Reference implementation for the paper "WaveAtom–CycleSpin: An Integrated Noise-Reduction Framework for Robust Pectoral Muscle Segmentation in Mammograms" (Ch. Sarada and G. Swetha).
as a float32 array of shape [4, H/2, W/2]. This module has no PyTorch dependency and is designed to run in DataLoader worker processes (CPU) at dataset time, exactly like A3's ``structure_tensor.py`` ...