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Remove code for forgetting curve in Java side. 

Change-Id: I294ed179c642ff52452b5884326c1083477e1bce
main
Keisuke Kuroyanagi 2013-12-13 18:40:58 +09:00
parent 7345059fa6
commit cc8c544ee2
3 changed files with 0 additions and 306 deletions
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6
java/src/com/android/inputmethod/latin/LatinIME.java
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@ -100,7 +100,6 @@ import com.android.inputmethod.latin.utils.RecapitalizeStatus;
import com.android.inputmethod.latin.utils.StringUtils;
import com.android.inputmethod.latin.utils.TargetPackageInfoGetterTask;
import com.android.inputmethod.latin.utils.TextRange;
import com.android.inputmethod.latin.utils.UserHistoryForgettingCurveUtils;
import com.android.inputmethod.research.ResearchLogger;
import java.io.FileDescriptor;
@ -1019,11 +1018,6 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
// Only for debug
mBoostPersonalizationDictionaryForDebug =
currentSettingsValues.mBoostPersonalizationDictionaryForDebug;
if (mBoostPersonalizationDictionaryForDebug) {
UserHistoryForgettingCurveUtils.boostMaxFreqForDebug();
} else {
UserHistoryForgettingCurveUtils.resetMaxFreqForDebug();
}
}
}

242
java/src/com/android/inputmethod/latin/utils/UserHistoryForgettingCurveUtils.java
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@ -1,242 +0,0 @@
/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.inputmethod.latin.utils;
import android.util.Log;
import java.util.concurrent.TimeUnit;
import com.android.inputmethod.annotations.UsedForTesting;
@UsedForTesting
public final class UserHistoryForgettingCurveUtils {
private static final String TAG = UserHistoryForgettingCurveUtils.class.getSimpleName();
private static final boolean DEBUG = false;
private static final int DEFAULT_FC_FREQ = 127;
private static final int BOOSTED_FC_FREQ = 200;
private static int FC_FREQ_MAX = DEFAULT_FC_FREQ;
/* package */ static final int COUNT_MAX = 3;
private static final int FC_LEVEL_MAX = 3;
/* package */ static final int ELAPSED_TIME_MAX = 15;
private static final int ELAPSED_TIME_INTERVAL_HOURS = 6;
private static final long ELAPSED_TIME_INTERVAL_MILLIS =
TimeUnit.HOURS.toMillis(ELAPSED_TIME_INTERVAL_HOURS);
private static final int HALF_LIFE_HOURS = 48;
private static final int MAX_PUSH_ELAPSED = (FC_LEVEL_MAX + 1) * (ELAPSED_TIME_MAX + 1);
public static void boostMaxFreqForDebug() {
FC_FREQ_MAX = BOOSTED_FC_FREQ;
}
public static void resetMaxFreqForDebug() {
FC_FREQ_MAX = DEFAULT_FC_FREQ;
}
private UserHistoryForgettingCurveUtils() {
// This utility class is not publicly instantiable.
}
public static final class ForgettingCurveParams {
private byte mFc;
long mLastTouchedTime = 0;
private final boolean mIsValid;
private void updateLastTouchedTime() {
mLastTouchedTime = System.currentTimeMillis();
}
public ForgettingCurveParams(boolean isValid) {
this(System.currentTimeMillis(), isValid);
}
private ForgettingCurveParams(long now, boolean isValid) {
this(pushCount((byte)0, isValid), now, now, isValid);
}
/** This constructor is called when the user history bigram dictionary is being restored. */
public ForgettingCurveParams(int fc, long now, long last) {
// All words with level >= 1 had been saved.
// Invalid words with level == 0 had been saved.
// Valid words words with level == 0 had *not* been saved.
this(fc, now, last, fcToLevel((byte)fc) > 0);
}
private ForgettingCurveParams(int fc, long now, long last, boolean isValid) {
mIsValid = isValid;
mFc = (byte)fc;
mLastTouchedTime = last;
updateElapsedTime(now);
}
public boolean isValid() {
return mIsValid;
}
public byte getFc() {
updateElapsedTime(System.currentTimeMillis());
return mFc;
}
public int getFrequency() {
updateElapsedTime(System.currentTimeMillis());
return UserHistoryForgettingCurveUtils.fcToFreq(mFc);
}
public int notifyTypedAgainAndGetFrequency() {
updateLastTouchedTime();
// TODO: Check whether this word is valid or not
mFc = pushCount(mFc, false);
return UserHistoryForgettingCurveUtils.fcToFreq(mFc);
}
private void updateElapsedTime(long now) {
final int elapsedTimeCount =
(int)((now - mLastTouchedTime) / ELAPSED_TIME_INTERVAL_MILLIS);
if (elapsedTimeCount <= 0) {
return;
}
if (elapsedTimeCount >= MAX_PUSH_ELAPSED) {
mLastTouchedTime = now;
mFc = 0;
return;
}
for (int i = 0; i < elapsedTimeCount; ++i) {
mLastTouchedTime += ELAPSED_TIME_INTERVAL_MILLIS;
mFc = pushElapsedTime(mFc);
}
}
}
@UsedForTesting
/* package */ static int fcToElapsedTime(byte fc) {
return fc & 0x0F;
}
@UsedForTesting
/* package */ static int fcToCount(byte fc) {
return (fc >> 4) & 0x03;
}
@UsedForTesting
/* package */ static int fcToLevel(byte fc) {
return (fc >> 6) & 0x03;
}
@UsedForTesting
private static int calcFreq(int elapsedTime, int count, int level) {
if (level <= 0) {
// Reserved words, just return -1
return -1;
}
if (count == COUNT_MAX) {
// Temporary promote because it's frequently typed recently
++level;
}
final int et = Math.min(FC_FREQ_MAX, Math.max(0, elapsedTime));
final int l = Math.min(FC_LEVEL_MAX, Math.max(0, level));
return MathUtils.SCORE_TABLE[l - 1][et];
}
/* pakcage */ static byte calcFc(int elapsedTime, int count, int level) {
final int et = Math.min(FC_FREQ_MAX, Math.max(0, elapsedTime));
final int c = Math.min(COUNT_MAX, Math.max(0, count));
final int l = Math.min(FC_LEVEL_MAX, Math.max(0, level));
return (byte)(et | (c << 4) | (l << 6));
}
public static int fcToFreq(byte fc) {
final int elapsedTime = fcToElapsedTime(fc);
final int count = fcToCount(fc);
final int level = fcToLevel(fc);
return calcFreq(elapsedTime, count, level);
}
@UsedForTesting
public static byte pushElapsedTime(byte fc) {
int elapsedTime = fcToElapsedTime(fc);
int count = fcToCount(fc);
int level = fcToLevel(fc);
if (elapsedTime >= ELAPSED_TIME_MAX) {
// Downgrade level
elapsedTime = 0;
count = COUNT_MAX;
--level;
} else {
++elapsedTime;
}
return calcFc(elapsedTime, count, level);
}
@UsedForTesting
public static byte pushCount(byte fc, boolean isValid) {
final int elapsedTime = fcToElapsedTime(fc);
int count = fcToCount(fc);
int level = fcToLevel(fc);
if ((elapsedTime == 0 && count >= COUNT_MAX) || (isValid && level == 0)) {
// Upgrade level
++level;
count = 0;
if (DEBUG) {
Log.d(TAG, "Upgrade level.");
}
} else {
++count;
}
return calcFc(0, count, level);
}
// TODO: isValid should be false for a word whose frequency is 0,
// or that is not in the dictionary.
/**
* Check wheather we should save the bigram to the SQL DB or not
*/
public static boolean needsToSave(byte fc, boolean isValid, boolean addLevel0Bigram) {
int level = fcToLevel(fc);
if (level == 0) {
if (isValid || !addLevel0Bigram) {
return false;
}
}
final int elapsedTime = fcToElapsedTime(fc);
return (elapsedTime < ELAPSED_TIME_MAX - 1 || level > 0);
}
private static final class MathUtils {
public static final int[][] SCORE_TABLE = new int[FC_LEVEL_MAX][ELAPSED_TIME_MAX + 1];
static {
for (int i = 0; i < FC_LEVEL_MAX; ++i) {
final float initialFreq;
if (i >= 2) {
initialFreq = FC_FREQ_MAX;
} else if (i == 1) {
initialFreq = FC_FREQ_MAX / 2;
} else if (i == 0) {
initialFreq = FC_FREQ_MAX / 4;
} else {
continue;
}
for (int j = 0; j < ELAPSED_TIME_MAX; ++j) {
final float elapsedHours = j * ELAPSED_TIME_INTERVAL_HOURS;
final float freq = initialFreq
* (float)Math.pow(initialFreq, elapsedHours / HALF_LIFE_HOURS);
final int intFreq = Math.min(FC_FREQ_MAX, Math.max(0, (int)freq));
SCORE_TABLE[i][j] = intFreq;
}
}
}
}
}

