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https://github.com/yanyiwu/cppjieba.git
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347 lines
11 KiB
C++
347 lines
11 KiB
C++
#ifndef CPPJIBEA_HMMSEGMENT_H
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#define CPPJIBEA_HMMSEGMENT_H
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#include <iostream>
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#include <fstream>
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#include <memory.h>
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#include <cassert>
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#include "Limonp/str_functs.hpp"
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#include "Limonp/logger.hpp"
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#include "TransCode.hpp"
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#include "ISegment.hpp"
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#include "SegmentBase.hpp"
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#include "Trie.hpp"
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namespace CppJieba
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{
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using namespace Limonp;
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typedef unordered_map<uint16_t, double> EmitProbMap;
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class HMMSegment: public SegmentBase
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{
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public:
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/*
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* STATUS:
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* 0:B, 1:E, 2:M, 3:S
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* */
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enum {B = 0, E = 1, M = 2, S = 3, STATUS_SUM = 4};
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private:
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char _statMap[STATUS_SUM];
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double _startProb[STATUS_SUM];
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double _transProb[STATUS_SUM][STATUS_SUM];
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EmitProbMap _emitProbB;
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EmitProbMap _emitProbE;
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EmitProbMap _emitProbM;
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EmitProbMap _emitProbS;
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vector<EmitProbMap* > _emitProbVec;
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public:
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HMMSegment(){_setInitFlag(false);}
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explicit HMMSegment(const string& filePath)
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{
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_setInitFlag(init(filePath));
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}
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virtual ~HMMSegment(){}
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public:
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bool init(const string& filePath)
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{
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if(_getInitFlag())
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{
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LogError("inited already.");
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return false;
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}
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memset(_startProb, 0, sizeof(_startProb));
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memset(_transProb, 0, sizeof(_transProb));
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_statMap[0] = 'B';
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_statMap[1] = 'E';
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_statMap[2] = 'M';
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_statMap[3] = 'S';
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_emitProbVec.push_back(&_emitProbB);
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_emitProbVec.push_back(&_emitProbE);
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_emitProbVec.push_back(&_emitProbM);
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_emitProbVec.push_back(&_emitProbS);
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if(!_setInitFlag(_loadModel(filePath.c_str())))
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{
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LogError("_loadModel(%s) failed.", filePath.c_str());
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return false;
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}
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LogInfo("HMMSegment init(%s) ok.", filePath.c_str());
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return true;
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}
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public:
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using SegmentBase::cut;
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bool cut(Unicode::const_iterator begin, Unicode::const_iterator end, vector<Unicode>& res)const
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{
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if(!_getInitFlag())
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{
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LogError("not inited.");
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return false;
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}
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vector<size_t> status;
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if(!_viterbi(begin, end, status))
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{
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LogError("_viterbi failed.");
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return false;
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}
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Unicode::const_iterator left = begin;
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Unicode::const_iterator right;
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for(size_t i =0; i< status.size(); i++)
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{
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if(status[i] % 2) //if(E == status[i] || S == status[i])
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{
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right = begin + i + 1;
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res.push_back(Unicode(left, right));
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left = right;
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}
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}
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return true;
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}
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public:
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virtual bool cut(Unicode::const_iterator begin, Unicode::const_iterator end, vector<string>& res)const
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{
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assert(_getInitFlag());
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if(begin == end)
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{
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return false;
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}
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vector<Unicode> words;
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if(!cut(begin, end, words))
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{
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return false;
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}
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string tmp;
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for(size_t i = 0; i < words.size(); i++)
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{
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if(TransCode::encode(words[i], tmp))
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{
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res.push_back(tmp);
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}
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}
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return true;
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}
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private:
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bool _viterbi(Unicode::const_iterator begin, Unicode::const_iterator end, vector<size_t>& status)const
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{
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if(begin == end)
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{
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return false;
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}
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size_t Y = STATUS_SUM;
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size_t X = end - begin;
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size_t XYSize = X * Y;
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int * path;
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double * weight;
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size_t now, old, stat;
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double tmp, endE, endS;
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try
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{
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path = new int [XYSize];
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weight = new double [XYSize];
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}
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catch(const std::bad_alloc&)
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{
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LogError("bad_alloc");
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return false;
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}
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if(NULL == path || NULL == weight)
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{
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LogError("bad_alloc");
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return false;
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}
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//start
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for(size_t y = 0; y < Y; y++)
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{
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weight[0 + y * X] = _startProb[y] + _getEmitProb(_emitProbVec[y], *begin, MIN_DOUBLE);
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path[0 + y * X] = -1;
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}
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//process
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//for(; begin != end; begin++)
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for(size_t x = 1; x < X; x++)
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{
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for(size_t y = 0; y < Y; y++)
