This repo has a very basic tutorial on Likelihood-Ratio Estimation and in addition two notebooks to explore swyft
https://colab.research.google.com/drive/1rLpW2pnhVmbEmivWSD5pzbpKTyHhbSkG?usp=drive_link – Notebook 1 https://colab.research.google.com/drive/1b-cU8QhUsyn28kOTplEgKw8pZPbIt9jZ?usp=drive_link – Notebook 2
In addition you're also free to check out the sbi tutorial