveCount;
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--mExcessivePos;
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incrementInputIndex();
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} else {
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--mTransposedCount;
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if (DEBUG_CORRECTION) {
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DUMP_WORD(mWord, mOutputIndex);
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LOGI("UNRELATED(0): %d, %d, %d, %d, %c", mProximityCount, mSkippedCount,
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mTransposedCount, mExcessiveCount, c);
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}
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return UNRELATED;
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}
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}
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// TODO: Change the limit if we'll allow two or more proximity chars with corrections
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const bool checkProximityChars = noCorrectionsHappenedSoFar || mProximityCount == 0;
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const int matchedProximityCharId = secondTransposing
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? ProximityInfo::SAME_OR_ACCENTED_OR_CAPITALIZED_CHAR
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: mProximityInfo->getMatchedProximityId(mInputIndex, c, checkProximityChars);
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if (ProximityInfo::UNRELATED_CHAR == matchedProximityCharId) {
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// TODO: Optimize
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// As the current char turned out to be an unrelated char,
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// we will try other correction-types. Please note that mCorrectionStates[mOutputIndex]
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// here refers to the previous state.
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if (canTryCorrection && mCorrectionStates[mOutputIndex].mProximityMatching
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&& mCorrectionStates[mOutputIndex].mExceeding
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&& mProximityInfo->getMatchedProximityId(mInputIndex, mWord[mOutputIndex], false)
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== ProximityInfo::SAME_OR_ACCENTED_OR_CAPITALIZED_CHAR) {
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// Conversion p->e
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++mExcessiveCount;
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--mProximityCount;
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} else if (mInputIndex < mInputLength - 1 && mOutputIndex > 0 && mTransposedCount > 0
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&& !mCorrectionStates[mOutputIndex].mTransposing
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&& mCorrectionStates[mOutputIndex - 1].mTransposing
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&& mProximityInfo->getMatchedProximityId(
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mInputIndex, mWord[mOutputIndex - 1], false)
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== ProximityInfo::SAME_OR_ACCENTED_OR_CAPITALIZED_CHAR
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&& mProximityInfo->getMatchedProximityId(mInputIndex + 1, c, false)
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== ProximityInfo::SAME_OR_ACCENTED_OR_CAPITALIZED_CHAR) {
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// Conversion t->e
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// Example:
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// occaisional -> occa sional
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// mmmmttx -> mmmm(E)mmmmmm
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mTransposedCount -= 2;
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++mExcessiveCount;
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++mInputIndex;
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} else if (mOutputIndex > 0 && mInputIndex > 0 && mTransposedCount > 0
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&& !mCorrectionStates[mOutputIndex].mTransposing
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&& mCorrectionStates[mOutputIndex - 1].mTransposing
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&& mProximityInfo->getMatchedProximityId(mInputIndex - 1, c, false)
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== ProximityInfo::SAME_OR_ACCENTED_OR_CAPITALIZED_CHAR) {
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// Conversion t->s
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// Example:
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// chcolate -> chocolate
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// mmttx -> mmsmmmmmm
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mTransposedCount -= 2;
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++mSkippedCount;
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--mInputIndex;
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} else if (canTryCorrection && mInputIndex > 0
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&& mCorrectionStates[mOutputIndex].mProximityMatching
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&& mCorrectionStates[mOutputIndex].mSkipping
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&& mProximityInfo->getMatchedProximityId(mInputIndex - 1, c, false)
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== ProximityInfo::SAME_OR_ACCENTED_OR_CAPITALIZED_CHAR) {
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// Conversion p->s
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// Note: This logic tries saving cases like contrst --> contrast -- "a" is one of
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// proximity chars of "s", but it should rather be handled as a skipped char.