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{
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now = x + y*X;
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weight[now] = MIN_DOUBLE;
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path[now] = E; // warning
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for(size_t preY = 0; preY < Y; preY++)
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{
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old = x - 1 + preY * X;
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tmp = weight[old] + _transProb[preY][y] + _getEmitProb(_emitProbVec[y], *(begin+x), MIN_DOUBLE);
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if(tmp > weight[now])
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{
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weight[now] = tmp;
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path[now] = preY;
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}
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}
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}
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}
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endE = weight[X-1+E*X];
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endS = weight[X-1+S*X];
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stat = 0;
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if(endE > endS)
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{
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stat = E;
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}
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else
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{
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stat = S;
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}
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status.assign(X, 0);
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for(int x = X -1 ; x >= 0; x--)
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{
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status[x] = stat;
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stat = path[x + stat*X];
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}
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delete [] path;
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delete [] weight;
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return true;
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}
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bool _loadModel(const char* const filePath)
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{
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LogDebug("loadModel [%s] start ...", filePath);
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ifstream ifile(filePath);
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string line;
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vector<string> tmp;
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vector<string> tmp2;
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//load _startProb
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if(!_getLine(ifile, line))
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{
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return false;
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}
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split(line, tmp, " ");
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if(tmp.size() != STATUS_SUM)
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{
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LogError("start_p illegal");
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return false;
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}
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for(size_t j = 0; j< tmp.size(); j++)
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{
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_startProb[j] = atof(tmp[j].c_str());
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//cout<<_startProb[j]<<endl;
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}
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//load _transProb
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for(size_t i = 0; i < STATUS_SUM; i++)
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{
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if(!_getLine(ifile, line))
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{
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return false;
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}
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split(line, tmp, " ");
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if(tmp.size() != STATUS_SUM)
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{
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LogError("trans_p illegal");
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return false;
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}
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for(size_t j =0; j < STATUS_SUM; j++)
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{
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_transProb[i][j] = atof(tmp[j].c_str());
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//cout<<_transProb[i][j]<<endl;
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}
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}
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//load _emitProbB
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if(!_getLine(ifile, line) || !_loadEmitProb(line, _emitProbB))
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{
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return false;
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}
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//load _emitProbE
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if(!_getLine(ifile, line) || !_loadEmitProb(line, _emitProbE))
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{
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return false;
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}
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//load _emitProbM
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if(!_getLine(ifile, line) || !_loadEmitProb(line, _emitProbM))
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{
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return false;
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}
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//load _emitProbS
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if(!_getLine(ifile, line) || !_loadEmitProb(line, _emitProbS))
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{
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return false;
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}
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LogDebug("loadModel [%s] end.", filePath);
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return true;
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}
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bool _getLine(ifstream& ifile, string& line)
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{
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while(getline(ifile, line))
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{
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trim(line);
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if(line.empty())
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{
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continue;
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}
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if(startsWith(line, "#"))
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{
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continue;
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}
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return true;
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}
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return false;
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}
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bool _loadEmitProb(const string& line, EmitProbMap& mp)
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{
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if(line.empty())
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{
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return false;
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}
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vector<string> tmp, tmp2;
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uint16_t unico = 0;
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split(line, tmp, ",");
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for(size_t i = 0; i < tmp.size(); i++)
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{
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split(tmp[i], tmp2, ":");
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if(2 != tmp2.size())
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{
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LogError("_emitProb illegal.");
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return false;
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}
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if(!_decodeOne(tmp2[0], unico))
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{
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LogError("TransCode failed.");
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return false;
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}
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mp[unico] = atof(tmp2[1].c_str());
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}
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return true;
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}
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bool _decodeOne(const string& str, uint16_t& res)
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{
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Unicode ui16;
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if(!TransCode::decode(str, ui16) || ui16.size() != 1)
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{
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return false;
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}
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res = ui16[0];
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return true;
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}
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double _getEmitProb(const EmitProbMap* ptMp, uint16_t key, double defVal)const
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{
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EmitProbMap::const_iterator cit = ptMp->find(key);
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if(cit == ptMp->end())
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{
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return defVal;
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}
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return cit->second;
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}
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};
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}
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#endif
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