How to build a 'machine learning' without any external library(tensorflow, keras, etc) for 'digital recognition'?

Question

For example in python :
Only use database library (mysql, sqlite etc) to save the result of (weight and bias) from training.

Answer 1

you might enjoy this video from Joel Grus - building a deep learning library:
https://youtu.be/o64FV-ez6Gw

Answer 2

I'll try it