[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

neural_network/activation_functions/bipolar_binary_step.py

@@ -10,6 +10,7 @@
 
 import numpy as np
 
+
 def bipolar_binary_step(vector: np.ndarray) -> np.ndarray:
     """
     Implements the binary step function