Revert "[examples] better PL version check (huggingface#8429)"

This reverts commit 4c7582c.

examples/lightning_base.py

@@ -4,7 +4,6 @@
 from pathlib import Path
 from typing import Any, Dict
 
-import packaging
 import pytorch_lightning as pl
 from pytorch_lightning.utilities import rank_zero_info
 
@@ -34,17 +33,15 @@
 
 logger = logging.getLogger(__name__)
 
+try:
+    pkg = "pytorch_lightning"
+    min_ver = "1.0.4"
+    pkg_resources.require(f"{pkg}>={min_ver}")
+except pkg_resources.VersionConflict:
+    logger.warning(
+        f"{pkg}>={min_ver} is required for a normal functioning of this module, but found {pkg}=={pkg_resources.get_distribution(pkg).version}. Try pip install -r examples/requirements.txt"
+    )
 
-def require_min_ver(pkg, min_ver):
-    got_ver = pkg_resources.get_distribution(pkg).version
-    if packaging.version.parse(got_ver) < packaging.version.parse(min_ver):
-        logger.warning(
-            f"{pkg}>={min_ver} is required for a normal functioning of this module, but found {pkg}=={got_ver}. "
-            "Try: pip install -r examples/requirements.txt"
-        )
-
-
-require_min_ver("pytorch_lightning", "1.0.4")
 
 MODEL_MODES = {
     "base": AutoModel,