Custom cost function in deep learning toolbox

Question

Sourav Sinha 2020-8-6

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/576208-custom-cost-function-in-deep-learning-toolbox

回答： Abbott Von 2020-8-12

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I want to use a custom cost function in neural network that minimizes the mean square error between

. I followed the steps mentioned here:

https://www.mathworks.com/matlabcentral/answers/461848-custom-performance-function-for-neural-networks-toolbox-using-mse-package

I created a file myfcn.m and +myfcn package.

But when I run thte code with custom cost function

net.performFcn = 'myfcn'

I get the following error:

Error using network/subsasgn>network_subsasgn (line 555)
"performFcn" cannot be set to non-existing function "myfcn".
Error in network/subsasgn (line 14)
net = network_subsasgn(net,subscripts,v,netname);
Error in SDR_exp_customfcn (line 79)
net.performFcn = 'myfcn';

I couldn't figure out what the issue is.

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Answer 1

Abbott Von 2020-8-12

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/576208-custom-cost-function-in-deep-learning-toolbox#answer_478377

https://www.mathworks.com/matlabcentral/answers/461848-custom-performance-function-for-neural-networks-toolbox-using-mse-package

Well， maybe this tutorial can help you. The key is that line "Defining custom functions with this approach works only with the non-MEX version of the Neural Network code, so it is necessary to call 'train' using the 'nn7' option."

net = train(net,x,t,nn7);

y = net(x,nn7);