113 lines
4.1 KiB
C++
113 lines
4.1 KiB
C++
/*
|
|
* Copyright (C) 2013, 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.
|
|
*/
|
|
|
|
#ifndef LATINIME_FORGETTING_CURVE_UTILS_H
|
|
#define LATINIME_FORGETTING_CURVE_UTILS_H
|
|
|
|
#include <vector>
|
|
|
|
#include "defines.h"
|
|
#include "dictionary/property/historical_info.h"
|
|
#include "dictionary/utils/entry_counters.h"
|
|
|
|
namespace latinime {
|
|
|
|
class HeaderPolicy;
|
|
|
|
class ForgettingCurveUtils {
|
|
public:
|
|
static const HistoricalInfo createUpdatedHistoricalInfo(
|
|
const HistoricalInfo *const originalHistoricalInfo, const int newProbability,
|
|
const HistoricalInfo *const newHistoricalInfo, const HeaderPolicy *const headerPolicy);
|
|
|
|
static const HistoricalInfo createHistoricalInfoToSave(
|
|
const HistoricalInfo *const originalHistoricalInfo,
|
|
const HeaderPolicy *const headerPolicy);
|
|
|
|
static int decodeProbability(const HistoricalInfo *const historicalInfo,
|
|
const HeaderPolicy *const headerPolicy);
|
|
|
|
static bool needsToKeep(const HistoricalInfo *const historicalInfo,
|
|
const HeaderPolicy *const headerPolicy);
|
|
|
|
static bool needsToDecay(const bool mindsBlockByDecay, const EntryCounts &entryCounters,
|
|
const HeaderPolicy *const headerPolicy);
|
|
|
|
// TODO: Improve probability computation method and remove this.
|
|
static int getProbabilityBiasForNgram(const int n) {
|
|
return (n - 1) * MULTIPLIER_TWO_IN_PROBABILITY_SCALE;
|
|
}
|
|
|
|
AK_FORCE_INLINE static int getEntryCountHardLimit(const int maxEntryCount) {
|
|
return static_cast<int>(static_cast<float>(maxEntryCount)
|
|
* ENTRY_COUNT_HARD_LIMIT_WEIGHT);
|
|
}
|
|
|
|
private:
|
|
DISALLOW_IMPLICIT_CONSTRUCTORS(ForgettingCurveUtils);
|
|
|
|
class ProbabilityTable {
|
|
public:
|
|
ProbabilityTable();
|
|
|
|
int getProbability(const int tableId, const int level,
|
|
const int elapsedTimeStepCount) const {
|
|
return mTables[tableId][level][elapsedTimeStepCount];
|
|
}
|
|
|
|
private:
|
|
DISALLOW_COPY_AND_ASSIGN(ProbabilityTable);
|
|
|
|
static const int PROBABILITY_TABLE_COUNT;
|
|
static const int WEAK_PROBABILITY_TABLE_ID;
|
|
static const int MODEST_PROBABILITY_TABLE_ID;
|
|
static const int STRONG_PROBABILITY_TABLE_ID;
|
|
static const int AGGRESSIVE_PROBABILITY_TABLE_ID;
|
|
|
|
static const int WEAK_MAX_PROBABILITY;
|
|
static const int MODEST_BASE_PROBABILITY;
|
|
static const int STRONG_BASE_PROBABILITY;
|
|
static const int AGGRESSIVE_BASE_PROBABILITY;
|
|
|
|
std::vector<std::vector<std::vector<int>>> mTables;
|
|
|
|
static int getBaseProbabilityForLevel(const int tableId, const int level);
|
|
};
|
|
|
|
static const int MULTIPLIER_TWO_IN_PROBABILITY_SCALE;
|
|
static const int DECAY_INTERVAL_SECONDS;
|
|
|
|
static const int MAX_LEVEL;
|
|
static const int MIN_VISIBLE_LEVEL;
|
|
static const int MAX_ELAPSED_TIME_STEP_COUNT;
|
|
static const int DISCARD_LEVEL_ZERO_ENTRY_TIME_STEP_COUNT_THRESHOLD;
|
|
static const int OCCURRENCES_TO_RAISE_THE_LEVEL;
|
|
static const int DURATION_TO_LOWER_THE_LEVEL_IN_SECONDS;
|
|
|
|
static const float ENTRY_COUNT_HARD_LIMIT_WEIGHT;
|
|
|
|
static const ProbabilityTable sProbabilityTable;
|
|
|
|
static int backoff(const int unigramProbability);
|
|
static int getElapsedTimeStepCount(const int timestamp, const int durationToLevelDown);
|
|
static int clampToVisibleEntryLevelRange(const int level);
|
|
static int clampToValidLevelRange(const int level);
|
|
static int clampToValidCountRange(const int count, const HeaderPolicy *const headerPolicy);
|
|
static int clampToValidTimeStepCountRange(const int timeStepCount);
|
|
};
|
|
} // namespace latinime
|
|
#endif /* LATINIME_FORGETTING_CURVE_UTILS_H */
|