新版Matlab中神经网络训练函数Newff的使用方法.docx
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新版Matlab中神经网络训练函数Newff的使用方法.docx
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新版Matlab中神经网络训练函数Newff的使用方法
新版Matlab中神经网络训练函数Newff的使用方法
一、介绍新版newff
Syntax
net=newff(P,T,[S1S2...S(N-l)],{TF1TF2...TFNl},BTF,BLF,PF,IPF,OPF,DDF)
Description
newff(P,T,[S1S2...S(N-l)],{TF1TF2...TFNl},BTF,BLF,PF,IPF,OPF,DDF)takesseveral
arguments
PRxQ1matrixofQ1sampleR-elementinputvectors
TSNxQ2matrixofQ2sampleSN-elementtargetvectors
Sizeofithlayer,forN-1layers,default=[].Si(OutputlayersizeSNisdeterminedfromT.)
Transferfunctionofithlayer.(Default='tansig'forTFihiddenlayersand'purelin'foroutputlayer.)
BTFBackpropagationnetworktrainingfunction(default='trainlm')
BLFBackpropagationweight/biaslearningfunction(default='learngdm')
IPFRowcellarrayofinputprocessingfunctions.(Default={'fixunknowns','removeconstantrows','mapminmax'})
OPFRowcellarrayofoutputprocessingfunctions.(Default={'removeconstantrows','mapminmax'})
DDFDatadivisonfunction(default='dividerand')
Examples
HereisaproblemconsistingofinputsPandtargetsTtobesolvedwithanetwork.
P=[012345678910];T=[01234321234];
Hereanetworkiscreatedwithonehiddenlayeroffiveneurons.
net=newff(P,T,5);
Thenetworkissimulatedanditsoutputplottedagainstthetargets.
Y=sim(net,P);plot(P,T,P,Y,'o')
Thenetworkistrainedfor50epochs.Againthenetwork'soutputisplotted.
net.trainParam.epochs=50;net=train(net,P,T);Y=sim(net,P);plot(P,T,P,Y,'o')二、新版newff与旧版newff调用语法对比
Example1
比如输入input(6*1000),输出output为(4*1000),那么
旧版定义:
net=newff(minmax(input),[7,1],{'tansig','purelin'},'trainlm');
新版定义:
net=newff(input,output,7,{'tansig','purelin'},'trainlm');Example2
比如输入input(6*1000),输出output为(4*1000),那么
旧版定义:
net=newff(minmax(input),[49,10,1],{'tansig','tansig','tansig'},'traingdx');
新版定义:
net=newff(input,output,[49,10],{'tansig','tansig','tansig'},'traingdx');
regulations,constructionscaffoldingissafeandreliable,andclimbingladders,liftingCommander1established,full-timesafetyofficer1,responsibleforcheckingthesafetyguaranteemeasures,echoedupanddown,preventaccidents.12)trafficpavementinaccordancewithrequirementsofthetransportsector,andseparatedbyclosedisolationbarrier,constructionandnon-constructionwithbarrierisolation.13)volunteerfireorganizations,employeesconductingfirepreventionpublicityandeducationoftheknowledge,skills,andorganizationalimplementationoffire-fightingandemergencyevacuationplansandwalkthroughs.8.4.5specificconstructionprogramforsafetytechnologyaccordingtotheHebeiprovincialconstructionsafetyinspectionrulesfortheimplementationofrequirementsofthestandard,aseparatespecificconstructionprogramforthefollowing1)scaffolderection,dismantlingprogramme;2)Foundationsupportschemes;3)constructionprojectoftemplateengineering;4)"threetreasures","four"protectionscheme;5)constructionorganizationdesignoftemporarypowersupply;6)installation,demolitionofatowercraneprogramme;7)liftingoperationplan.8.58.5.1environmentalmanagementgoalsofenvironmentalprotection,civilizationconstructionwithoutmajorenvironmentalpollutionaccident,wastegas,wastewater,noise,dust,solid
三、旧版newff使用方法在新版本中使用
提示:
旧版本定义的newff虽也能在新版本中使用,但会有警告,警告如下:
Warning:
NEWFFusedinanobsoleteway.>Inobs_useat18
Innewff>create_networkat127
Innewffat102
SeehelpforNEWFFtoupdatecallstothenewargumentlist.
