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97 lines
2.8 KiB
C++
97 lines
2.8 KiB
C++
/*
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* Copyright (C) 2009 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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#ifndef PINYINIME_INCLUDE_NGRAM_H__
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#define PINYINIME_INCLUDE_NGRAM_H__
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#include <stdio.h>
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#include <stdlib.h>
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#include "./dictdef.h"
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namespace ime_pinyin {
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typedef unsigned char CODEBOOK_TYPE;
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static const unsigned kCodeBookSize = 256;
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class NGram {
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public:
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// The maximum score of a lemma item.
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static const LmaScoreType kMaxScore = 0x3fff;
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// In order to reduce the storage size, the original log value is amplified by
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// kScoreAmplifier, and we use LmaScoreType to store.
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// After this process, an item with a lower score has a higher frequency.
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static const int kLogValueAmplifier = -800;
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// System words' total frequency. It is not the real total frequency, instead,
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// It is only used to adjust system lemmas' scores when the user dictionary's
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// total frequency changes.
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// In this version, frequencies of system lemmas are fixed. We are considering
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// to make them changable in next version.
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static const unsigned kSysDictTotalFreq = 100000000;
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private:
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static NGram* instance_;
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bool initialized_;
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unsigned idx_num_;
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unsigned total_freq_none_sys_;
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// Score compensation for system dictionary lemmas.
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// Because after user adds some user lemmas, the total frequency changes, and
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// we use this value to normalize the score.
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float sys_score_compensation_;
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#ifdef ___BUILD_MODEL___
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double *freq_codes_df_;
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#endif
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LmaScoreType *freq_codes_;
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CODEBOOK_TYPE *lma_freq_idx_;
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public:
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NGram();
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~NGram();
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static NGram& get_instance();
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bool save_ngram(FILE *fp);
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bool load_ngram(FILE *fp);
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// Set the total frequency of all none system dictionaries.
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void set_total_freq_none_sys(unsigned freq_none_sys);
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float get_uni_psb(LemmaIdType lma_id);
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// Convert a probability to score. Actually, the score will be limited to
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// kMaxScore, but at runtime, we also need float expression to get accurate
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// value of the score.
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// After the conversion, a lower score indicates a higher probability of the
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// item.
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static float convert_psb_to_score(double psb);
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#ifdef ___BUILD_MODEL___
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// For constructing the unigram mode model.
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bool build_unigram(LemmaEntry *lemma_arr, unsigned num,
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LemmaIdType next_idx_unused);
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#endif
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};
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}
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#endif // PINYINIME_INCLUDE_NGRAM_H__
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