fix: unnecessary imports removed

Author: cosmic-cortex

modAL/expected_error.py

@@ -2,12 +2,10 @@
 Expected error reduction framework for active learning.
 """
 
-from typing import Tuple, Callable
+from typing import Tuple
 
 import numpy as np
 
-from scipy.stats import entropy
-
 from sklearn.base import clone
 from sklearn.exceptions import NotFittedError