UNET++ ustilizes skip connections to exploit multi-scale features for image segmentation. it added dense skip connection adn deep supervision to the original UNET
https://arxiv.org/pdf/1912.05074.pdf

please add this network to the networks file.
official keras implementation is given in : https://github.com/MrGiovanni/UNetPlusPlus

other pytorch implemetation is also given in : https://towardsdatascience.com/biomedical-image-segmentation-unet-991d075a3a4b