Accelerated TGD

A-TGD generally improved perceptual quality and structural similarity relative to DAPS and DPS under matched-runtime image reconstruction. A smaller pruning fraction reduces cost, while a larger fraction makes A-TGD closer to full TGD. A-TGD runs full particle TGD for a fraction of outer stages, then keeps the best particle by likelihood or measurement error and finishes as one trajectory. Accelerated TGD is designed as a reconstruction-oriented variant for expensive image inverse problems. A-TGD is intended for single reconstruction under a fixed budget rather than posterior sampling.