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How to change the default loss function from "crossentropyex" to "crossentropy" using the pixelClassificationLayer in MATLAB?

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The properties of the pixelClassificationLayer include the LossFunction "crossentropyex" by default. When I attempted to change it as shown below:
SegLayer = pixelClassificationLayer('LossFunction', 'crossentropy');
I encountered the following error:
Error using nnet.cnn.layer.PixelClassificationLayer.parseInputs 'LossFunction' is not a recognized parameter.
Could you please demonstrate how to modify the default loss function? I am using the Unet model for semantic segmentation, and I want to switch from "crossentropyex" to "crossentropy" because the former is only suitable for mutually exclusive scenarios.
Thank you!

Accepted Answer

Malay Agarwal
Malay Agarwal on 13 Jul 2023
Edited: Malay Agarwal on 13 Jul 2023
Unfortunately, the LossFunction property of the pixelClassificationLayer is read-only and cannot be changed. What you can do instead is create a custom pixel classification layer, as demonstrated here: Define Custom Pixel Classification Layer with Tversky Loss - MATLAB & Simulink - MathWorks India. The example demonstrates how to use the Tversky loss but it shouldn't be too difficult to adapt the example to use the crossentropy loss. Please make sure you use functions supported by dlarray to make use of automatic differentiation.

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