神经网络BP算法程序C语言.docx
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神经网络BP算法程序C语言
神经网络BP算法(C程序)
文件输入输出目录为:
F:
\BP\
训练样本文件名:
训练样本.txt
值为:
11-11-110101
输出文件名为:
阈值.txt 权值.txt
=========================
#include"stdlib.h"
#include"math.h"
#include"conio.h"
#include"stdio.h"
#defineN2/*/学习样本个数*/
#defineIN3/*/输入层神经元数目*/
#defineHN3/*/隐层神经元数目*/
#defineON2/*/输出层神经元数目*/
#defineZ20/*旧权值保存,每次study的权值都保存下来*/
doubleP[IN];/*单个样本输入数据*/
doubleT[ON];/*单个样本输出数据*/
doubleW[HN][IN];/*/输入层至隐层权值*/
doubleV[ON][HN];/*/隐层至输出层权值*/
doubleX[HN];/*/隐层的输入*/
doubleY[ON];/*/输出层的输入*/
doubleH[HN];/*/隐层的输出*/
doubleO[ON];/*/输出层的输出*/
doubleYU_HN[HN];/*/隐层的阈值*/
doubleYU_ON[ON];/*/输出层的阈值*/
doubleerrm[N];/*/第m个样本的总误差*/
doublea;/*/输出层至隐层的学习效率*/
doubleb;/*/隐层至输入层学习效率*/
doublealpha; /*/动量因子,改进型bp算法使用*/
doublederr[ON];
FILE*fp;
/*定义一个放学习样本的结构*/
struct{
doubleinput[IN];
doubleteach[ON];
}Study_Data[N];
/*改进型bp算法用来保存每次计算的权值*/
struct{
doubleold_W[HN][IN];
doubleold_V[ON][HN];
}Old_WV[Z];
显示开始界面
intStart_Show()
{
clrscr();
printf("\n ***********************\n");
printf(" * Welcometouse *\n");
printf(" * thisprogramof *\n");
printf(" * calculatingtheBP*\n");
printf(" * model!
*\n");
printf(" * Happyeveryday!
*\n");
printf(" ***********************\n");
printf("\n\nBeforestarting,pleasereadthefollowscarefully:
\n\n");
printf(" 1.PleaseensurethePathofthe'训练样本.txt'(xunlianyangben.txt)is\ncorrect,like'F:
\BP\训练样本.txt'!
\n");
printf(" 2.ThecalculatingresultswillbesavedinthePathof'F:
\\BP\\'!
\n");
printf(" 3.Theprogramwillload10dataswhenrunningfrom'F:
\\BP\\训练样本.txt'!
\n");
printf(" 4.TheprogramofBPcanstudyitselffornomorethan30000times.\nAndsurpassingthenumber,theprogramwillbeendedbyitselfin\npreventingrunninginfinitelybecauseoferror!
\n");
printf("\n\n\n");
printf("Nowpressanykeytostart...\n");
getch();
getch();
clrscr();
}
显示结束界面
intEnd_Show()
{
printf("\n\n---------------------------------------------------\n");
printf("Theprogramhasreachedtheendsuccessfully!
\n\nPressanykeytoexit!
\n\n");
printf("\n ***********************\n");
printf(" * Thisistheend *\n");
printf(" *oftheprogramwhich*\n");
printf(" *cancalculatetheBP*\n");
printf(" * model!
*\n");
printf(" ***********************\n");
printf(" * Thanksforusing!
*\n");
printf(" * Happyeveryday!
*\n");
printf(" ***********************\n");
getch();
exit(0);
}
获取训练样本
GetTrainingData() /*OK*/
{intm,i,j;
intdatr;
if((fp=fopen("f:
\\bp\\训练样本.txt","r"))==NULL) /*读取训练样本*/
{
printf("Cannotopenfileandstrikeanykeyexit!
");
getch();
exit
(1);
}
m=0;
i=0;
j=0;
while(fscanf(fp,"%d",&datr)!
