Default parameters for net.trainParam and net.trainFcn - Neural Network Toolbox

2013 5 6
2 个回答
回答已采纳
更新时间：2017 3 31
32 次查看（30 天）

1 个投票

I do not have access to the Matlab Neural Network toolbox at this time. What are the default parameters of net.trainParam and net.trainFcn if you create a network by the newff.m function, say, net = newff(feature_vector, output_vector, num_hidden_nodes), and if you train the output network with the train.m function, i.e. [net, tr, Y, E, Pf, Af] = train(net, feature_vector, output_vector)?

请先登录，再回答此问题。

 采纳的回答

Greg Heath
Greg Heath 2013-5-7

0 个投票

[inputs,targets] = simplefit_dataset;
whos
net = newff(inputs,targets,5)
% Name Size Bytes Class Attributes
% inputs 1x94 752 double
% targets 1x94 752 double
trainFcn = net.trainFcn % 'trainlm' (Levenberg-Marquardt)
mingrad = net. trainParam.min_grad % 1e-5
mu = net.trainparam.mu % 1e-3
mudec = net. trainParam.mu_dec % 0.1
muinc = net.trainparam.mu_inc % 10
mumax = net.trainParam. .mu_max % 1e10

6 个评论
显示 4更早的评论 隐藏 4更早的评论

Maxine
Maxine 2013-5-7
Thanks for the reply. Is the momentum in the ANN training represented by mu, and the minimum learning rate, mingrad? Does the training of the ANN using the train.m function in Matlab start with a high learning rate and a low momentum? Then, over time, the learning rate is decreased and the momentum is increased or appropriately adjusted?
Greg Heath
Greg Heath 2013-5-8
Google
levenberg-marquardt backpropagation wiki
levenberg-marquardt matlab
Berna Bulgurcu
Berna Bulgurcu 2013-9-29
Good question. However there is no clear answer in google and matlab text. So is it possible to reply if you know the answer, Dear Greg?
Berna Bulgurcu
Berna Bulgurcu 2013-9-29
"net.trainParam.lr" shows learning rate. However, we can not see this code in the Levenberg-Marquardt matlab codes. Why?
Greg Heath
Greg Heath 2013-9-29
The obvious reason: TRAINLM does not use a learning rate. See the references to understand how the LM algorithm works.
Berna Bulgurcu
Berna Bulgurcu 2013-9-29
http://dali.feld.cvut.cz/ucebna/matlab/toolbox/nnet/trainlm.html. This page says that default learning rate is 0.01 for TRAINLM. Thank you for your answer.

请先登录，再进行评论。

更多回答（1 个）

guirat nedjma
guirat nedjma 2017-3-31
编辑：guirat nedjma 2017-3-31

0 个投票

changement de la valeur de net.trainParam.lr sur trainrp ne fait rien changer dans mes resultat

类别

在 帮助中心 和 File Exchange 中查找有关 Deep Learning Toolbox 的更多信息

产品

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by