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++mSkippedCount;
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--mProximityCount;
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return processSkipChar(c, isTerminal, false);
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} else if ((mExceeding || mTransposing) && mInputIndex - 1 < mInputLength
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&& mProximityInfo->getMatchedProximityId(mInputIndex + 1, c, false)
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== ProximityInfo::SAME_OR_ACCENTED_OR_CAPITALIZED_CHAR) {
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// 1.2. Excessive or transpose correction
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if (mTransposing) {
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++mTransposedCount;
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} else {
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++mExcessiveCount;
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incrementInputIndex();
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}
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} else if (mSkipping) {
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// 3. Skip correction
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++mSkippedCount;
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return processSkipChar(c, isTerminal, false);
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} else {
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if (DEBUG_CORRECTION) {
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DUMP_WORD(mWord, mOutputIndex);
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LOGI("UNRELATED(1): %d, %d, %d, %d, %c", mProximityCount, mSkippedCount,
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mTransposedCount, mExcessiveCount, c);
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}
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return UNRELATED;
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}
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} else if (secondTransposing
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|| ProximityInfo::SAME_OR_ACCENTED_OR_CAPITALIZED_CHAR == matchedProximityCharId) {
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// If inputIndex is greater than mInputLength, that means there is no
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// proximity chars. So, we don't need to check proximity.
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mMatching = true;
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} else if (ProximityInfo::NEAR_PROXIMITY_CHAR == matchedProximityCharId) {
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mProximityMatching = true;
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incrementProximityCount();
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}
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mWord[mOutputIndex] = c;
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// 4. Last char excessive correction
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mLastCharExceeded = mExcessiveCount == 0 && mSkippedCount == 0 && mTransposedCount == 0
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&& mProximityCount == 0 && (mInputIndex == mInputLength - 2);
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const bool isSameAsUserTypedLength = (mInputLength == mInputIndex + 1) || mLastCharExceeded;
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if (mLastCharExceeded) {
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++mExcessiveCount;
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}
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// Start traversing all nodes after the index exceeds the user typed length
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if (isSameAsUserTypedLength) {
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startToTraverseAllNodes();
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}
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const bool needsToTryOnTerminalForTheLastPossibleExcessiveChar =
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mExceeding && mInputIndex == mInputLength - 2;
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// Finally, we are ready to go to the next character, the next "virtual node".
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// We should advance the input index.
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// We do this in this branch of the 'if traverseAllNodes' because we are still matching
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// characters to input; the other branch is not matching them but searching for
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// completions, this is why it does not have to do it.
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incrementInputIndex();
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// Also, the next char is one "virtual node" depth more than this char.
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incrementOutputIndex();
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if ((needsToTryOnTerminalForTheLastPossibleExcessiveChar
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|| isSameAsUserTypedLength) && isTerminal) {
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mTerminalInputIndex = mInputIndex - 1;
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mTerminalOutputIndex = mOutputIndex - 1;
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return ON_TERMINAL;
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} else {
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return NOT_ON_TERMINAL;
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}
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}
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Correction::~Correction() {
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}
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/////////////////////////
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// static inline utils //
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/////////////////////////
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static const int TWO_31ST_DIV_255 = S_INT_MAX / 255;
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static inline int capped255MultForFullMatchAccentsOrCapitalizationDifference(const int num) {
