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

1f828f4e · Dmytro Tanasiuk · GitHub · 42df0ff3 · 1f828f4e
Unverified Commit 1f828f4e authored Feb 25, 2023 by Dmytro Tanasiuk Committed by GitHub Feb 24, 2023
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python-package/lightgbm/engine.py python-package/lightgbm/engine.py +1 -1

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--- a/python-package/lightgbm/engine.py
+++ b/python-package/lightgbm/engine.py
@@ -23,7 +23,7 @@ __all__ = [

 _LGBM_CustomMetricFunction = Callable[
    [np.ndarray, Dataset],
-    Tuple[str, float, bool]
+    Union[Tuple[str, float, bool], List[Tuple[str, float, bool]]]
 ]

 _LGBM_PreprocFunction = Callable[