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物質擴散算法是推薦算法中的一種，是解決信息過載的一個有效途徑

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代碼片段和文件信息 

#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?“math.h“
#include?
#include?
using?namespace?std;

//_DIFFUSE_?_RANDOM_?_HEAT_?_UCF_?_ICF_
//AMAZON?NETFLIX?DELICIOUS?DELICIOUS2?MOVIELENS
/****
#define?_ICF_???//定義各種算法
#define?AMAZON
#define?LENGTH?5
#define?INFILE?“Data/Amazon/train.txt“
#define?OUTDIR?“Result/Recommendation/Amazon/“
****/

#define?_ICF_
#define?AMAZON
#define?LENGTH?1
#define?INFILE?“Data/Test/training.txt“
#define?OUTDIR?“Result/Recommendation/Amazon/“

typedef?set?IDList;
typedef?vector?IntList;
typedef?vector?MovieList;
typedef?vector?UserList;
typedef?map?IDMap;????//?String?to?int
typedef?vector?IDVector;
typedef?vector?DoubleVector;
struct?Edge
{
	string?UID;
	string?PID;
};

struct?Rank
{
	long?int?ID;
	double?Value;
};
struct?RankCompare
{
	bool?operator（）（const?Rank?&?d1?const?Rank?&?d2）???//操作符重載
	{
		return?（?（d1.Value?>?d2.Value）?）;
	};
};
bool?Greater（const?Rank?&?d1?const?Rank?&?d2）
{
	return?d1.Value?};
//typedef?set?PredictionSet;
typedef?vector?PredictionSet;?
typedef?vector?UserRecommendation;

class?Recommender?
{
private:
	long?int?userNumber;
	long?int?movieNumber;
	double?globalSeed;
	IDMap?userMap;
	IDMap?movieMap;
	MovieList?movies;
	UserList?users;
	DoubleVector?userVector;
	DoubleVector?movieVector;
	PredictionSet?preSet;
	IDList?diffuseUsers;
	IDList?diffuseMovies;
	IntList?recommendation;
	UserRecommendation?userRList;
public:
	IDVector?uidVector;
	IDVector?pidVector;
public:
	Recommender（void）;
	~Recommender（void）{};
	
	//?process?the?data
	void?ReadTrainingData（const?char*?fileName）;??//讀取數據
	void?Initial（）;
	long?int?GetUserNumber（）;
	long?int?GetMovieNumber（）;
	IntList?DiffusePrediction（long?int?uid）;	
	IntList?HeatPrediction（long?int?uid）;
	IntList?UCFPrediction（long?int?uid）;
	IntList?ICFPrediction（long?int?uid）;
	void?Run（）;
	UserRecommendation?GetURList（）;
	void?WriteBipartite（char?*?fileName）;
	void?WriteInfo（）;
	void?PrintUsers（）;
	void?PrintMovies（）;
	template?
		void?PrintList（dataType?mList）;
};

Recommender::Recommender（void）
{
	string?s;
	IDVector?uidVector;
	IDVector?pidVector;
	uidVector.push_back（s）;
	pidVector.push_back（s）;
	IDList?temp1;
	UserList?users（1temp1）;
	MovieList?movies（1temp1）;
	
	this->userNumber?=?0;
	this->movieNumber?=?0;
	this->users?=?users;
	this->movies?=?movies;
	this->uidVector?=?uidVector;
	this->pidVector?=?pidVector;
	this->globalSeed?=?0;
}
#if?defined（NETFLIX）?||?defined（MOVIELENS）?||?defined（DELICIOUS2）?||?defined（AMAZON）
void?Recommender::Read

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