dlarray and parfor gives error

2023 8 7
1 个回答
更新时间：2023 8 9
7 次查看（30 天）

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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.

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回答（1 个）

Roman Foell
Roman Foell 2023-8-9

0 个投票

Thanks all,
I already got the answer:
Calculate the gradients inside the parfor loop and combine it outside.
Possible, because the gradient of a sum is the sum of the gradient summands.
Thanks.

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