58
tests/src/com/android/inputmethod/latin/utils/ForgettingCurveTests.java
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@ -1,58 +0,0 @@
/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.inputmethod.latin.utils;
import android.test.AndroidTestCase;
import android.test.suitebuilder.annotation.SmallTest;
@SmallTest
public class ForgettingCurveTests extends AndroidTestCase {
public void testFcToFreq() {
for (int i = 0; i < Byte.MAX_VALUE; ++i) {
final byte fc = (byte)i;
final int e = UserHistoryForgettingCurveUtils.fcToElapsedTime(fc);
final int c = UserHistoryForgettingCurveUtils.fcToCount(fc);
final int l = UserHistoryForgettingCurveUtils.fcToLevel(fc);
final byte fc2 = UserHistoryForgettingCurveUtils.calcFc(e, c, l);
assertEquals(fc, fc2);
}
byte fc = 0;
int l;
for (int i = 0; i < 4; ++i) {
for (int j = 0; j < (UserHistoryForgettingCurveUtils.COUNT_MAX + 1); ++j) {
fc = UserHistoryForgettingCurveUtils.pushCount(fc, true);
}
l = UserHistoryForgettingCurveUtils.fcToLevel(fc);
assertEquals(l, Math.max(1, Math.min(i + 1, 3)));
}
fc = 0;
for (int i = 0; i < 4; ++i) {
for (int j = 0; j < (UserHistoryForgettingCurveUtils.COUNT_MAX + 1); ++j) {
fc = UserHistoryForgettingCurveUtils.pushCount(fc, false);
}
l = UserHistoryForgettingCurveUtils.fcToLevel(fc);
assertEquals(l, Math.min(i + 1, 3));
}
for (int i = 0; i < 4; ++i) {
for (int j = 0; j < (UserHistoryForgettingCurveUtils.ELAPSED_TIME_MAX + 1); ++j) {
fc = UserHistoryForgettingCurveUtils.pushElapsedTime(fc);
}
l = UserHistoryForgettingCurveUtils.fcToLevel(fc);
assertEquals(l, Math.max(0, 2 - i));
}
}
}