關(guān)于C++實(shí)現(xiàn)的BP神經(jīng)網(wǎng)絡(luò)（代碼）
#pragma hdrstop
#include <stdio.h>
#include <iostream.h>
const A=30.0;
const B=10.0;
const MAX=500; //最大訓(xùn)練次數(shù)
const COEF=0.0035; //網(wǎng)絡(luò)的學(xué)習(xí)效率
const BCOEF=0.001;//網(wǎng)絡(luò)的閥值調(diào)整效率
const ERROR=0.002 ; // 網(wǎng)絡(luò)訓(xùn)練中的允許誤差
const ACCURACY=0.0005;//網(wǎng)絡(luò)要求精度
double sample[41][4]={{0,0,0,0},{5,1,4,19.020},{5,3,3,14.150},
{5,5,2,14.360},{5,3,3,14.150},{5,3,2,15.390},
{5,3,2,15.390},{5,5,1,19.680},{5,1,2,21.060},
{5,3,3,14.150},{5,5,4,12.680},{5,5,2,14.360},
{5,1,3,19.610},{5,3,4,13.650},{5,5,5,12.430},
{5,1,4,19.020},{5,1,4,19.020},{5,3,5,13.390},
{5,5,4,12.680},{5,1,3,19.610},{5,3,2,15.390},
{1,3,1,11.110},{1,5,2,6.521},{1,1,3,10.190},
{1,3,4,6.043},{1,5,5,5.242},{1,5,3,5.724},
{1,1,4,9.766},{1,3,5,5.870},{1,5,4,5.406},
{1,1,3,10.190},{1,1,5,9.545},{1,3,4,6.043},
{1,5,3,5.724},{1,1,2,11.250},{1,3,1,11.110},
{1,3,3,6.380},{1,5,2,6.521},{1,1,1,16.000},
{1,3,2,7.219},{1,5,3,5.724}};
double w[4][10][10],wc[4][10][10],b[4][10],bc[4][10];
double o[4][10],netin[4][10],d[4][10],differ;//單個(gè)樣本的誤差
double is; //全體樣本均方差
int count,a;
void netout(int m, int n);//計(jì)算網(wǎng)絡(luò)隱含層和輸出層的輸出
void calculd(int m,int n); //計(jì)算網(wǎng)絡(luò)的反向傳播誤差
void calcalwc(int m,int n);//計(jì)算網(wǎng)絡(luò)權(quán)值的調(diào)整量
void calcaulbc(int m,int n); //計(jì)算網(wǎng)絡(luò)閥值的調(diào)整量
void changew(int m,int n); //調(diào)整網(wǎng)絡(luò)權(quán)值
void changeb(int m,int n);//調(diào)整網(wǎng)絡(luò)閥值
void clearwc(int m,int n);//清除網(wǎng)絡(luò)權(quán)值變化量wc
void clearbc(int m,int n);//清除網(wǎng)絡(luò)閥值變化量bc
void initialw(void);//初始化NN網(wǎng)絡(luò)權(quán)值W
void initialb(void); //初始化NN網(wǎng)絡(luò)閥值
void calculdiffer(void);//計(jì)算NN網(wǎng)絡(luò)單個(gè)樣本誤差
void calculis(void);//計(jì)算NN網(wǎng)絡(luò)全體樣本誤差
void trainNN(void);//訓(xùn)練NN網(wǎng)絡(luò)
/*計(jì)算NN網(wǎng)絡(luò)隱含層和輸出層的輸出 */
void netout(int m,int n)
{
int i,j,k;
//隱含層各節(jié)點(diǎn)的的輸出
for (j=1,i=2;j<=m;j++) //m為隱含層節(jié)點(diǎn)個(gè)數(shù)
{
netin[i][j]=0.0;
for(k=1;k<=3;k++)//隱含層的每個(gè)節(jié)點(diǎn)均有三個(gè)輸入變量
netin[i][j]=netin[i][j]+o[i-1][k]*w[i][k][j];
netin[i][j]=netin[i][j]-b[i][j];
o[i][j]=A/(1+exp(-netin[i][j]/B));
}
//輸出層各節(jié)點(diǎn)的輸出
for (j=1,i=3;j<=n;j++)
{
netin[i][j]=0.0;
for (k=1;k<=m;k++)
netin[i][j]=netin[i][j]+o[i-1][k]*w[i][k][j];
netin[i][j]=netin[i][j]-b[i][j];
o[i][j]=A/(1+exp(-netin[i][j]/B)) ;
}
}
/*計(jì)算NN網(wǎng)絡(luò)的反向傳播誤差*/
void calculd(int m,int n)
{
int i,j,k;
double t;
a=count-1;
d[3][1]=(o[3][1]-sample[a][3])*(A/B)*exp(-netin[3][1]/B)/pow(1+exp(-netin[3][1]/B),2);
//隱含層的誤差
for (j=1,i=2;j<=m;j++)
{
t=0.00;
for (k=1;k<=n;k++)
t=t+w[i+1][j][k]*d[i+1][k];
d[i][j]=t*(A/B)*exp(-netin[i][j]/B)/pow(1+exp(-netin[i][j]/B),2);
}
}
/*計(jì)算網(wǎng)絡(luò)權(quán)值W的調(diào)整量*/
void calculwc(int m,int n)
{
int i,j,k;
// 輸出層（第三層）與隱含層（第二層）之間的連接權(quán)值的調(diào)整
for (i=1,k=3;i<=m;i++)
{
for (j=1;j<=n;j++)
{
wc[k][i][j]=-COEF*d[k][j]*o[k-1][i]+0.5*wc[k][i][j];
}
// printf("n");
}
//隱含層與輸入層之間的連接權(quán)值的調(diào)整
for (i=1,k=2;i<=m;i++)
