[Update]fix bug

dummydatagen.py

@@ -156,8 +156,8 @@ def dummydf():
     #          'Tic-Tac-Toe': 0
     #          }]
     df = pd.read_csv('./assets/uc_result.csv')
-    len = len(df)
-    for i in range(len):
+    length = len(df)
+    for i in range(length):
         df.loc[i,"Method_string"]=df.loc[i, "Method"]
         df.loc[i,"Method"]=df.loc[i, "Method_string"]
     df.drop(columns=["Method_string"])