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Catch issue with partial mpi4py installation. #21353

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Merged
deependujha merged 7 commits into from
Nov 19, 2025
Merged

Catch issue with partial mpi4py installation. #21353

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55821ca
Catch issue with partial mpi4py installation.
roccomoretti Nov 10, 2025
96f630f
update
deependujha Nov 19, 2025
79ef4ff
update
deependujha Nov 19, 2025
72624ae
Merge branch 'master' into mpi_checking
deependujha Nov 19, 2025
01524f6
Merge branch 'master' into mpi_checking
justusschock Nov 19, 2025
7194bf6
update
deependujha Nov 19, 2025
c432e9f
Merge branch 'master' into mpi_checking
deependujha Nov 19, 2025
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4 changes: 2 additions & 2 deletions src/lightning/fabric/CHANGELOG.md
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Expand Up @@ -25,13 +25,13 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).

### Fixed

- Fixed `EADDRINUSE` errors in distributed tests with port manager and retry logic ([#21309](https://github.com/Lightning-AI/pytorch-lightning/pull/21309))
- Fixed issue in detecting MPIEnvironment with partial mpi4py installation ([#21353](https://github.com/Lightning-AI/pytorch-lightning/pull/21353))

- Fixed `EADDRINUSE` errors in distributed tests with port manager and retry logic ([#21309](https://github.com/Lightning-AI/pytorch-lightning/pull/21309))

- Learning rate scheduler is stepped at the end of epoch when `on_train_batch_start` returns -1 ([#21296](https://github.com/Lightning-AI/pytorch-lightning/issues/21296)).



---

## [2.5.5] - 2025-09-05
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6 changes: 5 additions & 1 deletion src/lightning/fabric/plugins/environments/mpi.py
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Expand Up @@ -73,7 +73,11 @@ def detect() -> bool:
if not _MPI4PY_AVAILABLE:
return False

from mpi4py import MPI
try:
# mpi4py may be installed without MPI being present
from mpi4py import MPI
except ImportError:
return False

return MPI.COMM_WORLD.Get_size() > 1

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