Why do I get a warning when I load a neural network object in a compiled application?

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MathWorks Support Team
MathWorks Support Team on 24 Sep 2012
Commented: Oleksii Sidorov on 25 Jul 2018
I have stored neural network objects in a MAT file and have created and compiled the following function:
function try_to_open
load my_nn_objs.mat;
Executing try_to_open inside of MATLAB works as expected. However if I compile the function using the following command:
mcc -m try_to_open.m
I get the following warning:
Warning: Class ':all:' is an unknown object class. Object '' of this
class has been converted to a structure.

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Accepted Answer

MathWorks Support Team
MathWorks Support Team on 24 Sep 2012
To make the compiler aware of the neural network objects, modify the following directive in your function:
%#function network
For example:
function try_to_open
%#function network
load my_nn_objs.mat;

More Answers (1)

Oleksii Sidorov
Oleksii Sidorov on 25 Jul 2018
I faced the same issue installing Inception-ResNet-v2,
most probably it is caused by the fact that definition of DAGNetwork contains layers which are NOT default in NN Toolbox. These "new" layers are downloaded and installed together with add-on. So, logically, without them network model has a "reference" on layers which are not exist.
I solved this issue by copying whole add-on's directory and running inceptionresnetv2.m file instead of just loading data from inceptionresnetv2.mat. In this way model is imported together with layers.
  1 Comment
Oleksii Sidorov
Oleksii Sidorov on 25 Jul 2018
You also need to copy that custom layers to your working dir, and add it to matlab path like following:
exampleFolder = genpath(fullfile(pwd));
addpath(exampleFolder)

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