大家好，又见面了，我是你们的朋友全栈君。
由于参加了一个小的课题，是关于时间序列预测的。平时习惯用matlab， 网上这种资源就比较少。
借鉴了 http://blog.csdn.net/u010540396/article/details/52797489 的内容，稍微修改了一下程序。
程序说明：DATA.mat 是一行时序值，
numdely 是用前numdely个点预测当前点，cell_num是隐含层的数目，cost_gate 是误差的阈值。
直接在命令行输入RunLstm(numdely,cell_num,cost_gate)即可。
function [r1, r2] = RunLstm(numdely,cell_num,cost_gate)
%% 数据加载，并归一化处理
figure;
[train_data,test_data]=LSTM_data_process(numdely);
data_length=size(train_data,1)-1;
data_num=size(train_data,2);
%% 网络参数初始化
% 结点数设置
input_num=data_length;
% cell_num=5;
output_num=1;
% 网络中门的偏置
bias_input_gate=rand(1,cell_num);
bias_forget_gate=rand(1,cell_num);
bias_output_gate=rand(1,cell_num);
%网络权重初始化
ab=20;
weight_input_x=rand(input_num,cell_num)/ab;
weight_input_h=rand(output_num,cell_num)/ab;
weight_inputgate_x=rand(input_num,cell_num)/ab;
weight_inputgate_c=rand(cell_num,cell_num)/ab;
weight_forgetgate_x=rand(input_num,cell_num)/ab;
weight_forgetgate_c=rand(cell_num,cell_num)/ab;
weight_outputgate_x=rand(input_num,cell_num)/ab;
weight_outputgate_c=rand(cell_num,cell_num)/ab;
%hidden_output权重
weight_preh_h=rand(cell_num,output_num);
%网络状态初始化
% cost_gate=0.25;
h_state=rand(output_num,data_num);
cell_state=rand(cell_num,data_num);
%% 网络训练学习
for iter=1:100
yita=0.01; %每次迭代权重调整比例
for m=1:data_num
%前馈部分
if(m==1)
gate=tanh(train_data(1:input_num,m)'*weight_input_x);
input_gate_input=train_data(1:input_num,m)'*weight_inputgate_x+bias_input_gate;
output_gate_input=train_data(1:input_num,m)'*weight_outputgate_x+bias_output_gate;
for n=1:cell_num
input_gate(1,n)=1/(1+exp(-input_gate_input(1,n)));
output_gate(1,n)=1/(1+exp(-output_gate_input(1,n)));
end
forget_gate=zeros(1,cell_num);
forget_gate_input=zeros(1,cell_num);
cell_state(:,m)=(input_gate.*gate)';
else
gate=tanh(train_data(1:input_num,m)'*weight_input_x+h_state(:,m-1)'*weight_input_h);
input_gate_input=train_data(1:input_num,m)'*weight_inputgate_x+cell_state(:,m-1)'*weight_inputgate_c+bias_input_gate;
forget_gate_input=train_data(1:input_num,m)'*weight_forgetgate_x+cell_state(:,m-1)'*weight_forgetgate_c+bias_forget_gate;
output_gate_input=train_data(1:input_num,m)'*weight_outputgate_x+cell_state(:,m-1)'*weight_outputgate_c+bias_output_gate;
for n=1:cell_num
input_gate(1,n)=1/(1+exp(-input_gate_input(1,n)));
forget_gate(1,n)=1/(1+exp(-forget_gate_input(1,n)));
output_gate(1,n)=1/(1+exp(-output_gate_input(1,n)));
end
cell_state(:,m)=(input_gate.*gate+cell_state(:,m-1)'.*forget_gate)';
end
pre_h_state=tanh(cell_state(:,m)').*output_gate;
h_state(:,m)=(pre_h_state*weight_preh_h)';
end
% 误差的计算
% Error=h_state(:,m)-train_data(end,m);
Error=h_state(:,:)-train_data(end,:);
Error_Cost(1,iter)=sum(Error.^2);
if Error_Cost(1,iter) < cost_gate
iter
break;
end
[ weight_input_x,...
weight_input_h,...
weight_inputgate_x,...
weight_inputgate_c,...
weight_forgetgate_x,...
weight_forgetgate_c,...
weight_outputgate_x,...
weight_outputgate_c,...
weight_preh_h ]=LSTM_updata_weight(m,yita,Error,...
weight_input_x,...
weight_input_h,...
