Fix compare version for packages (#10762)

CHANGELOG.md

@@ -199,6 +199,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Fixed the `{validation,test}_step` outputs getting moved to CPU with `Trainer(move_metrics_to_cpu=True)` ([#10631](https://github.com/PyTorchLightning/pytorch-lightning/pull/10631))
 
 
+- Fixed `_compare_version` for python packages ([#10762](https://github.com/PyTorchLightning/pytorch-lightning/pull/10762))
+
 
 ## [1.5.2] - 2021-11-16
 

pytorch_lightning/utilities/imports.py

@@ -58,7 +58,7 @@ def _compare_version(package: str, op: Callable, version: str, use_base_version:
             pkg_version = Version(pkg.__version__)
         else:
             # try pkg_resources to infer version
-            pkg_version = Version(pkg_resources.get_distribution(pkg).version)
+            pkg_version = Version(pkg_resources.get_distribution(package).version)
     except TypeError:
         # this is mocked by Sphinx, so it should return True to generate all summaries
         return True