[python-package] fix _LGBM_CustomMetricFunction typing (#5736)

microsoft · Feb 25, 2023 · 1f828f4 · 1f828f4
1 parent 42df0ff
commit 1f828f4
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/python-package/lightgbm/engine.py b/python-package/lightgbm/engine.py
@@ -23,7 +23,7 @@
 
 _LGBM_CustomMetricFunction = Callable[
     [np.ndarray, Dataset],
-    Tuple[str, float, bool]
+    Union[Tuple[str, float, bool], List[Tuple[str, float, bool]]]
 ]
 
 _LGBM_PreprocFunction = Callable[