weight_inputgate_x,...
weight_inputgate_c,...
weight_forgetgate_x,...
weight_forgetgate_c,...
weight_outputgate_x,...
weight_outputgate_c,...
weight_preh_h,...
cell_state,h_state,...
input_gate,forget_gate,...
output_gate,gate,...
train_data,pre_h_state,...
input_gate_input,...
output_gate_input,...
forget_gate_input);
end
%% 绘制Error-Cost曲线图
for n=1:1:iter
semilogy(n,Error_Cost(1,n),'*');
hold on;
title('Error-Cost曲线图');
end
%% 数据检验
%数据加载
test_final=test_data;
test_final=test_final/sqrt(sum(test_final.^2));
total = sqrt(sum(test_data.^2));
test_output=test_data(:,end);
%前馈
m=data_num;
gate=tanh(test_final(1:input_num)'*weight_input_x+h_state(:,m-1)'*weight_input_h);
input_gate_input=test_final(1:input_num)'*weight_inputgate_x+cell_state(:,m-1)'*weight_inputgate_c+bias_input_gate;
forget_gate_input=test_final(1:input_num)'*weight_forgetgate_x+cell_state(:,m-1)'*weight_forgetgate_c+bias_forget_gate;
output_gate_input=test_final(1:input_num)'*weight_outputgate_x+cell_state(:,m-1)'*weight_outputgate_c+bias_output_gate;
for n=1:cell_num
input_gate(1,n)=1/(1+exp(-input_gate_input(1,n)));
forget_gate(1,n)=1/(1+exp(-forget_gate_input(1,n)));
output_gate(1,n)=1/(1+exp(-output_gate_input(1,n)));
end
cell_state_test=(input_gate.*gate+cell_state(:,m-1)'.*forget_gate)';
pre_h_state=tanh(cell_state_test').*output_gate;
h_state_test=(pre_h_state*weight_preh_h)'* total;
test_output(end);
test = sprintf('----Test result is %s----' ,num2str(h_state_test));
true = sprintf('----True result is %s----' ,num2str(test_output(end)));
disp(test);
disp(true);
function [train_data,test_data]=LSTM_data_process(numdely)
load('DATA.mat');
numdata = size(a,1);
numsample = numdata - numdely - 1;
train_data = zeros(numdely+1, numsample);
test_data = zeros(numdely+1,1);
for i = 1 :numsample
train_data(:,i) = a(i:i+numdely)';
end
test_data = a(numdata-numdely: numdata);
data_length=size(train_data,1);
data_num=size(train_data,2);
%
%%归一化过程
for n=1:data_num
train_data(:,n)=train_data(:,n)/sqrt(sum(train_data(:,n).^2));
end
% for m=1:size(test_data,2)
% test_data(:,m)=test_data(:,m)/sqrt(sum(test_data(:,m).^2));
% endfunction [ weight_input_x,weight_input_h,weight_inputgate_x,weight_inputgate_c,weight_forgetgate_x,weight_forgetgate_c,weight_outputgate_x,weight_outputgate_c,weight_preh_h ]=LSTM_updata_weight(n,yita,Error,...
weight_input_x, weight_input_h, weight_inputgate_x,weight_inputgate_c,weight_forgetgate_x,weight_forgetgate_c,weight_outputgate_x,weight_outputgate_c,weight_preh_h,...
