dlarray and parfor gives error

Question

Roman Foell 2023-8-7

0
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https://ww2.mathworks.cn/matlabcentral/answers/2005772-dlarray-and-parfor-gives-error

回答： Roman Foell 2023-8-9

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Hello together,

I want to accelerate my compuations with parfor while using dlarray.

My compuation looks like this:

parfor i = 1:num_features
    feature = ... some calculations ...   
    loss_temp(i) = mse(feature,feature_ground_truth,'DataFormat','CB')
end
loss = sum(loss_temp);
  
gradients = dlgradient(loss,dlnet.Learnables); 

It gives me the error:

Error using dlarray/dlgradient

Value to differentiate is not traced. It must be a traced real dlarray scalar. Use dlgradient inside a function called by dlfeval to trace the variables.

Error in modelGradients (line 67)

gradients = dlgradient(loss,dlnet.Learnables);

Does this mean, dlarray information is lost during parfor calculation and it is not compatible with it?

Thanks for your help.

Edit:

There is a website Link. Do I have to use dlaccelerate somehow? Thanks.