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[WIP] ref: decoupled ddp, ddp spawn #3733
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Hello @williamFalcon! Thanks for updating this PR. There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻 Comment last updated at 2020-10-03 16:24:51 UTC |
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This pull request is now in conflict... :( |
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This pull request is now in conflict... :( |
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Merged
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This pull request is now in conflict... :( |
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maybe #3791 too? |
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Finished in #3819 |
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* ref: finish #3733 * remove deprecated test * remove deprecated test * remove deprecated test * remove deprecated test * remove deprecated test * remove deprecated test * remove deprecated test * remove deprecated test * remove deprecated test * remove deprecated test * remove deprecated test * remove deprecated test * remove deprecated test * Update pytorch_lightning/accelerators/ddp_backend.py Co-authored-by: ananthsub <ananth.subramaniam@gmail.com> * remove deprecated test * remove deprecated test * remove deprecated test Co-authored-by: ananthsub <ananth.subramaniam@gmail.com>
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Ok... turned out to fix many problems:
remove a bunch of rank_zero decorators.
We MUST make sure we don't create information asymmetry in children processes. State must be EXACTLY the same. Rank zero is there to not write to disk and that is only where it should be used.
Solved all the issues with DDP about setting VISIBLE_DEVICES and gpus indexing not working. Also solves the issues around calling fit or test or both.
Also solved the issue of how exactly to test ddp since we call other scripts. Overall we should have no regressions going forward because of these tests.
Stability of ddp has been improved dramatically!
Fixes #3422
Fixes #3117
Fixes #3730
Fixes #3605
Fixes #3403
Fixes #2826
Fixes #3071
Fixes #3023
Fixes #2913
Fixes #2590
Fixes #2529
cc @edenafek to add other tickets this fixes
Edit
PR is too big, splitting in parts.
Part 1: #3766
part 2: #3767
part 3: #3770