diff --git a/qlib/model/ens/ensemble.py b/qlib/model/ens/ensemble.py
index 863282416..ede1f8e3a 100644
--- a/qlib/model/ens/ensemble.py
+++ b/qlib/model/ens/ensemble.py
@@ -8,6 +8,7 @@ Ensemble module can merge the objects in an Ensemble. For example, if there are
 from typing import Union
 import pandas as pd
 from qlib.utils import FLATTEN_TUPLE, flatten_dict
+from qlib.log import get_module_logger
 
 
 class Ensemble:
@@ -79,6 +80,7 @@ class RollingEnsemble(Ensemble):
     """
 
     def __call__(self, ensemble_dict: dict) -> pd.DataFrame:
+        get_module_logger("RollingEnsemble").info(f"keys in group: {list(ensemble_dict.keys())}")
         artifact_list = list(ensemble_dict.values())
         artifact_list.sort(key=lambda x: x.index.get_level_values("datetime").min())
         artifact = pd.concat(artifact_list)
@@ -121,6 +123,7 @@ class AverageEnsemble(Ensemble):
         """
         # need to flatten the nested dict
         ensemble_dict = flatten_dict(ensemble_dict, sep=FLATTEN_TUPLE)
+        get_module_logger("AverageEnsemble").info(f"keys in group: {list(ensemble_dict.keys())}")
         values = list(ensemble_dict.values())
         # NOTE: this may change the style underlying data!!!!
         # from pd.DataFrame to pd.Series