=EOF)
{j++;
if(j<=(N*IN))/*N为学习样本个数;IN为输入层神经元数目*/
{
if(i {
Study_Data[m].input[i]=datr;
/*printf("\ntheStudy_Datat[%d].input[%d]=%f\n",m,i,Study_Data[m].input[i]);getch();*/ /*usetochecktheloadedtrainingdatas*/
}
if(m==(N-1)&&i==(IN-1))
{
m=0;
i=-1;
}
if(i==(IN-1))
{
m++;
i=-1;
}
}
elseif((N*IN) {if(i {Study_Data[m].teach[i]=datr;
/*printf("\nTheStudy_Data[%d].teach[%d]=%f",m,i,Study_Data[m].teach[i]);getch();*/ /*usetochecktheloadedtrainingdatas*/
}
if(m==(N-1)&&i==(ON-1))
printf("\n");
if(i==(ON-1))
{m++;
i=-1;
}
}
i++;
}
fclose(fp);
printf("\nThereare[%d]datatsthathavebeenloadedsuccessfully!
\n",j);
/*showthedatawhichhasbeenloaded!
*/
printf("\nShowthedatawhichhasbeenloadedasfollows:
\n");
for(m=0;m {for(i=0;i {printf("\nStudy_Data[%d].input[%d]=%f",m,i,Study_Data[m].input[i]);
}
for(j=0;j {printf("\nStudy_Data[%d].teach[%d]=%f",m,j,Study_Data[m].teach[j]);
}
}
printf("\n\nPressanykeytostartcalculating...");
getch();
return1;
}
/*///////////////////////////////////*/
/*初始化权、阈值子程序*/
/*///////////////////////////////////*/
initial()
{inti;
intii;
intj;
intjj;
intk;
intkk;
/*隐层权、阈值初始化*/
for(i=0;i {
for(j=1;j {W[i][j]=(double)((rand()/32767.0)*2-1);/*初始化输入层到隐层的权值,随机模拟0和1-1*/
printf("w[%d][%d]=%f\n",i,j,W[i][j]);
}
}
for(ii=0;ii {
for(jj=0;jj {V[ii][jj]=(double)((rand()/32767.0)*2-1);/*初始化隐层到输出层的权值,随机模拟0和1-1*/
printf("V[%d][%d]=%f\n",ii,jj,V[ii][jj]);
}
}
for(k=0;k {
YU_HN[k]=(double)((rand()/32767.0)*2-1); /*隐层阈值初始化,-0.01~0.01之间*/
printf("YU_HN[%d]=%f\n",k,YU_HN[k]);
}
for(kk=0;kk {
YU_ON[kk]=(double)((rand()/32767.0)*2-1);/*输出层阈值初始化,-0.01~0.01之间*/
}
return1;
}/*子程序initial()结束*/
/*//////////////////////////////////////////*/
/*第m个学习样本输入子程序*/
/*/////////////////////////////////////////*/
input_P(intm)
{inti,j;
for(i=0;i {P[i]=Study_Data[m].input[i];
printf("P[%d]=%f\n",i,P[i]);
}
/*获得第m个样本的数据*/
return1;
}/*子程序input_P(m)结束*/
/*/////////////////////////////////////////*/
/*第m个样本教师信号子程序*/
/*/////////////////////////////////////////*/
input_T(intm)
{intk;
for(k=0;k T[k]=Study_Data[m].teach[k];
return1;
}/*子程序input_T(m)结束*/
H_I_O()
{
doublesigma;
inti,j;
for(j=0;j {
sigma=0;
for(i=0;i {sigma+=W[j][i]*P[i];/*求隐层内积*/
}
X[j]=sigma-YU_HN[i];/*求隐层净输入,为什么减隐层的阀值*/
H[j]=1.0/(1.0+exp(-X[j]));/*求隐层输出siglon算法*/
}
return1;
}/*子程序H_I_O()结束*/
O_I_O()
{intk;
intj;
doublesigma;
for(k=0;k {
sigma=0.0;
for(j=0;j {
sigma+=V[k][j]*H[k];
}
Y[k]=sigma-YU_ON[k];
O[k]=1.0/(1.0+exp(-Y[k]));
}
return1;
}
intErr_O_H(intm)
{intk;
doubleabs_err[ON];
doublesqr_err=0;
for(k=0;k {
abs_err[k]=T[k]-O[k];
sqr_err+=(abs_err[k])*(abs_err[k]);
d_err[k]=abs_err[k]*O[k]*(1.0-O[k]);
err_m[m]=sqr_err/2;
}
return1;