{
for (j=1;j<=m;j++)
{
wc[k][i][j]=-COEF*d[k][j]*o[k-1][i]+0.5*wc[k][i][j];
}
// printf("n");
}
}
/*計(jì)算網(wǎng)絡(luò)閥值的調(diào)整量*/
void calculbc(int m,int n)
{
int j;
for (j=1;j<=m;j++)
{
bc[2][j]=BCOEF*d[2][j];
}
for (j=1;j<=n;j++)
{
bc[3][j]=BCOEF*d[3][j];
}
}
/*調(diào)整網(wǎng)絡(luò)權(quán)值*/
void changw(int m,int n)
{
int i,j;
for (i=1;i<=3;i++)
for (j=1;j<=m;j++)
{
w[2][i][j]=0.9*w[2][i][j]+wc[2][i][j];
//為了保證系統(tǒng)有較好的魯棒性，計(jì)算權(quán)值時(shí)乘慣性系數(shù)0.9
printf("w[2][%d][%d]=%fn",i,j,w[2][i][j]);
}
for (i=1;i<=m;i++)
for (j=1;j<=n;j++)
{
w[3][i][j]=0.9*w[3][i][j]+wc[3][i][j];
printf("w[3][%d][%d]=%fn",i,j,w[3][i][j]);
}
}
/*調(diào)整網(wǎng)絡(luò)閥值*/
void changb(int m,int n)
{
int j;
for (j=1;j<=m;j++)
b[2][j]=b[2][j]+bc[2][j];
for (j=1;j<=n;j++)
b[3][j]=b[3][j]+bc[3][j];
}
/*清除網(wǎng)絡(luò)權(quán)值變化量wc*/
void clearwc(void)
{
for (int i=0;i<4;i++)
for (int j=0;j<10;j++)
for (int k=0;k<10;k++)
wc[i][j][k]=0.00;
}
/*清除網(wǎng)絡(luò)閥值變化量*/
void clearbc(void)
{
for (int i=0;i<4;i++)
for (int j=0;j<10;j++)
bc[i][j]=0.00;
}
/*初始化網(wǎng)絡(luò)權(quán)值W*/
void initialw(void)
{
int i,j,k,x;
double weight;
for (i=0;i<4;i++)
for (j=0;j<10;j++)
for (k=0;k<10;k++)
{
randomize();
x=100+random(400);
weight=(double)x/5000.00;
w[i][j][k]=weight;
}
}
/*初始化網(wǎng)絡(luò)閥值*/
void initialb(void)
{
int i,j,x;
double fazhi;
for (i=0;i<4;i++)
for (j=0;j<10;j++)
{
randomize();
for (int k=0;k<12;k++)
{
x=100+random(400);
}
fazhi=(double)x/50000.00;
b[i][j]=fazhi;
}
}
/*計(jì)算網(wǎng)絡(luò)單個(gè)樣本誤差*/
void calculdiffer(void)
{
a=count-1;
differ=0.5*(o[3][1]-sample[a][3])*(o[3][1]-sample[a][3]);
}
void calculis(void)
{
int i;
is=0.0;
for (i=0;i<=19;i++)
{
o[1][1]=sample[i][0];
o[1][2]=sample[i][1];
o[1][3]=sample[i][2];
netout(8,1);
is=is+(o[3][1]-sample[i][3])*(o[3][1]-sample[i][3]);
}
is=is/20;
}
/*訓(xùn)練網(wǎng)絡(luò)*/
void trainNN(void)
{
long int time;
int i,x[4];
initialw();
initialb();
for (time=1;time<=MAX;time++)
{
count=0;
while(count<=40)
{
o[1][1]=sample[count][0];
o[1][2]=sample[count][1];
o[1][3]=sample[count][2];
count=count+1;
clearwc();
clearbc();
netout(8,1);
calculdiffer();
while(differ>ERROR)
{
calculd(8,1);
calculwc(8,1);
calculbc(8,1);
changw(8,1);
changb(8,1);
netout(8,1);
calculdiffer();
}
}
printf("This is %d times training NN...n",time);
calculis();
printf("is==%fn",is);
if (is<ACCURACY) break;
}
}
//---------------------------------------------------------------------------
#pragma argsused
int main(int argc, char* argv[])
{
double result;
int m,test[4];
char ch='y';
cout<<"Please wait for the train of NN:"<<endl;
trainNN();
cout<<"Now,this modular network can work for you."<<endl;
while(ch=='y' || ch=='Y')
{
cout<<"Please input data to be tested."<<endl;
for (m=1;m<=3;m++)
cin>>test[m];
ch=getchar();
o[1][1]=test[1];
o[1][2]=test[2];
o[1][3]=test[3];
netout(8,1);
result=o[3][1];
printf("Final result is %f.n",result);
printf("Still test?[Yes] or [No]n");
ch=getchar();
}
return 0;
}
來源:向明天進(jìn)軍0次
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