PU-UNet: Stable Multiplicative Interactions for Medical Image Segmentation

PU-UNet introduces stable product-unit residual blocks into U-Net for medical image segmentation, enabling explicit multiplicative feature interactions without numerical instability. It achieves high Dice scores on ISIC 2018, Kvasir-SEG, and BUSI, outperforms a Residual U-Net baseline in Dice and IoU, and eliminates false-positive rates on normal BUSI cases.