cell_state,h_state,input_gate,forget_gate,output_gate,gate,train_data,pre_h_state,input_gate_input, output_gate_input,forget_gate_input)
data_length=size(train_data,1) - 1;
data_num=size(train_data,2);
weight_preh_h_temp=weight_preh_h;
%%% 权重更新函数
input_num=data_length;
cell_num=size(weight_preh_h_temp,1);
output_num=1;
%% 更新weight_preh_h权重
for m=1:output_num
delta_weight_preh_h_temp(:,m)=2*Error(m,1)*pre_h_state;
end
weight_preh_h_temp=weight_preh_h_temp-yita*delta_weight_preh_h_temp;
%% 更新weight_outputgate_x
for num=1:output_num
for m=1:data_length
delta_weight_outputgate_x(m,:)=(2*weight_preh_h(:,num)*Error(num,1).*tanh(cell_state(:,n)))'.*exp(-output_gate_input).*(output_gate.^2)*train_data(m,n);
end
weight_outputgate_x=weight_outputgate_x-yita*delta_weight_outputgate_x;
end
%% 更新weight_inputgate_x
for num=1:output_num
for m=1:data_length
delta_weight_inputgate_x(m,:)=2*(weight_preh_h(:,num)*Error(num,1))'.*output_gate.*(ones(size(cell_state(:,n)))-tanh(cell_state(:,n)).^2)'.*gate.*exp(-input_gate_input).*(input_gate.^2)*train_data(m,n);
end
weight_inputgate_x=weight_inputgate_x-yita*delta_weight_inputgate_x;
end
if(n~=1)
%% 更新weight_input_x
temp=train_data(1:input_num,n)'*weight_input_x+h_state(:,n-1)'*weight_input_h;
for num=1:output_num
for m=1:data_length
delta_weight_input_x(m,:)=2*(weight_preh_h(:,num)*Error(num,1))'.*output_gate.*(ones(size(cell_state(:,n)))-tanh(cell_state(:,n)).^2)'.*input_gate.*(ones(size(temp))-tanh(temp.^2))*train_data(m,n);
end
weight_input_x=weight_input_x-yita*delta_weight_input_x;
end
%% 更新weight_forgetgate_x
for num=1:output_num
for m=1:data_length
delta_weight_forgetgate_x(m,:)=2*(weight_preh_h(:,num)*Error(num,1))'.*output_gate.*(ones(size(cell_state(:,n)))-tanh(cell_state(:,n)).^2)'.*cell_state(:,n-1)'.*exp(-forget_gate_input).*(forget_gate.^2)*train_data(m,n);
end
weight_forgetgate_x=weight_forgetgate_x-yita*delta_weight_forgetgate_x;
end
%% 更新weight_inputgate_c
for num=1:output_num
for m=1:cell_num
delta_weight_inputgate_c(m,:)=2*(weight_preh_h(:,num)*Error(num,1))'.*output_gate.*(ones(size(cell_state(:,n)))-tanh(cell_state(:,n)).^2)'.*gate.*exp(-input_gate_input).*(input_gate.^2)*cell_state(m,n-1);
end
weight_inputgate_c=weight_inputgate_c-yita*delta_weight_inputgate_c;
end
%% 更新weight_forgetgate_c
for num=1:output_num
for m=1:cell_num
delta_weight_forgetgate_c(m,:)=2*(weight_preh_h(:,num)*Error(num,1))'.*output_gate.*(ones(size(cell_state(:,n)))-tanh(cell_state(:,n)).^2)'.*cell_state(:,n-1)'.*exp(-forget_gate_input).*(forget_gate.^2)*cell_state(m,n-1);
end
weight_forgetgate_c=weight_forgetgate_c-yita*delta_weight_forgetgate_c;
end
%% 更新weight_outputgate_c
for num=1:output_num
for m=1:cell_num
delta_weight_outputgate_c(m,:)=2*(weight_preh_h(:,num)*Error(num,1))'.*tanh(cell_state(:,n))'.*exp(-output_gate_input).*(output_gate.^2)*cell_state(m,n-1);
end
weight_outputgate_c=weight_outputgate_c-yita*delta_weight_outputgate_c;
end
%% 更新weight_input_h
temp=train_data(1:input_num,n)'*weight_input_x+h_state(:,n-1)'*weight_input_h;
for num=1:output_num
for m=1:output_num
delta_weight_input_h(m,:)=2*(weight_preh_h(:,num)*Error(num,1))'.*output_gate.*(ones(size(cell_state(:,n)))-tanh(cell_state(:,n)).^2)'.*input_gate.*(ones(size(temp))-tanh(temp.^2))*h_state(m,n-1);
end
weight_input_h=weight_input_h-yita*delta_weight_input_h;
end
else
%% 更新weight_input_x
temp=train_data(1:input_num,n)'*weight_input_x;
for num=1:output_num
for m=1:data_length
delta_weight_input_x(m,:)=2*(weight_preh_h(:,num)*Error(num,1))'.*output_gate.*(ones(size(cell_state(:,n)))-tanh(cell_state(:,n)).^2)'.*input_gate.*(ones(size(temp))-tanh(temp.^2))*train_data(m,n);
end
weight_input_x=weight_input_x-yita*delta_weight_input_x;
end
end
weight_preh_h=weight_preh_h_temp;
end
—————————————2017.08.03 UPDATE—————————————-
代码数据链接：
http://download.csdn.net/detail/u011060119/9919621
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