How to make an artificial neural network that can multiply by 2?

Question

Neural networks

It is necessary to make a neural network that can multiply by 2 without libraries for neural networks.
How to do this if the activation function at the output can only give numbers in the range from 0 to 1?
Here's how in this article: https://habr.com/ru/post/453558/
Only in this article they use the ready-made TensorFlow library.

Answer 1

public int getValue (int a){return a * 2;}

Answer 2

Not all activation functions work within the aisles 1. ReLUhere is a bright representative.

Answer 3

We are looking for the words in the link in the question:

Let's now go back to our Celsius to Fahrenheit conversion example.

and immediately look at the diagram and read everything that is written below.