PyTorch DDP Explained: Gradient Synchronization for Multi-GPU Training

This article provides a deep dive into PyTorch's DistributedDataParallel (DDP) for multi-GPU training. It explains the necessity of DDP due to growing model and dataset sizes, contrasting it with model parallelism. The core of DDP is revealed to be gradient synchronization using the AllReduce operation, which averages gradients across all GPUs before they update their local model copies. This ensures all model replicas remain identical despite processing different data batches. AI

IMPACT Explains the core mechanics of distributed training, crucial for scaling large AI models.

RANK_REASON Technical explanation of a deep learning framework's distributed training mechanism. [lever_c_demoted from research: ic=1 ai=1.0]

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• data parallelism
• DistributedDataParallel
• DistributedSampler
• graphics processing unit
• ImageNet
• model parallelism
• pipeline parallelism
• PyTorch
• ResNet-50
• Tensor Parallelism

• infra

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