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/*
* 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_DECAYING_UTILS_H
#define LATINIME_DECAYING_UTILS_H
#include "defines.h"
namespace latinime {
// TODO: Check the elapsed time and decrease the probability depending on the time. Time field is
// required to introduced to each terminal PtNode and bigram entry.
// TODO: Quit using bigram probability to indicate the delta.
// TODO: Quit using bigram probability delta.
class DecayingUtils {
public:
static const int MAX_UNIGRAM_COUNT;
static const int MAX_UNIGRAM_COUNT_AFTER_GC;
static const int MAX_BIGRAM_COUNT;
static const int MAX_BIGRAM_COUNT_AFTER_GC;
static int getProbability(const int encodedUnigramProbability,
const int encodedBigramProbabilityDelta);
static int getUpdatedUnigramProbability(const int originalEncodedProbability,
const int newProbability);
static int getUpdatedBigramProbabilityDelta(const int originalEncodedProbabilityDelta,
const int newProbability);
static int isValidUnigram(const int encodedUnigramProbability);
static int isValidBigram(const int encodedProbabilityDelta);
static int getUnigramProbabilityToSave(const int encodedProbability);
static int getBigramProbabilityDeltaToSave(const int encodedProbabilityDelta);
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(DecayingUtils);
static const int MAX_COMPUTED_PROBABILITY;
static const int MAX_UNIGRAM_PROBABILITY;
static const int MIN_VALID_UNIGRAM_PROBABILITY;
static const int UNIGRAM_PROBABILITY_STEP;
static const int MAX_BIGRAM_PROBABILITY_DELTA;
static const int MIN_VALID_BIGRAM_PROBABILITY_DELTA;
static const int BIGRAM_PROBABILITY_DELTA_STEP;
static int decodeUnigramProbability(const int encodedProbability);
static int decodeBigramProbabilityDelta(const int encodedProbability);
static int getDecayedProbability(const int rawProbability);
};
} // namespace latinime
#endif /* LATINIME_DECAYING_UTILS_H */
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