}
doublee_err[HN];
intErr_H_I()
{
intj,k;
doublesigma;
for(j=0;j {
sigma=0.0;
for(k=0;k {
sigma+=d_err[k]*V[k][j];
}
e_err[j]=sigma*H[j]*(1-H[j]);
}
return1;
}
saveWV(intm)
{inti;
intii;
intj;
intjj;
for(i=0;i {
for(j=0;j {
Old_WV[m].old_W[i][j]=W[i][j];
}
}
for(ii=0;ii {
for(jj=0;jj {
Old_WV[m].old_V[ii][jj]=V[ii][jj];
}
}
return1;
}
intDelta_O_H(intn) /*(intm,intn)*/
{intk,j;
if(n<1) /*n<=1*/
{
for(k=0;k {
for(j=0;j {
V[k][j]=V[k][j]+a*d_err[k]*H[j];
}
YU_ON[k]+=a*d_err[k];
}
}
elseif(n>1)
{
for(k=0;k {
for(j=0;j {
V[k][j]=V[k][j]+a*d_err[k]*H[j]+alpha*(V[k][j]-Old_WV[(n-1)].old_V[k][j]);
}
YU_ON[k]+=a*d_err[k];
}
}
return1;
}
Delta_H_I(intn) /*(intm,intn)*/
{inti,j;
if(n<=1) /*n<=1*/
{
for(j=0;j {
for(i=0;i {
W[j][i]=W[j][i]+b*e_err[j]*P[i];
}
YU_HN[j]+=b*e_err[j];
}
}
elseif(n>1)
{
for(j=0;j {
for(i=0;i {
W[j][i]=W[j][i]+b*e_err[j]*P[i]+alpha*(W[j][i]-Old_WV[(n-1)].old_W[j][i]);
}
YU_HN[j]+=b*e_err[j];
}
}
return1;
}
doubleErr_Sum()
{intm;
doubletotal_err=0;
for(m=0;m {
total_err+=err_m[m];
}
returntotal_err;
}
voidsavequan()
{inti,j,k;
intii,jj,kk;
if((fp=fopen("f:
\\bp\\权值.txt","a"))==NULL) /*savetheresultatf:
\hsz\bpc\*.txt*/
{
printf("Cannotopenfilestrikeanykeyexit!
");
getch();
exit
(1);
}
fprintf(fp,"Savetheresultof“权值”(quanzhi)asfollows:
\n");
for(i=0;i {
for(j=0;j fprintf(fp,"W[%d][%d]=%f\n",i,j,W[i][j]);
}
fprintf(fp,"\n");
for(ii=0;ii {
for(jj=0;jj fprintf(fp,"V[%d][%d]=%f\n",ii,jj,V[ii][jj]);
}
fclose(fp);
printf("\nTheresultof“权值.txt”(quanzhi)hasbeensavedsuccessfully!
\nPressanykeytocontinue...");
getch();
if((fp=fopen("f:
\\bp\\阈值.txt","a"))==NULL) /*savetheresultatf:
\hsz\bpc\*/
{
printf("Cannotopenfilestrikeanykeyexit!
");
getch();
exit
(1);
}
fprintf(fp,"Savetheresultof“输出层的阈值”(huozhi)asfollows:
\n");
for(k=0;k fprintf(fp,"YU_ON[%d]=%f\n",k,YU_ON[k]);
fprintf(fp,"\nSavetheresultof“隐层的阈值为”(huozhi)asfollows:
\n");
for(kk=0;kk fprintf(fp,"YU_HN[%d]=%f\n",kk,YU_HN[kk]);
fclose(fp);
printf("\nTheresultof“阈值.txt”(huozhi)hasbeensavedsuccessfully!
\nPressanykeytocontinue...");
getch();
}
/**********************/
/**程序入口,即主程序**/
/**********************/
voidmain()
{doublePre_error;
doublesum_err;
intstudy;
intflag;
flag=30000;
a=0.7;
b=0.7;
alpha=0.9;
study=0;
Pre_error=0.0001;/*实际值为Pre_error=0.0001;*/
Start_Show();/*调用函数,显示开始界面*/
GetTrainingData();
initial();
do
{intm;
++study;
for(m=0;m {
input_P(m);
input_T(m);
H_I_O();
O_I_O();
Err_O_H(m);
Err_H_I();
saveWV(m); /****************/
Delta_O_H(m); /*(m,study)*/
Delta_H_I(m); /*(m,study)*/
}
sum_err=Err_Sum();
printf("sum_err=%f\n",sum_err);
printf("Pre_error=%f\n\n",Pre_error);
if(study>flag)
{
printf("\n*