The definitions of sigmoid_focal_loss and dice_loss not found in model/detector.py

Hi,

When I read your code, I found "Unresolved reference 'sigmoid_focal_loss' and Unresolved reference 'dice_loss' " in 'model/detector.py' file, and I could not find any code related to these two functions. May I ask if you forget to upload the definitions of the two functions?

Looking forward to your reply.