pytorch/examples

DDP training question

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#1,096 opened on Nov 25, 2022

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Description

Hi, I'm using the tutorial https://github.com/pytorch/tutorials/blob/master/intermediate_source/ddp_tutorial.rst for DDP train,using 4 gpus in myself code, reference Basic Use Case. But when I finished the modification, it was stuck during run the demo,meanwhile,video memory has been occupied.Could you help me?

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Research direction
Review the DDP tutorial for basic setup, verify NCCL backend availability, and check for common hang causes like missing synchronization barriers or incorrect rank assignment. Also, ensure that all processes are initialized properly with torch.distributed.init process group.
Tech stack
pythonpytorch
Domain
backendmachine learning
Issue type
Research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
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Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Needs investigation
Prerequisites
PythonPyTorchDistributed computing
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30