预测模型基于小波神经网络的短时交通流量预测matlab源码

Posted 2021-05-25 Matlab咨询QQ1575304183

一、简介

二、源代码

%% 清空环境变量
clc
clear
 
%% 网络参数配置
load traffic_flux input output input_test output_test
 
M=size(input,2); %输入节点个数
N=size(output,2); %输出节点个数
 
n=6; %隐形节点个数
lr1=0.01; %学习概率
lr2=0.001; %学习概率
maxgen=100; %迭代次数
 
%权值初始化
Wjk=randn(n,M);Wjk_1=Wjk;Wjk_2=Wjk_1;
Wij=randn(N,n);Wij_1=Wij;Wij_2=Wij_1;
a=randn(1,n);a_1=a;a_2=a_1;
b=randn(1,n);b_1=b;b_2=b_1;
 
%节点初始化
y=zeros(1,N);
net=zeros(1,n);
net_ab=zeros(1,n);
 
%权值学习增量初始化
d_Wjk=zeros(n,M);
d_Wij=zeros(N,n);
d_a=zeros(1,n);
d_b=zeros(1,n);
 
%% 输入输出数据归一化
[inputn,inputps]=mapminmax(input');
[outputn,outputps]=mapminmax(output'); 
inputn=inputn';
outputn=outputn';
 
%% 网络训练
for i=1:maxgen
    
    %误差累计
    error(i)=0;
    
    % 循环训练
    for kk=1:size(input,1)
        x=inputn(kk,:);
        yqw=outputn(kk,:);
   
        for j=1:n
            for k=1:M
                net(j)=net(j)+Wjk(j,k)*x(k);
                net_ab(j)=(net(j)-b(j))/a(j);
            end
            temp=mymorlet(net_ab(j));
            for k=1:N
                y=y+Wij(k,j)*temp;   %小波函数
            end
        end
        
        %计算误差和
        error(i)=error(i)+sum(abs(yqw-y));
        
        %权值调整
        for j=1:n
            %计算d_Wij
            temp=mymorlet(net_ab(j));
            for k=1:N
                d_Wij(k,j)=d_Wij(k,j)-(yqw(k)-y(k))*temp;
            end
            %计算d_Wjk
            temp=d_mymorlet(net_ab(j));
            for k=1:M
                for l=1:N
                    d_Wjk(j,k)=d_Wjk(j,k)+(yqw(l)-y(l))*Wij(l,j) ;
                end
                d_Wjk(j,k)=-d_Wjk(j,k)*temp*x(k)/a(j);
            end
            %计算d_b
            for k=1:N
                d_b(j)=d_b(j)+(yqw(k)-y(k))*Wij(k,j);
            end
            d_b(j)=d_b(j)*temp/a(j);
            %计算d_a
            for k=1:N
                d_a(j)=d_a(j)+(yqw(k)-y(k))*Wij(k,j);
            end
            d_a(j)=d_a(j)*temp*((net(j)-b(j))/b(j))/a(j);
        end
        
        %权值参数更新      
        Wij=Wij-lr1*d_Wij;
        Wjk=Wjk-lr1*d_Wjk;
        b=b-lr2*d_b;
        a=a-lr2*d_a;
    
        d_Wjk=zeros(n,M);
        d_Wij=zeros(N,n);
        d_a=zeros(1,n);
        d_b=zeros(1,n);
 
        y=zeros(1,N);
        net=zeros(1,n);
        net_ab=zeros(1,n);
        
        Wjk_1=Wjk;Wjk_2=Wjk_1;
        Wij_1=Wij;Wij_2=Wij_1;
        a_1=a;a_2=a_1;
        b_1=b;b_2=b_1;
    end
end

三、运行结果

四、备注

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