languagemodel.h

解码器是基于短语的统计机器翻译系统的核心模块

/*
* LanguageModel.h  -  Language Model
*
* Copyright (C) 2006 by Zhongjun He <[e-mail]> 
Multilingual Interaction Technology and Evaluation Laboratory, ICT, CAS

* Begin       : 04/13/2006
* Last Change : 04/13/2006
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/
#ifndef LANGUAGE_MODEL_H
#define LANGUAGE_MODEL_H

#include <string>
#include "lmsridll.h"

using namespace std;

class LanguageModel
{
public:

	// construction function
	LanguageModel();

	// destruction function
	~LanguageModel();

	// initialization 
	void init(const char* fileName, int lmngram);
	
	// return the Language Model probability log(p), default is 3-gram
	double getLMProb(const string &context, const string &word, int n = 3);

private:

	void *lmPtr;   // LM pointer
	
	// return LM probability log(p)
	double getProb(const string &context, const string &word);
};

#endif