Raise error when eval_at is str

HideakiImamura · Sep 8, 2023 · e0f6505 · e0f6505
1 parent 80700a3
commit e0f6505
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/optuna/integration/_lightgbm_tuner/optimize.py b/optuna/integration/_lightgbm_tuner/optimize.py
@@ -132,7 +132,7 @@ def _metric_with_eval_at(self, metric: str) -> str:
         )
 
         # Optuna can handle only a single metric. Choose first one.
-        if isinstance(eval_at, Sequence):
+        if isinstance(eval_at, (list, tuple)):
             return f"{metric}@{eval_at[0]}"
         if isinstance(eval_at, int):
             return f"{metric}@{eval_at}"