isort --profile black . (#2181)

* updating DIRECTORY.md

* isort --profile black .

* Black after

* updating DIRECTORY.md

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maths/relu.py

@@ -9,9 +9,9 @@ After through ReLU, the element of the vector always 0 or real number.
 Script inspired from its corresponding Wikipedia article
 https://en.wikipedia.org/wiki/Rectifier_(neural_networks)
 """
+from typing import List
 
 import numpy as np
-from typing import List
 
 
 def relu(vector: List[float]):