Fix numpy deprecation warning in `2_hidden_layers_neural_network.py` (#10424)

* updating DIRECTORY.md

* updating DIRECTORY.md

* updating DIRECTORY.md

* updating DIRECTORY.md

* Fix deprecation warning in 2_hidden_layers_neural_network.py

Fix numpy deprecation warning:
DeprecationWarning: Conversion of an array with ndim > 0 to a scalar is deprecated, and will error in future. Ensure you extract a single element from your array before performing this operation. (Deprecated NumPy 1.25.)

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