s. This is done to
mitigate “oversmoothing effect” in the enhanced denoising process.   b1 (float) — Scaling factor for stage 1 to amplify the contributions of backbone features.   b2 (float) — Scaling factor for stage 2 to amplify the contributions of backbone features.    Enables the FreeU mechanism as in https://arxiv.org/abs/2309.11497. The suffixes after the scaling factors represent the stages where they are being applied. Please refer to