diff --git a/learnware/learnware/utils.py b/learnware/learnware/utils.py
index b6dccd0..d5cdc14 100644
--- a/learnware/learnware/utils.py
+++ b/learnware/learnware/utils.py
@@ -47,4 +47,4 @@ def get_stat_spec_from_config(stat_spec: dict) -> BaseStatSpecification:
     if stat_spec_inst.load(stat_spec["file_name"]) is False:
         raise ValueError("Load statistic specification failed!")
 
-    return stat_spec["class_name"], stat_spec_inst
+    return stat_spec_inst.type, stat_spec_inst
diff --git a/learnware/market/easy.py b/learnware/market/easy.py
index 957efda..098887b 100644
--- a/learnware/market/easy.py
+++ b/learnware/market/easy.py
@@ -817,7 +817,9 @@ class EasyMarket(LearnwareMarket):
         learnware_list = [self.learnware_list[key] for key in self.learnware_list]
         # learnware_list = self._search_by_semantic_spec_exact(learnware_list, user_info)
         # if len(learnware_list) == 0:
+        logger.info(f"stat_info in user_info: {user_info.stat_info}")
         learnware_list = self._search_by_semantic_spec_fuzz(learnware_list, user_info)
+        logger.info(f"Number of learnwares after semantic fuzzy search: {len(learnware_list)}")
 
         if "RKMETableSpecification" not in user_info.stat_info:
             return None, learnware_list, 0.0, None
diff --git a/learnware/specification/base.py b/learnware/specification/base.py
index 1c340fa..28212d6 100644
--- a/learnware/specification/base.py
+++ b/learnware/specification/base.py
@@ -83,7 +83,7 @@ class Specification:
         or use class name as default name
         """
         for _v in args:
-            self.stat_spec[_v.__class__.__name__] = _v
+            self.stat_spec[_v.type] = _v
 
         for _k, _v in kwargs.items():
             self.stat_spec[_k] = _v
diff --git a/learnware/specification/regular/table/rkme.py b/learnware/specification/regular/table/rkme.py
index 82c81a2..17aedc1 100644
--- a/learnware/specification/regular/table/rkme.py
+++ b/learnware/specification/regular/table/rkme.py
@@ -468,7 +468,9 @@ class RKMEStatSpecification(RKMETableSpecification):
     TODO: modify all learnware in database and remove this nickname
     """
 
-    pass
+    def __init__(self, gamma: float = 0.1, cuda_idx: int = -1):
+        super(RKMEStatSpecification, self).__init__(gamma=gamma, cuda_idx=cuda_idx)
+        super(RKMETableSpecification, self).__init__(type=RKMETableSpecification.__name__)
 
 
 def setup_seed(seed):