For a detailed MATLAB implementation on building a custom Dice layer, please refer to the "Define Custom Pixel Classification Layer with Tversky Loss" documentation page:
The Tversky Loss differs from the Dice Loss by having different weights for false positives (FPs) and false negatives (FNs) in the loss function, unlike the Dice Loss which weights both FPs and FNs equally. Given the default settings in the example code in the Tversky Loss documentation page linked above, alpha=0.5 and beta=0.5, this will simplify to the Dice score. For further reference on the Tversky Loss, please consult Section 2.2 of the following publication:
