【发布时间】：2012-05-29 16:52:52
【问题描述】：
我已经为鼠标手势识别制作了简单的神经网络（输入是角度），并且我使用了 nprtool（用于创建的函数 patternnet）。我保存了网络的权重和偏差：
W1=net.IW{1,1};
W2=net.LW{2,1};
b1=net.b{1,1};
b2=net.b{2,1};
为了计算结果，我使用了tansig(W2*(tansig(W1*in+b1))+b2);
其中in 是一个输入。但结果很糟糕（每个数字大约等于 0.99）。推荐 net(in) 的输出很好。我究竟做错了什么 ？为什么第一种方法不好（在我的 C++ 程序中也是如此）对我来说非常重要。我正在寻求帮助:)
[编辑]
下面是nprtool GUI 生成的代码。也许对某人来说这会有所帮助，但我没有从这段代码中看到我的问题的任何解决方案。隐藏层和输出层神经元使用tansig激活函数（MATLAB网络中有参数吗？）。
% Solve a Pattern Recognition Problem with a Neural Network
% Script generated by NPRTOOL
% Created Tue May 22 22:05:57 CEST 2012
%
% This script assumes these variables are defined:
%
% input - input data.
% target - target data.
inputs = input;
targets = target;
% Create a Pattern Recognition Network
hiddenLayerSize = 10;
net = patternnet(hiddenLayerSize);
% Choose Input and Output Pre/Post-Processing Functions
% For a list of all processing functions type: help nnprocess
net.inputs{1}.processFcns = {'removeconstantrows','mapminmax'};
net.outputs{2}.processFcns = {'removeconstantrows','mapminmax'};
% Setup Division of Data for Training, Validation, Testing
% For a list of all data division functions type: help nndivide
net.divideFcn = 'dividerand'; % Divide data randomly
net.divideMode = 'sample'; % Divide up every sample
net.divideParam.trainRatio = 70/100;
net.divideParam.valRatio = 15/100;
net.divideParam.testRatio = 15/100;
% For help on training function 'trainlm' type: help trainlm
% For a list of all training functions type: help nntrain
net.trainFcn = 'trainlm'; % Levenberg-Marquardt
% Choose a Performance Function
% For a list of all performance functions type: help nnperformance
net.performFcn = 'mse'; % Mean squared error
% Choose Plot Functions
% For a list of all plot functions type: help nnplot
net.plotFcns = {'plotperform','plottrainstate','ploterrhist', ...
'plotregression', 'plotfit'};
% Train the Network
[net,tr] = train(net,inputs,targets);
% Test the Network
outputs = net(inputs);
errors = gsubtract(targets,outputs);
performance = perform(net,targets,outputs)
% Recalculate Training, Validation and Test Performance
trainTargets = targets .* tr.trainMask{1};
valTargets = targets .* tr.valMask{1};
testTargets = targets .* tr.testMask{1};
trainPerformance = perform(net,trainTargets,outputs)
valPerformance = perform(net,valTargets,outputs)
testPerformance = perform(net,testTargets,outputs)
% View the Network
view(net)
% Plots
% Uncomment these lines to enable various plots.
%figure, plotperform(tr)
%figure, plottrainstate(tr)
%figure, plotconfusion(targets,outputs)
%figure, ploterrhist(errors)
【问题讨论】：
-
请包含创建
net的代码，我们无法猜测您使用了哪些参数。不必猜测是什么函数创建了它也很好（network?） -
我在一分钟前完成了这个。我将非常感谢您的帮助:)
标签： matlab neural-network