NeMo-DCR ships only the ~1% of weights that change, cutting 1T cross-cluster refit from 87.5 minutes to 150 seconds
NeMo-DCR introduces a bit-exact delta refit that transfers only the weights that change per step in canonical coordinates, using fixed affine mappings to project changes directly, residual conversion to cover the rest, mixed XOR/overwrite encoding, in-place application through the serving runtime's native loader, and a recoverable joint commit; in 3% and 5% stress cases across 30B–1T models, refits are 12–40 faster than a transport-only full-checkpoint reference, and a 1T relay-tree refit takes 150 s instead of 87.5 min.