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return (num < TWO_31ST_DIV_255 ? 255 * num : S_INT_MAX);
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}
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static const int TWO_31ST_DIV_2 = S_INT_MAX / 2;
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inline static void multiplyIntCapped(const int multiplier, int *base) {
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const int temp = *base;
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if (temp != S_INT_MAX) {
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// Branch if multiplier == 2 for the optimization
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if (multiplier == 2) {
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*base = TWO_31ST_DIV_2 >= temp ? temp << 1 : S_INT_MAX;
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} else {
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const int tempRetval = temp * multiplier;
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*base = tempRetval >= temp ? tempRetval : S_INT_MAX;
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}
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}
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}
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inline static int powerIntCapped(const int base, const int n) {
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if (n == 0) return 1;
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if (base == 2) {
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return n < 31 ? 1 << n : S_INT_MAX;
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} else {
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int ret = base;
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for (int i = 1; i < n; ++i) multiplyIntCapped(base, &ret);
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return ret;
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}
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}
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inline static void multiplyRate(const int rate, int *freq) {
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if (*freq != S_INT_MAX) {
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if (*freq > 1000000) {
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*freq /= 100;
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multiplyIntCapped(rate, freq);
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} else {
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multiplyIntCapped(rate, freq);
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*freq /= 100;
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}
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}
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}
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inline static int getQuoteCount(const unsigned short* word, const int length) {
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int quoteCount = 0;
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for (int i = 0; i < length; ++i) {
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if(word[i] == '\'') {
|
|
++quoteCount;
|
|
}
|
|
}
|
|
return quoteCount;
|
|
}
|
|
|
|
/* static */
|
|
inline static int editDistance(
|
|
int* editDistanceTable, const unsigned short* input,
|
|
const int inputLength, const unsigned short* output, const int outputLength) {
|
|
// dp[li][lo] dp[a][b] = dp[ a * lo + b]
|
|
int* dp = editDistanceTable;
|
|
const int li = inputLength + 1;
|
|
const int lo = outputLength + 1;
|
|
for (int i = 0; i < li; ++i) {
|
|
dp[lo * i] = i;
|
|
}
|
|
for (int i = 0; i < lo; ++i) {
|
|
dp[i] = i;
|
|
}
|
|
|
|
for (int i = 0; i < li - 1; ++i) {
|
|
for (int j = 0; j < lo - 1; ++j) {
|
|
const uint32_t ci = Dictionary::toBaseLowerCase(input[i]);
|
|
const uint32_t co = Dictionary::toBaseLowerCase(output[j]);
|
|
const uint16_t cost = (ci == co) ? 0 : 1;
|
|
dp[(i + 1) * lo + (j + 1)] = min(dp[i * lo + (j + 1)] + 1,
|
|
min(dp[(i + 1) * lo + j] + 1, dp[i * lo + j] + cost));
|
|
if (i > 0 && j > 0 && ci == Dictionary::toBaseLowerCase(output[j - 1])
|
|
&& co == Dictionary::toBaseLowerCase(input[i - 1])) {
|
|
dp[(i + 1) * lo + (j + 1)] = min(
|
|
dp[(i + 1) * lo + (j + 1)], dp[(i - 1) * lo + (j - 1)] + cost);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (DEBUG_EDIT_DISTANCE) {
|
|
LOGI("IN = %d, OUT = %d", inputLength, outputLength);
|
|
for (int i = 0; i < li; ++i) {
|
|
for (int j = 0; j < lo; ++j) {
|
|
LOGI("EDIT[%d][%d], %d", i, j, dp[i * lo + j]);
|
|
}
|
|
}
|
|
}
|
|
return dp[li * lo - 1];
|
|
}
|
|
|
|
//////////////////////
|
|
// RankingAlgorithm //
|
|
//////////////////////
|
|
|
|
/* static */
|
|
int Correction::RankingAlgorithm::calculateFinalFreq(const int inputIndex, const int outputIndex,
|
|
const int freq, int* editDistanceTable, const Correction* correction) {
|
|
const int excessivePos = correction->getExcessivePos();
|
|
const int inputLength = correction->mInputLength;
|
|
const int typedLetterMultiplier = correction->TYPED_LETTER_MULTIPLIER;
|
|
const int fullWordMultiplier = correction->FULL_WORD_MULTIPLIER;
|
|
const ProximityInfo *proximityInfo = correction->mProximityInfo;
|
|
const int skippedCount = correction->mSkippedCount;
|
|
const int transposedCount = correction->mTransposedCount / 2;
|
|
const int excessiveCount = correction->mExcessiveCount + correction->mTransposedCount % 2;
|
|
const int proximityMatchedCount = correction->mProximityCount;
|
|
const bool lastCharExceeded = correction->mLastCharExceeded;
|
|
if (skippedCount >= inputLength || inputLength == 0) {
|
|
return -1;
|
|
}
|
|
|
|
// TODO: find more robust way
|
|
bool sameLength = lastCharExceeded ? (inputLength == inputIndex + 2)
|
|
: (inputLength == inputIndex + 1);
|
|
|
|
// TODO: use mExcessiveCount
|
|
const int matchCount = inputLength - correction->mProximityCount - excessiveCount;
|
|
|
|
const unsigned short* word = correction->mWord;
|
|
const bool skipped = skippedCount > 0;
|
|
|
|
const int quoteDiffCount = max(0, getQuoteCount(word, outputIndex + 1)
|
|
- getQuoteCount(proximityInfo->getPrimaryInputWord(), inputLength));
|
|
|
|
// TODO: Calculate edit distance for transposed and excessive
|
|
int ed = 0;
|
|
int adjustedProximityMatchedCount = proximityMatchedCount;
|
|
|
|
int finalFreq = freq;
|
|
|
|
// TODO: Optimize this.