四、新版newff与旧版newff使用的训练效果对比
旧版本:
旧用法训练次数多,但精度高
新版本:
新用法训练次数少,但精度可能达不到要求
造成上述原因是:
程序里面的权值、阈值的初始值是随机赋值的,所以每次运行的结果都会不一样,
有好有坏。
你可以把预测效果不错的网络的权值和阈值作为初始值。
具体可以查看net.iw{1,1}、net.lw{2,1}、net.b{1}、net.b{2}的值。
regulations,constructionscaffoldingissafeandreliable,andclimbingladders,liftingCommander1established,full-timesafetyofficer1,responsibleforcheckingthesafetyguaranteemeasures,echoedupanddown,preventaccidents.12)trafficpavementinaccordancewithrequirementsofthetransportsector,andseparatedbyclosedisolationbarrier,constructionandnon-constructionwithbarrierisolation.13)volunteerfireorganizations,employeesconductingfirepreventionpublicityandeducationoftheknowledge,skills,andorganizationalimplementationoffire-fightingandemergencyevacuationplansandwalkthroughs.8.4.5specificconstructionprogramforsafetytechnologyaccordingtotheHebeiprovincialconstructionsafetyinspectionrulesfortheimplementationofrequirementsofthestandard,aseparatespecificconstructionprogramforthefollowing1)scaffolderection,dismantlingprogramme;2)Foundationsupportschemes;3)constructionprojectoftemplateengineering;4)"threetreasures","four"protectionscheme;5)constructionorganizationdesignoftemporarypowersupply;6)installation,demolitionofatowercraneprogramme;7)liftingoperationplan.8.58.5.1environmentalmanagementgoalsofenvironmentalprotection,civilizationconstructionwithoutmajorenvironmentalpollutionaccident,wastegas,wastewater,noise,dust,solid
现在给一个完整的例子
%%清空环境变量
clc
clear
%%训练数据预测数据
data=importdata('test.txt');
%从1到768间随机排序
k=rand(1,768);
[m,n]=sort(k);
%输入输出数据
input=data(:
1:
8);
output=data(:
9);
%随机提取500个样本为训练样本,268个样本为预测样本input_train=input(n(1:
500),:
)';output_train=output(n(1:
500),:
)';input_test=input(n(501:
768),:
)';output_test=output(n(501:
768),:
)';
%输入数据归一化
[inputn,inputps]=mapminmax(input_train);
%%BP网络训练
%%初始化网络结构
net=newff(inputn,output_train,10);
net.trainParam.epochs=1000;
net.trainParam.lr=0.1;
net.trainParam.goal=0.0000004;
%%网络训练
net=train(net,inputn,output_train);
%%BP网络预测
%预测数据归一化
inputn_test=mapminmax('apply',input_test,inputps);
%网络预测输出
BPoutput=sim(net,inputn_test);
%%结果分析
regulations,constructionscaffoldingissafeandreliable,andclimbingladders,liftingCommander1established,full-timesafetyofficer1,responsibleforcheckingthesafetyguaranteemeasures,echoedupanddown,preventaccidents.12)trafficpavementinaccordancewithrequirementsofthetransportsector,andseparatedbyclosedisolationbarrier,constructionandnon-constructionwithbarrierisolation.13)volunteerfireorganizations,employeesconductingfirepreventionpublicityandeducationoftheknowledge,skills,andorganizationalimplementationoffire-fightingandemergencyevacuationplansandwalkthroughs.8.4.5specificconstructionprogramforsafetytechnologyaccordingtotheHebeiprovincialconstructionsafetyinspectionrulesfortheimplementationofrequirementsofthestandard,aseparatespecificconstructionprogramforthefollowing1)scaffolderection,dismantlingprogramme;2)Foundationsupportschemes;3)constructionprojectoftemplateengineering;4)"threetreasures","four"protectionscheme;5)constructionorganizationdesignoftemporarypowersupply;6)installation,demolitionofatowercraneprogramme;7)liftingoperationplan.8.58.5.1environmentalmanagementgoalsofenvironmentalprotection,civilizationconstructionwithoutmajorenvironmentalpollutionaccident,wastegas,wastewater,noise,dust,solid
%根据网络输出找出数据属于哪类
BPoutput(find(BPoutput<0.5))=0;BPoutput(find(BPoutput>=0.5))=1;
%%结果分析
%画出预测种类和实际种类的分类图
figure
(1)
plot(BPoutput,'og')
holdon
plot(output_test,'r*');
legend('预测类别','输出类别')
title('BP网络预测分类与实际类别比对','fontsize',12)ylabel('类别标签','fontsize',12)
xlabel('样本数目','fontsize',12)
ylim([-0.51.5])
%预测正确率
rightnumber=0;
fori=1:
size(output_test,2)
ifBPoutput(i)==output_test(i)
rightnumber=rightnumber+1;
end
end
rightratio=rightnumber/size(output_test,2)*100;
sprintf('测试准确率=%0.2f',rightratio)
regulations,constructionscaffoldingissafeandreliable,andclimbingladders,liftingCommander1established,full-timesafetyofficer1,responsibleforcheckingthesafetyguaranteemeasures,echoedupanddown,preventaccidents.12)trafficpavementinaccordancewithrequirementsofthetransportsector,andseparatedbyclosedisolationbarrier,constructionandnon-constructionwithbarrierisolation.13)volunteerfireorganizations,employeesconductingfirepreventionpublicityandeducationoftheknowledge,skills,andorganizationalimplementationoffire-fightingandemergencyevacuationplansandwalkthroughs.8.4.5specificconstructionprogramforsafetytechnologyaccordingtotheHebeiprovincialconstructionsafetyinspectionrulesfortheimplementationofrequirementsofthestandard,aseparatespecificconstructionprogramforthefollowing1)scaffolderection,dismantlingprogramme;2)Foundationsupportschemes;3)constructionprojectoftemplateengineering;4)"threetreasures","four"protectionscheme;5)constructionorganizationdesignoftemporarypowersupply;6)installation,demolitionofatowercraneprogramme;7)liftingoperationplan.8.58.5.1environmentalmanagementgoalsofenvironmentalprotection,civilizationconstructionwithoutmajorenvironmentalpollutionaccident,wastegas,wastewater,noise,dust,solid
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