bug fix

cdplib/ml_validation/fine_tuning.py

@@ -15,8 +15,7 @@ import numpy as np
 if (sys.version_info.major == 3) & (sys.version_info.minor >= 8):
     from typing import Iterable, Callable
 else:
-    from 
-     import * #Iterable, Callable
+    from typing_extensions import * #Iterable, Callable
 
 
 def get_optimal_proba_threshold(score_func: Callable,