update

Author: deependujha

src/lightning/fabric/CHANGELOG.md

@@ -25,7 +25,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Fixed
 
--
+- Fix issue with partial mpi4py installation ([#21353](https://github.com/Lightning-AI/pytorch-lightning/pull/21353))
 
 
 ---

src/lightning/fabric/plugins/environments/mpi.py

@@ -74,6 +74,7 @@ def detect() -> bool:
             return False
 
         try:
+            # mpi4py may be installed without MPI being present
             from mpi4py import MPI
         except ImportError:
             return False