FunctionLayer

Define custom, stateless deep learning layers in MATLAB: use `functionLayer` to apply a specified function to your network input.

FunctionLayer is your direct path to custom network layers within the MATLAB Deep Learning Toolbox. It applies a specified function, assigned to the `PredictFcn` property, directly to the layer input (e.g., a novel activation function). This tool is strictly for stateless operations: layers requiring learnable parameters or internal states must use a full custom layer definition. FunctionLayer streamlines prototyping, extending the standard layer library and accelerating model development for complex tasks.

https://www.mathworks.com/help/deeplearning/ref/functionlayer.html