Hack to load old distributed optimizer checkpoints #1602
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The optimizer state in
DistributedFusedAdamwas modified in #1551, making older checkpoints incompatible. Fortunately, the only differences are for buffer bookkeeping and they can be recomputed easily.This is intended as a quick workaround until we've retrained NeMo models with more recent containers. Any checkpoint handled by this PR likely doesn't have the performance optimizations from NVIDIA/NeMo#5560.