清空筛选条件
清空筛选条件

perform command in neural netwrok

1 次查看（过去 30 天）
Tala Hed
Tala Hed 2017-7-17
回答： Greg Heath 2017-7-18
I cant understand how perform function works in neural network! at the end of this page in section 5: https://www.mathworks.com/help/nnet/gs/classify-patterns-with-a-neural-network.html?requestedDomain=www.mathworks.com the performance is calculated but without any explanation! what does it mean? is it a good network? In other examples the performance value is 19! which one is better?
  1 个评论
Greg Heath
Greg Heath 2017-7-18
Ahhh. An ally in dismay !
https://www.mathworks.com/matlabcentral/newsreader/view_thread/349050#955175
Searching the NEWSGROUP using the search word 'QUICKIE' find
http://www.mathworks.com/matlabcentral/newsreader/view_thread/348883#955252.
Compare those results with perform.
Hope this helps.
Greg

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Greg Heath
Greg Heath 2017-7-18
help perform
doc perform
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
net = patternnet;
performFcn = net.performFcn
% performFcn = 'crossentropy' AHA!
help crossentropy
doc crossentropy
% Still isn't clear? ... Join the club. I used to know what crossentropy was. However, when I gave technical talks (I'm an engineer, not a physicist) no one else knew or cared. What they wanted was error rates and Rsquare.
My preferences are
NORMALIZED MEAN SQUARE ERROR NMSE = 1-Rsquare %[ 0,1]
and
PER CENT ERROR RATE % [ 0, 100]
See my QUICKIES post
Hope this helps.
Thank you for formally accepting my answer
Greg
PS If you are a glutten for punishment, see GOOGLE
greg MATLAB crossentropy ==> 39,500 hits (;>)
otherwise see
HITS
NEWSGROUP ANSWERS
crossentropy 28 62
crossentropy greg 6 46
Hope this helps.
Thank you for formally accepting my answer
Greg

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Deep Learning Toolbox 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by