|
|
// TODO: Ignoring edit distance for transposed char, for now
|
|
if (transposedCount == 0 && (proximityMatchedCount > 0 || skipped || excessiveCount > 0)) {
|
|
const unsigned short* primaryInputWord = proximityInfo->getPrimaryInputWord();
|
|
ed = editDistance(editDistanceTable, primaryInputWord,
|
|
inputLength, word, outputIndex + 1);
|
|
const int matchWeight = powerIntCapped(typedLetterMultiplier,
|
|
max(inputLength, outputIndex + 1) - ed);
|
|
multiplyIntCapped(matchWeight, &finalFreq);
|
|
|
|
// TODO: Demote further if there are two or more excessive chars with longer user input?
|
|
if (inputLength > outputIndex + 1) {
|
|
multiplyRate(INPUT_EXCEEDS_OUTPUT_DEMOTION_RATE, &finalFreq);
|
|
}
|
|
|
|
ed = max(0, ed - quoteDiffCount);
|
|
|
|
if (ed == 1 && (inputLength == outputIndex || inputLength == outputIndex + 2)) {
|
|
// Promote a word with just one skipped or excessive char
|
|
if (sameLength) {
|
|
multiplyRate(WORDS_WITH_JUST_ONE_CORRECTION_PROMOTION_RATE, &finalFreq);
|
|
} else {
|
|
multiplyIntCapped(typedLetterMultiplier, &finalFreq);
|
|
}
|
|
} else if (ed == 0) {
|
|
multiplyIntCapped(typedLetterMultiplier, &finalFreq);
|
|
sameLength = true;
|
|
}
|
|
adjustedProximityMatchedCount = min(max(0, ed - (outputIndex + 1 - inputLength)),
|
|
proximityMatchedCount);
|
|
} else {
|
|
// TODO: Calculate the edit distance for transposed char
|
|
const int matchWeight = powerIntCapped(typedLetterMultiplier, matchCount);
|
|
multiplyIntCapped(matchWeight, &finalFreq);
|
|
}
|
|
|
|
if (proximityInfo->getMatchedProximityId(0, word[0], true)
|
|
== ProximityInfo::UNRELATED_CHAR) {
|
|
multiplyRate(FIRST_CHAR_DIFFERENT_DEMOTION_RATE, &finalFreq);
|
|
}
|
|
|
|
///////////////////////////////////////////////
|
|
// Promotion and Demotion for each correction
|
|
|
|
// Demotion for a word with missing character
|
|
if (skipped) {
|
|
const int demotionRate = WORDS_WITH_MISSING_CHARACTER_DEMOTION_RATE
|
|
* (10 * inputLength - WORDS_WITH_MISSING_CHARACTER_DEMOTION_START_POS_10X)
|
|
/ (10 * inputLength
|
|
- WORDS_WITH_MISSING_CHARACTER_DEMOTION_START_POS_10X + 10);
|
|
if (DEBUG_DICT_FULL) {
|
|
LOGI("Demotion rate for missing character is %d.", demotionRate);
|
|
}
|
|
multiplyRate(demotionRate, &finalFreq);
|
|
}
|
|
|
|
// Demotion for a word with transposed character
|
|
if (transposedCount > 0) multiplyRate(
|
|
WORDS_WITH_TRANSPOSED_CHARACTERS_DEMOTION_RATE, &finalFreq);
|
|
|
|
// Demotion for a word with excessive character
|
|
if (excessiveCount > 0) {
|
|
multiplyRate(WORDS_WITH_EXCESSIVE_CHARACTER_DEMOTION_RATE, &finalFreq);
|
|
if (!lastCharExceeded && !proximityInfo->existsAdjacentProximityChars(excessivePos)) {
|
|
if (DEBUG_CORRECTION_FREQ) {
|
|
LOGI("Double excessive demotion");
|
|
}
|
|
// If an excessive character is not adjacent to the left char or the right char,
|
|
// we will demote this word.
|
|
multiplyRate(WORDS_WITH_EXCESSIVE_CHARACTER_OUT_OF_PROXIMITY_DEMOTION_RATE, &finalFreq);
|
|
}
|
|
}
|
|
|
|
// Promotion for a word with proximity characters
|
|
for (int i = 0; i < adjustedProximityMatchedCount; ++i) {
|
|
// A word with proximity corrections
|
|
if (DEBUG_DICT_FULL) {
|
|
LOGI("Found a proximity correction.");
|
|
}
|
|
multiplyIntCapped(typedLetterMultiplier, &finalFreq);
|
|
multiplyRate(WORDS_WITH_PROXIMITY_CHARACTER_DEMOTION_RATE, &finalFreq);
|
|
}
|
|
|
|
const int errorCount = adjustedProximityMatchedCount > 0
|
|
? adjustedProximityMatchedCount
|
|
: (proximityMatchedCount + transposedCount);
|
|
multiplyRate(
|
|
100 - CORRECTION_COUNT_RATE_DEMOTION_RATE_BASE * errorCount / inputLength, &finalFreq);
|
|
|
|
// Promotion for an exactly matched word
|
|
if (ed == 0) {
|
|
// Full exact match
|
|
if (sameLength && transposedCount == 0 && !skipped && excessiveCount == 0) {
|
|
finalFreq = capped255MultForFullMatchAccentsOrCapitalizationDifference(finalFreq);
|
|
}
|
|
}
|
|
|
|
// Promote a word with no correction
|
|
if (proximityMatchedCount == 0 && transposedCount == 0 && !skipped && excessiveCount == 0) {
|
|
multiplyRate(FULL_MATCHED_WORDS_PROMOTION_RATE, &finalFreq);
|
|
}
|
|
|
|
// TODO: Check excessive count and transposed count
|
|
// TODO: Remove this if possible
|
|
/*
|
|
If the last character of the user input word is the same as the next character
|
|
of the output word, and also all of characters of the user input are matched
|
|
to the output word, we'll promote that word a bit because
|
|
that word can be considered the combination of skipped and matched characters.
|
|
This means that the 'sm' pattern wins over the 'ma' pattern.
|
|
e.g.)
|
|
shel -> shell [mmmma] or [mmmsm]
|
|
hel -> hello [mmmaa] or [mmsma]
|
|
m ... matching
|
|
s ... skipping
|
|
a ... traversing all
|
|
t ... transposing
|
|
e ... exceeding
|
|
p ... proximity matching
|
|
*/
|
|
if (matchCount == inputLength && matchCount >= 2 && !skipped
|
|
&& word[matchCount] == word[matchCount - 1]) {
|
|
multiplyRate(WORDS_WITH_MATCH_SKIP_PROMOTION_RATE, &finalFreq);
|
|
}
|
|
|
|
// TODO: Do not use sameLength?
