The issue is that you are not permitted to call importONNXNetwork in a compiled application.
You have to break the code into two pieces. The first piece is not to be compiled; it loads the required network, trains it, and saves the trained network into a .mat file. The second piece is to be compiled; it loads the trained network from the .mat file and uses it to predict() or classify()
In compiled applications, you are limited to loading a trained network and using the trained network. Compiled applications cannot import networks or manipulate the layers or train networks.
