Kako napraviti neuronsku mrežu u Pythonu

Kako napraviti jednostavnu neuronsku mrežu koristeći Python?
https://medium.com/technology-invention-and-more/how-to-build-a-simple-neural-network-in-9-lines-of-python-code-cc8f23647ca1

https://medium.com/analytics-vidhya/demystifying-neural-networks-a-mathematical-approach-part-1-4e10bed61400