Fixes a bug that causes CSVLogger to overwrite version_0 when root_dir is a relative path.

src/lightning/fabric/loggers/csv_logs.py

@@ -158,9 +158,10 @@ def _get_next_version(self) -> int:
  return 0
 
  existing_versions = []
- for d in self._fs.listdir(root_dir, detail=False):
- name = d[len(root_dir) + 1 :] # removes parent directories
- if self._fs.isdir(d) and name.startswith("version_"):
+ for d in self._fs.listdir(root_dir):
+ full_path = d["name"]
+ name = os.path.basename(full_path)
+ if self._fs.isdir(full_path) and name.startswith("version_"):
  existing_versions.append(int(name.split("_")[1]))
 
  if len(existing_versions) == 0: