Lightning-AI/pytorch-lightning

Support uneven DDP inputs with pytorch model.join

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#3,325 opened on Sep 2, 2020

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 (27 comments) (13 reactions) (0 assignees)Python (3,233 forks)batch import
3rd partydistributedfeaturehelp wanted

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Description

See more details: https://github.com/pytorch/pytorch/issues/38174

cc @borda @tchaton @rohitgr7 @akihironitta @awaelchli

Contributor guide

Research direction
Read the referenced PyTorch issue (https://github.com/pytorch/pytorch/issues/38174) to understand the model.join API. Examine how uneven inputs are handled in PyTorch Lightning's DDP integration. Look for existing discussions or partial implementations in the codebase. Consider what changes are needed to support uneven inputs (e.g., padding, gradient synchronization adjustments).
Tech stack
pythonpytorch
Domain
machine learningdistributed systems
Issue type
Feature
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.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Needs investigation
Prerequisites
PythonPyTorchDistributed training concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25