feature.h

解码器是基于短语的统计机器翻译系统的核心模块

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

* Begin       : 04/17/2006
* Last Change : 04/17/2006
*
* 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 FEATURE_H
#define FEATURE_H

#include <vector>
#include <iostream>
using namespace std;

class Feature
{

public:

	Feature();

	Feature(int featnum);

	//overload operator
	Feature& operator=(const Feature&right);

	bool operator<(const Feature & right)const;
	
	bool operator>(const Feature & right)const;
	
	bool operator==(const Feature &right)const;
	
	Feature operator+(const Feature& right);
	
	void clear();

	//compute the feature function, Sigma lamda[i] * featfunc[i]
	void ComputeProb(const vector<double> &lamda);

	//show feature function
	void Show(ostream &out, bool isdetail=true);

	vector<double> featfunc;//feature function

    double sigfunc;//sigma lamda[i] * featfunc[i]
	
	double p;//accumulate sigfunc


private:

};
#endif