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樸素貝葉斯算法（C語言實現(xiàn)）（來自網(wǎng)絡(luò)）

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代碼片段和文件信息 


#include?
#include?
#include?
#include?
#include?
#include?
#include?

using?namespace?std;

//Attribute-Class?relation?table
class?Class{
public:
??Class（）;
??//continue?attribute
??double?mu?sigma;
??vector?vals;
??//discrete?attribute
??map?val_count;
};

Class::Class（）{
??mu=sigma=0;
}

class?Attribute{
public:
??bool?isContinue;
??vector?classes;
};

class?NaiveBayesian{
public:
??int?D;
??vector?attr;
??map?classes;
??vector?class_count;

??int?read_attribute（char*?attr_file）;
??int?train（char*?train_file）;
??int?classify（）;

??int?print（）;
};

int?NaiveBayesian::classify（）{
??string?temp;
??char?comma;
??double?d_val;?int?i_val;
??Class*?cp;
??vector?pri;
??double?pi=acos（-1.0）;
??map::iterator?iter;
??map::iterator?iter2?idx;
??int?count;
??double?tmp_pri;

??for（;cin>>temp;）{
????pri.clear（）;
????for（int?i=0;?i??????pri.push_back（1.0）;
????}

????istringstream?ss（temp）;
????//ss.str（temp）;
????//cout<????for（int?i=0;?i??????if（attr[i].isContinue）{
	//continue?value
	if（!（ss>>d_val））return?-1;
	for（int?j=0;?j	??cp=&attr[i].classes[j];
	??tmp_pri=exp（-pow（d_val-cp->mu?2.0）/（2.0*pow（cp->sigma?2.0）））/（cp->sigma*sqrt（2.0*pi））;
	??pri[j]*=tmp_pri;

	??//cout<	}
??????}else{
	//discrete?value
	if（!（ss>>i_val））return?-1;
	for（int?j=0;?j	??cp=&attr[i].classes[j];
	??iter=cp->val_count.find（i_val）;
	??if（iter==cp->val_count.end（））count=0;
	??else?count=iter->second;
	??tmp_pri=（（double）count）/（（double）class_count[j]）;
	??pri[j]*=tmp_pri;

	??//cout<	}
??????}
??????if（i	ss>>comma;
????}

????/*
????for（int?i=0;?i??????cout<????*/

????iter2=idx=classes.begin（）;
????for（iter2++;?iter2!=classes.end（）;?iter2++）{
??????if（pri[iter2->second]*class_count[iter2->second]>pri[idx->second]*class_count[idx->second]）
	idx=iter2;
????}
????cout<first<<‘?‘<second]<????//cout<??}

??return?1;
}

int?NaiveBayesian::print（）{
??for（int?i=0;?i????for（int?j=0;?j??????cout<??????Class*?cp=&attr[i].classes[j];
??????if（attr[i].isContinue）{
	cout<mu<<‘?‘<sigma<??????}else{
	for（map::iterator?iter=cp->val_count.begin（）;?
	????iter!=cp->val_count.end（）;?iter++）{
	??cout<first<<“::“<second<	}
??????}
??????cout<????}
??}

??return?1;
}

int?NaiveBayesian::train（char*?train_file）{
??fstream?fstr;
??fstr.open（train_file?fstream::in）;
??if（!fstr.is_open（））
????return?-1;

??char?comma;
??string?class_str;
??string?temp;
??int?i_val;?double?d_val;
??Class*?cp;
??map::iterator?iter;
??for（D=0;?fstr>>temp;?D++）{
????class_str=temp.substr（te

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2010-02-26?21:02??NaiveBayesian\
?????目錄???????????0??2010-02-26?21:02??NaiveBayesian\adult\
?????文件?????????208??2009-06-05?20:57??NaiveBayesian\adult\adult.attr
?????文件?????1359888??2009-06-05?21:53??NaiveBayesian\adult\adult_p.data
?????文件??????697878??2009-06-06?22:33??NaiveBayesian\adult\adult_p.test
?????目錄???????????0??2010-02-26?21:02??NaiveBayesian\data_proc\
?????文件?????????208??2009-06-05?20:57??NaiveBayesian\data_proc\adult.attr
?????文件?????3974305??2009-06-05?20:34??NaiveBayesian\data_proc\adult.data
?????文件????????5262??2009-06-05?20:55??NaiveBayesian\data_proc\adult.names
?????文件?????2003132??2009-06-05?21:13??NaiveBayesian\data_proc\adult.test
?????文件?????1359888??2009-06-05?21:53??NaiveBayesian\data_proc\adult_p.data
?????文件??????697878??2009-06-06?22:33??NaiveBayesian\data_proc\adult_p.test
?????文件??????????55??2009-06-05?21:26??NaiveBayesian\data_proc\Makefile
?????文件??????209696??2009-06-05?21:53??NaiveBayesian\data_proc\proc
?????文件????????1158??2009-06-05?21:53??NaiveBayesian\data_proc\proc.cpp
?????目錄???????????0??2010-02-26?21:02??NaiveBayesian\error_rate\
?????文件??????697878??2009-06-06?22:33??NaiveBayesian\error_rate\adult_p.test
?????文件???????40136??2009-06-08?12:11??NaiveBayesian\error_rate\error
?????文件?????????612??2009-06-08?12:10??NaiveBayesian\error_rate\error.cpp
?????文件??????????60??2009-06-08?12:11??NaiveBayesian\error_rate\Makefile
?????文件??????288743??2009-06-24?22:38??NaiveBayesian\error_rate\result_adult
?????目錄???????????0??2010-02-26?21:02??NaiveBayesian\Iris\
?????文件?????????116??2009-06-03?18:49??NaiveBayesian\Iris\Iris.attr
?????文件????????4551??2009-06-03?15:14??NaiveBayesian\Iris\iris.data
?????文件????????2998??2009-06-03?15:14??NaiveBayesian\Iris\iris.names
?????文件?????????106??2009-06-03?18:52??NaiveBayesian\Makefile
?????文件??????315267??2009-06-24?22:32??NaiveBayesian\naive_bayesian
?????文件????????4723??2009-06-24?22:31??NaiveBayesian\naive_bayesian.cpp
?????文件??????288743??2009-06-06?22:44??NaiveBayesian\result_adult
?????文件????????3481??2009-06-05?20:27??NaiveBayesian\result_Iris
?????文件??????????47??2009-06-04?14:41??NaiveBayesian\test.attr
............此處省略2個文件信息

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