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Understanding PyTorch DistributedDataParallel (DDP) From Scratch: Why Every GPU Trains the Entire Model
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Understanding PyTorch DistributedDataParallel (DDP) From Scratch: Why Every GPU Trains the Entire Model

Athira PT
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August 2, 2026

Author(s): Athira PT Originally published on Towards AI. Understanding PyTorch DistributedDataParallel (DDP) From Scratch: Why Every GPU Trains the Entire Model Why does every GPU need its own copy of the model? How do gradients get averaged without a central master worker? …

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