chore: update class name _chain to avoid sphinx warning

chalmerlowe · chalmerlowe · commit cb768d49588a · 2026-04-01T12:38:39.000-04:00
diff --git a/packages/bigframes/bigframes/ml/model_selection.py b/packages/bigframes/bigframes/ml/model_selection.py
@@ -19,7 +19,6 @@
 import inspect
 import time
 import typing
-from itertools import chain
 from itertools import chain as _chain
 from typing import Generator, List, Optional, Union
 