|
|
if (sameLength) {
|
|
multiplyIntCapped(fullWordMultiplier, &finalFreq);
|
|
}
|
|
|
|
if (DEBUG_DICT_FULL) {
|
|
LOGI("calc: %d, %d", outputIndex, sameLength);
|
|
}
|
|
|
|
if (DEBUG_CORRECTION_FREQ) {
|
|
DUMP_WORD(correction->mWord, outputIndex + 1);
|
|
LOGI("FinalFreq: [P%d, S%d, T%d, E%d] %d, %d, %d, %d, %d", proximityMatchedCount,
|
|
skippedCount, transposedCount, excessiveCount, lastCharExceeded, sameLength,
|
|
quoteDiffCount, ed, finalFreq);
|
|
}
|
|
|
|
return finalFreq;
|
|
}
|
|
|
|
/* static */
|
|
int Correction::RankingAlgorithm::calcFreqForSplitTwoWords(
|
|
const int firstFreq, const int secondFreq, const Correction* correction) {
|
|
const int spaceProximityPos = correction->mSpaceProximityPos;
|
|
const int missingSpacePos = correction->mMissingSpacePos;
|
|
if (DEBUG_DICT) {
|
|
int inputCount = 0;
|
|
if (spaceProximityPos >= 0) ++inputCount;
|
|
if (missingSpacePos >= 0) ++inputCount;
|
|
assert(inputCount <= 1);
|
|
}
|
|
const bool isSpaceProximity = spaceProximityPos >= 0;
|
|
const int inputLength = correction->mInputLength;
|
|
const int firstWordLength = isSpaceProximity ? spaceProximityPos : missingSpacePos;
|
|
const int secondWordLength = isSpaceProximity
|
|
? (inputLength - spaceProximityPos - 1)
|
|
: (inputLength - missingSpacePos);
|
|
const int typedLetterMultiplier = correction->TYPED_LETTER_MULTIPLIER;
|
|
|
|
if (firstWordLength == 0 || secondWordLength == 0) {
|
|
return 0;
|
|
}
|
|
const int firstDemotionRate = 100 - 100 / (firstWordLength + 1);
|
|
int tempFirstFreq = firstFreq;
|
|
multiplyRate(firstDemotionRate, &tempFirstFreq);
|
|
|
|
const int secondDemotionRate = 100 - 100 / (secondWordLength + 1);
|
|
int tempSecondFreq = secondFreq;
|
|
multiplyRate(secondDemotionRate, &tempSecondFreq);
|
|
|
|
const int totalLength = firstWordLength + secondWordLength;
|
|
|
|
// Promote pairFreq with multiplying by 2, because the word length is the same as the typed
|
|
// length.
|
|
int totalFreq = tempFirstFreq + tempSecondFreq;
|
|
|
|
// This is a workaround to try offsetting the not-enough-demotion which will be done in
|
|
// calcNormalizedScore in Utils.java.
|
|
// In calcNormalizedScore the score will be demoted by (1 - 1 / length)
|
|
// but we demoted only (1 - 1 / (length + 1)) so we will additionally adjust freq by
|
|
// (1 - 1 / length) / (1 - 1 / (length + 1)) = (1 - 1 / (length * length))
|
|
const int normalizedScoreNotEnoughDemotionAdjustment = 100 - 100 / (totalLength * totalLength);
|
|
multiplyRate(normalizedScoreNotEnoughDemotionAdjustment, &totalFreq);
|
|
|
|
// At this moment, totalFreq is calculated by the following formula:
|
|
// (firstFreq * (1 - 1 / (firstWordLength + 1)) + secondFreq * (1 - 1 / (secondWordLength + 1)))
|
|
// * (1 - 1 / totalLength) / (1 - 1 / (totalLength + 1))
|
|
|
|
multiplyIntCapped(powerIntCapped(typedLetterMultiplier, totalLength), &totalFreq);
|
|
|
|
// This is another workaround to offset the demotion which will be done in
|
|
// calcNormalizedScore in Utils.java.
|
|
// In calcNormalizedScore the score will be demoted by (1 - 1 / length) so we have to promote
|
|
// the same amount because we already have adjusted the synthetic freq of this "missing or
|
|
// mistyped space" suggestion candidate above in this method.
|
|
const int normalizedScoreDemotionRateOffset = (100 + 100 / totalLength);
|
|
multiplyRate(normalizedScoreDemotionRateOffset, &totalFreq);
|
|
|
|
if (isSpaceProximity) {
|
|
// A word pair with one space proximity correction
|
|
if (DEBUG_DICT) {
|
|
LOGI("Found a word pair with space proximity correction.");
|
|
}
|
|
multiplyIntCapped(typedLetterMultiplier, &totalFreq);
|
|
multiplyRate(WORDS_WITH_PROXIMITY_CHARACTER_DEMOTION_RATE, &totalFreq);
|
|
}
|
|
|
|
multiplyRate(WORDS_WITH_MISSING_SPACE_CHARACTER_DEMOTION_RATE, &totalFreq);
|
|
return totalFreq;
|
|
}
|
|
|
|
} // namespace latinime
|