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Demote skipped characters matched words with respect to length. 

Words that matched user input with skipped characters used to be demoted
in BinaryDictionary by a constant factor and not at all in those dictionaries
implemented in java code. To represent the fact that the impact of a skipped
character gets larger as the word is shorter, this change will implement a
demotion that gets larger as the typed word is shorter. The demotion rate
is (n - 2) / (n - 1) where n is the length of the typed word for n >= 2.
It implements it for both BinaryDictionary and java dictionaries.

Bug: 3340731
Change-Id: I3a18be80a9708981d56a950dc25fe08f018b5b89
main
Jean Chalard 2011-03-03 10:22:10 +09:00
parent 50a4cb403f
commit 07a8406bc1
4 changed files with 47 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
java/src/com/android/inputmethod/latin/ExpandableDictionary.java
View File

@ -230,6 +230,16 @@ public class ExpandableDictionary extends Dictionary {
return (node == null) ? -1 : node.mFrequency;
}
private static int computeSkippedWordFinalFreq(int freq, int snr, int inputLength) {
// The computation itself makes sense for >= 2, but the == 2 case returns 0
// anyway so we may as well test against 3 instead and return the constant
if (inputLength >= 3) {
return (freq * snr * (inputLength - 2)) / (inputLength - 1);
} else {
return 0;
}
}
/**
* Recursively traverse the tree for words that match the input. Input consists of
* a list of arrays. Each item in the list is one input character position. An input
@ -249,6 +259,7 @@ public class ExpandableDictionary extends Dictionary {
* inputIndex
* @param callback the callback class for adding a word
*/
// TODO: Share this routine with the native code for BinaryDictionary
protected void getWordsRec(NodeArray roots, final WordComposer codes, final char[] word,
final int depth, boolean completion, int snr, int inputIndex, int skipPos,
WordCallback callback) {
@ -275,8 +286,14 @@ public class ExpandableDictionary extends Dictionary {
if (completion) {
word[depth] = c;
if (terminal) {
if (!callback.addWord(word, 0, depth + 1, freq * snr, mDicTypeId,
DataType.UNIGRAM)) {
final int finalFreq;
if (skipPos < 0) {
finalFreq = freq * snr;
} else {
finalFreq = computeSkippedWordFinalFreq(freq, snr, mInputLength);
}
if (!callback.addWord(word, 0, depth + 1, finalFreq, mDicTypeId,
DataType.UNIGRAM)) {
return;
}
}
@ -307,8 +324,14 @@ public class ExpandableDictionary extends Dictionary {
if (terminal) {
if (INCLUDE_TYPED_WORD_IF_VALID
|| !same(word, depth + 1, codes.getTypedWord())) {
int finalFreq = freq * snr * addedAttenuation;
if (skipPos < 0) finalFreq *= FULL_WORD_FREQ_MULTIPLIER;
final int finalFreq;
if (skipPos < 0) {
finalFreq = freq * snr * addedAttenuation
* FULL_WORD_FREQ_MULTIPLIER;
} else {
finalFreq = computeSkippedWordFinalFreq(freq,
snr * addedAttenuation, mInputLength);
}
callback.addWord(word, 0, depth + 1, finalFreq, mDicTypeId,
DataType.UNIGRAM);
}

2
native/src/defines.h
View File

@ -135,7 +135,7 @@ static void prof_out(void) {
#define SUGGEST_WORDS_WITH_TRANSPOSED_CHARACTERS true
// The following "rate"s are used as a multiplier before dividing by 100, so they are in percent.
#define WORDS_WITH_MISSING_CHARACTER_DEMOTION_RATE 75
#define WORDS_WITH_MISSING_CHARACTER_DEMOTION_RATE 100
#define WORDS_WITH_MISSING_SPACE_CHARACTER_DEMOTION_RATE 80
#define WORDS_WITH_EXCESSIVE_CHARACTER_DEMOTION_RATE 75
#define WORDS_WITH_EXCESSIVE_CHARACTER_OUT_OF_PROXIMITY_DEMOTION_RATE 75

13
native/src/unigram_dictionary.cpp
View File

@ -457,10 +457,17 @@ static inline int capped255MultForFullMatchAccentsOrCapitalizationDifference(con
}
inline int UnigramDictionary::calculateFinalFreq(const int inputIndex, const int depth,
const int matchWeight, const int skipPos, const int excessivePos, const int transposedPos,
const int freq, const bool sameLength) {
const int freq, const bool sameLength) const {
// TODO: Demote by edit distance
int finalFreq = freq * matchWeight;
if (skipPos >= 0) multiplyRate(WORDS_WITH_MISSING_CHARACTER_DEMOTION_RATE, &finalFreq);
if (skipPos >= 0) {
if (mInputLength >= 3) {
multiplyRate(WORDS_WITH_MISSING_CHARACTER_DEMOTION_RATE *
(mInputLength - 2) / (mInputLength - 1), &finalFreq);
} else {
finalFreq = 0;
}
}
if (transposedPos >= 0) multiplyRate(
WORDS_WITH_TRANSPOSED_CHARACTERS_DEMOTION_RATE, &finalFreq);
if (excessivePos >= 0) {
@ -514,7 +521,7 @@ inline bool UnigramDictionary::needsToSkipCurrentNode(const unsigned short c,
}
inline bool UnigramDictionary::existsAdjacentProximityChars(const int inputIndex,
const int inputLength) {
const int inputLength) const {
if (inputIndex < 0 || inputIndex >= inputLength) return false;
const int currentChar = *getInputCharsAt(inputIndex);
const int leftIndex = inputIndex - 1;

7
native/src/unigram_dictionary.h
View File

@ -71,7 +71,8 @@ private:
const int nextLettersSize);
void registerNextLetter(unsigned short c, int *nextLetters, int nextLettersSize);
int calculateFinalFreq(const int inputIndex, const int depth, const int snr, const int skipPos,
const int excessivePos, const int transposedPos, const int freq, const bool sameLength);
const int excessivePos, const int transposedPos, const int freq,
const bool sameLength) const;
void onTerminalWhenUserTypedLengthIsGreaterThanInputLength(unsigned short *word,
const int inputIndex, const int depth, const int snr, int *nextLetters,
const int nextLettersSize, const int skipPos, const int excessivePos,
@ -95,8 +96,8 @@ private:
bool processCurrentNodeForExactMatch(const int firstChildPos,
const int startInputIndex, const int depth, unsigned short *word,
int *newChildPosition, int *newCount, bool *newTerminal, int *newFreq, int *siblingPos);
bool existsAdjacentProximityChars(const int inputIndex, const int inputLength);
inline const int* getInputCharsAt(const int index) {
bool existsAdjacentProximityChars(const int inputIndex, const int inputLength) const;
inline const int* getInputCharsAt(const int index) const {
return mInputCodes + (index * MAX_PROXIMITY_CHARS);
}
const unsigned char *DICT;